Dissertations / Theses on the topic 'Cognitive-behavioural factors'

The current paradigm on cognitive ageing suggests that greater social participation, higher socioeconomic status, as well as more physical and mental exercise, have a positive effect on cognitive decline trajectories with ageing. In turn, favourable cognitive decline trajectories with ageing lead to better outcomes in terms of everyday functioning. Although this paradigm has received significant recognition in research and policymaking, it has been insufficiently examined among cognitively healthy older adults. This research set out to examine explicitly among cognitively healthy older adults, whether higher social participation, higher socioeconomic status, as well as more physical exercise and Internet use have a beneficial effect on cognitive vitality and everyday functioning. Firstly, a meta-analysis of studies that examined the relationship between cognitive performance and everyday functioning among healthy older adults was conducted. Subsequently, the translation and cultural validation of two measures of everyday functioning from English to Greek was carried out. Lastly, a cross-sectional study that examined the relationship between social participation, socioeconomic status, physical exercise, Internet, cognitive performance and everyday functioning was conducted. The findings indicate that cognitive performance and everyday functioning are moderately related in the healthy spectrum of cognitive performance. Furthermore, social participation, education, Internet use and exercise seem to moderate age-related decrements in cognitive performance. These effects seem to be contingent upon certain age groups and subpopulations with specific characteristics. The findings do not support the transferability of cognitive benefits to everyday functioning. It was concluded that social participation, Internet use and exercise might have a significant beneficial effect on at least one domain of cognitive performance (executive function) in older adults with specific characteristics, without resulting necessarily in everyday functioning benefits.

Computerised Cognitive Behavioural Therapy (CCBT) has been recommended for patients in the National Health Service (NHS) Primary Care across the United Kingdom for management of mild to moderate anxiety and depression. This approach also promises financial savings, and may fill the gap between demand and supply of face-to-face therapy. Studies have shown that CCBT is feasible and effective. However, dropout rates can be as high as 86%, but the reasons remain unclear and the information available is limited. This thesis explores factors that may impact on the usability and user experience of this computer-mediated therapy. Espousing the “real world” research philosophy and widely used methods in the Human-Computer Interaction (HCI) field for usability evaluations, four studies using a mixed-methods design were conducted. Study I was an online usability survey, which investigated if usability evaluations had been conducted for CCBT applications. Two versions of questionnaires were sent to four CCBT software developers and ten authors of randomised controlled trials. The categories and responses of the questionnaires gathered from five respondents were reviewed and summarised. The findings suggested that usability evaluations for CCBT were still in their infancy when compared to other healthcare interventions to which HCI approaches have been widely applied. Study II was a usability Heuristic Evaluation (HE) conducted with four expert evaluators to assess two different CCBT applications’ interfaces (MoodGYM and Living Life to the Full) against the self-designed usability heuristics for their compliance. The findings revealed numerous usability issues. Major problems related to navigation and inconsistency of the interfaces were identified. These could be rectified to enhance the user experience. Study III focused on other factors besides usability that might have an influence on the effective use of CCBT. Perceptions of service providers who were involved in both decision-making about CCBT availability and supporting its use were gathered. Nine service providers at different NHS organisations were interviewed. The interviews were analysed using techniques from Grounded Theory (GT). The findings suggested that the practitioners’ attitudes towards CCBT might have affected its service delivery. Four categories from the data analysis were identified: (1) shaping behaviour, (2) implementing and delivering, (3) making an appropriate referral, and (4) technology/CCBT packages - advancing with time. A conceptual model was also generated, “building support around CCBT”: a road-map that could address some of these issues. Study IV examined patients’ perceptions and acceptance of a CCBT application (Beating the Blues), its usability and the user experience, and also whether the user characteristics (e.g. computer experience (CE) and computer self-efficacy (CSE)) had any influence on patients’ use of this technology. A mixed-methods approach was utilised with a sample of 33 participants. Face-to-face and email interviews were conducted. Feedback was also gathered from a usability questionnaire and think-aloud protocol with seven participants selected from the sample. The data were analysed using Thematic and Saliency Analysis to uncover themes. Descriptive statistics were used to describe data from questionnaires. Two overarching themes from the interviews were identified: (1) access to CCBT services, and (2) perceptions and attitudes towards CCBT. Both themes revealed issues which might have significantly impacted on patients’ engagement with CCBT. Numerous flaws were also discovered in the application’s design and functionality (e.g. navigation, aesthetics, relevance of content, and inflexibility). However, the results from CE and CSE questionnaires suggested that participants were confident in using this technology. The four studies provided an in-depth understanding of factors that affect the usability and user experience of CCBT and possible reasons for the high attrition rates. The implications of this research point to the need for health policymakers to focus on the current implementation issues and on how best to deploy this treatment therapy to patients. Further development of CCBT is pivotal to its success, in particular, expanding contexts of use and increasing usability evaluations. Keeping users interested and engaged will improve treatment efficiency, completion rates and will achieve better clinical outcomes.

The study investigated which client, therapist, and therapy characteristics were associated with the quality of the therapeutic relationship in Cognitive-Behavioural therapy (CBT) for psychosis. The development of a good therapeutic relationship is essential to the work of CBT for psychosis but is often more difficult to achieve due to the nature of psychotic symptoms. Despite this, there has been little research investigating what affects the development of the therapeutic relationship within CBT for psychosis. The study had a cross-sectional, correlational design with measures taken at around the sixth session of therapy. Clients and therapists completed questionnaires measuring client, therapist, and therapy factors, and their perceptions of the therapeutic relationship. On average, both clients and therapists rated the therapeutic relationship as good. Although there was a trend towards agreement on the quality of the therapeutic relationship, on average clients rated it higher than therapists. There were few significant effects of client or therapist factors on the therapeutic relationship, including some unexpected negative results, e.g. no effect for psychotic symptoms. There were some significant effects for therapy factors and clients reports of the therapeutic relationship, e.g. the presentation of a case formulation.

The aim of this thesis is to develop a better understanding of the factors influencing children’s reading skill and reading development. In particular, the experimental studies were designed to investigate the influence of cognitive skills, motivational factors, and behavioural factors on children’s reading attainment. The results illustrate that both cognitive and non-cognitive factors (i.e. motivation and behaviour) influence children’s reading skill. The studies also show that the relationship between motivation and reading attainment is domain specific. Furthermore, considering a multi-dimensional approach to reading motivation, the results suggest that whilst intrinsic reading motivation and reading competency beliefs are generally associated with children’s reading skill, extrinsic motivation is unrelated. In addition, the predictors of children’s motivation to read were examined. The results suggest that children’s motivation to read is shaped by their reading competency beliefs and personality characteristics (particularly openness to experiences). Regarding behavioural factors, of all the classroom behaviours assessed, hyperactive/inattentive behaviour was found to be most closely associated with children’s reading skills. In addition, hyperactive/inattentive behaviour was associated with children’s emergent reading-related abilities. Finally, the studies examined the cognitive skills that support reading development when children are taught to read by a synthetic phonics approach. It was found that early word reading skill was largely underpinned by children’s letter sound knowledge, phoneme awareness (particularly phoneme synthesis), and verbal short term memory. These skills are consistent with the idea that the way in which children are taught to read influences the cognitive skills underpinning reading.

Objectives: Computer-guided CBT could help to increase much needed access to lowintensity psychological interventions. Evidence for effectiveness has led to the inclusion of certain packages in NICE guidelines but application in clinical settings is unclear. Low uptake and high dropout suggest problems with acceptability and barriers to uptake. Studies neglect to report on acceptability to clinicians despite indications that clinicianrelated variables and attitudes could influence their use of CCBT. This study investigates clinicians‟ views of CCBT and factors related to referring to it, following experience of low referrals to a CCBT pilot, with the aim of learning more about barriers to access and how this might be improved. Method: A mixed quantitative and qualitative design was used. An online survey was developed to gather views on CCBT, its implementation and demographic information. This was sent to a sample of clinicians in the clinical psychology department, mental health nurses and general practitioners, some of whom were involved in the CCBT pilot project and some not. Descriptive statistics, non-parametric correlations, chi-squared analyses and framework thematic analysis was carried out on 72 completed surveys. Results: Most clinicians identified both benefits and concerns of CCBT. Most approved of CCBT but likelihood to refer varied and many preferred to offer other interventions. Clinician-related variables associated with likelihood to refer were whether clinicians saw mild to moderate cases, approval of CCBT and perceived patient uptake. Views regarding the effectiveness of CCBT influenced choices to offer it, with negative beliefs about effectiveness including a perceived need for human contact. There was moderate interest in receiving CCBT training. Most thought it should be accessed widely, with some concern raised about access in public settings. Although GPs were not involved in the CCBT pilot, many expressed interest in receiving training and referring. Conclusions: Clinicians‟ views of CCBT are mixed and some believe it is ineffective and unacceptable to patients, which influences their decisions to offer it. This includes perceptions about key aspects of therapy, such as human contact. Therefore some clinicians need more convincing of the CCBT evidence-base before they are likely to refer to it. Nevertheless there is moderate interest in using CCBT and more so in those seeing mild to moderate cases. CCBT may have a position in stepped care services but views of referrers should be considered and training offered. More research is needed on implementing CCBT, barriers to access and its role alongside other interventions.

Background: Group CBT approaches have been shown to be equally as effective as individual CBT for reducing depressive symptoms and preventing relapse; however, the predictors of response are poorly understood. The primary objective of the studies presented in this thesis was to further examine the formal and process factors within group CBT for depression that contribute to various treatment outcomes. The first study investigated the relationship between group CBT for depression and changes in interpersonal distress, as well as the process mechanisms that might influence this relationship. The second study assessed whether formal feedback provided to therapists and clients derived from the Outcome Questionnaire (OQ-45), a robust measure of client functioning, would enhance group processes and treatment outcomes. Method: Study 1: Secondary data from clients having received individual CBT for depression at a community-based mental health training centre constituted one condition (18 clients). Data for the group condition (12 clients) were collected from clients attending group CBT for depression at a tertiary care facility. Relationship distress, as measured by the OQ-45 relationship distress subscale score, was assessed at intake and termination. Group participants also completed process measures at the start and end of treatment. In study 2, participants were recruited from a tertiary care facility to participate in a CBT group for depression. Participation involved completing brief questionnaires assessing psychological and process variables before and after treatment, as well as the OQ-45 at every session. Three groups (21 clients) received standard CBT and two groups (12 clients) received enhanced CBT, which included feedback about their progress from the OQ-45. Results: Results of study 1 suggest that clients who participated in group CBT experienced a significantly greater reduction in relationship distress across time than clients who participated in individual CBT. Results also indicate that therapeutic alliance, and not group cohesion, mediates the relationship between pretreatment relationship distress on posttreatment relationship distress in group CBT. Results of study 2 indicate that participants in the enhanced condition experienced greater improvements in quality of life, dysfunctional beliefs, and therapeutic bond at termination, relative to participants in the standard condition. Trends also suggest a greater reduction in depressive symptoms. Conclusions: Group CBT for depression may be more effective than the individual modality for reducing interpersonal distress. Furthermore, therapeutic alliance plays a significant role in improving interpersonal distress within a structured group CBT protocol. Feedback from the OQ-45 may help improve client outcomes and enhance therapeutic bonding with facilitators in group CBT for depression.

This thesis is presented in two volumes. In Volume I, the effectiveness of cognitive-behavioural therapy and graded exercise therapy in the management of chronic fatigue are reviewed. The impact of these treatments compared to no treatment and other active therapy is assessed using meta-analytic techniques. The findings indicate that both cognitive-behavioural therapy and graded exercise therapy are effective in reducing fatigue and increasing physical functioning in the short term. Neither approach significantly improved mood disturbance. The findings are discussed with reference to treatment models for chronic fatigue and future research directions are identified. The second paper in Volume I presents an empirical study examining information processing in chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME). Individuals with CFS/ME, rheumatoid arthritis and healthy controls completed measures of core schema and current mood, in addition to an emotional Stroop task and facial affect recognition task. Stronger core schema were reported by the CFS/ME group. The illness groups both displayed systematic biases in their processing of emotional information. The findings are interpreted with reference to cognitive models of CFS/ME. Volume II contains five individual clinical practice reports completed during Forensic, Child, Older Adult and Learning Disability placements respectively.

Recreational screen time activities (e.g., computer use, television viewing, and videogame engagement) have become increasingly embedded in modern day culture, posing both physical and psychological health consequences (Babic et al., 2017; Goldfield et al., 2013). Despite the established link between recreational screen time and adolescent depressive symptomatology, little is known about mechanisms that may explain or influence this relationship. The overarching objective of the present dissertation, which includes two separate studies, was to examine cognitive, behavioural, affective, and interpersonal factors associated with the relationship between adolescents’ total daily recreational screen time activities and depressive symptomatology over time. The dissertation includes archival data from the Research on Eating and Adolescent Lifestyle (REAL) Study, which examined a large sample of students from the National Capital Region of Canada. Both Study 1 and Study 2 examined a subsample of these students. Given that exposure to screen time occupies up to 10 hours of Canadian children and adolescents’ waking hours (Active Healthy Kids Canada, 2013; Leatherdale & Ahmed, 2011; Leatherdale & Harvey, 2015), the independent variable examined in the model was total daily recreational screen time activities. Because trajectories of depressive symptomatology typically increase during adolescence (Duchesne & Ratelle, 2014), the dependent variable examined in the model was depressive symptomatology. The time points spanned over 7 years. The purpose of Study 1 was to test a prospective longitudinal path analysis model. The model examined the relationship between total daily recreational screen time at baseline (T0) and depressive symptomatology at Time 4 (T4), with body image and disordered eating behaviours at Time 2 (T2) as potential mediating variables. The final sample included 304 English-speaking students (194 females, Mage = 13.40 years, SD = 1.10). Total daily recreational screen time at T0 was significantly predictive of depressive symptomatology at T4. Appearance (dis)satisfaction at T2 mediated the relationship between total daily recreational screen time at T0 and depressive symptomatology at T4. Total daily recreational screen time at T0 was significantly predictive of emotional eating and decreased body image satisfaction at T2. Restrained eating and appearance satisfaction were negatively associated with depressive symptomatology at T4. Results were independent of age and depressive symptomatology at T0. The purpose of Study 2 was to test a longitudinal moderation model including total daily recreational screen time at T0 and depressive symptomatology at T4, with attachment style, coping style, and perceived social support at T0 as potential moderating variables. The final sample included 170 English-speaking students (106 females; Mage = 13.01, SD = 0.96). Contrary to expectation, attachment style, coping style, and perceived social support did not moderate the relationship between total daily recreational screen time at T0 and depressive symptomatology at T4. However, insecure attachment was identified as a risk factor for depressive symptomatology among males. A trend emerged in that avoidance-oriented coping appeared to be a risk factor for depressive symptomatology among females and a protective factor for males. There was also a three-way interaction between total daily recreational screen time, gender, and perceived social support. That is, when perceived social support was high, higher levels of total daily recreational screen time at T0 was associated with higher levels of depressive symptomatology at T4 for both males and females, but the relationship was significant for males only. Findings from the present dissertation offer important theoretical, methodological, and clinical implications.

Whether it is the accumulation of capital or capabilities that accounts for rapid development of Newly Industrialized Countries (NICs) has been a focus of debate. The former, which informs approaches to development often adopted by international agencies, reflects neoclassical perspectives. The later, by contrast, reflects evolutionary approaches with deliberate learning and innovation as dominant factors. The purpose of this thesis is to understand development by exploring how it is influenced by learning and innovation focusing on the factors, mechanisms and institutional conditions that foster learning and innovation in Malawi. This thesis has adopted quantitative and qualitative methods informed extensively by theoretical perspectives on the knowledge, learning, innovation and development nexus. Using primary survey and secondary data, a conceptual framework that emerged from contrasting perspectives on theories of the firm has situated a quantitative understanding of how firms in Malawi learn and innovate and the impact of institutional conditions. A qualitative approach, however, has enabled identification of underlying mechanisms that foster learning and innovation thus, providing bases for articulating how evolutionary perspectives can enhance Malawi's development prospects. The thesis finds that successful development is conditioned on understanding it as an interactive process of learning and innovation hinged on addressing systemic failure regarding acquisition and utilization of knowledge by producers, firms especially. We find that failures related to institutional conditions on market and social capabilities, governance and communication and knowledge infrastructure have created a business environment in Malawi that does not foster firm learning and innovation. Thus, firms are more inclined to exploiting existing capabilities leading to static rather than dynamic efficiency. This behaviour reflects dominance of neoclassical perspective of development by stakeholders. We find, therefore, that Malawi's development prospects are predicated on innovation in the delivery of knowledge-related services to producers thus, innovation in public goods. At firm-level, action that: promotes firms' investment in on-the-job training, engenders dialogue, fosters collaboration; and builds knowledge stock positively influences learning and innovation capability. We find that high learning firms, under entrepreneurial leadership, exemplify an evolutionary understanding of the role of knowledge in production. They deliberately foster these behavioural and cognitive factors for which they are rewarded with superior performance. At national level, we find that contrary to neoclassical perspectives, Malawi's development is conditioned on purposive action by all stakeholders, government in particular, to mitigate constraints on learning and innovation arising from idiosyncratic aspects of the business environment. This evolutionary perspective entails entrepreneurial leadership in government and adoption of a national learning and innovation system approach to development. We argue that building coalitions focused on fostering knowledge flows to firms, especially those in the manufacturing sector which we find to be the basis for structural change of the economy, is a necessary though not sufficient pre-condition for Malawi's development.

Psoriasis is a chronic autoimmune skin condition that can impair psychological, social, and physical functioning. The psychological implications of psoriasis can be highly disturbing and a significant number of patients with psoriasis live with considerable and enduring psychological distress. An accumulating body of evidence suggests that Cognitive Behavioural Therapy (CBT) may be the most effective in ameliorating the psychological distress resulting from living with psoriasis. CBT has been effective in reducing the emotional distress, the quality of life impairment associated with psoriasis and as a result the clinical severity of it. The mechanisms behind these changes are not known, however. Outcome studies in CBT have shown that common factors (i.e., therapeutic relationship) and/or technical ones (i.e., CBT techniques) account for therapeutic change. The aim of this study is to identify the factors that influence the treatment process and the outcome of CBT for individuals with psoriasis and develop a model of it. This study adopted a constructivist Grounded Theory approach. In-depth semi-structured interviews were conducted with nine patients who had completed a course of CBT within the Psychodermatology Clinic of a hospital in England. From the analysis emerged the model of “Guided Therapeutic Growth” which was the core conceptual framework that subsumed the factors that influence the patients’ experiences of their therapeutic processes in CBT. These factors were: (a) “feeling engaged with the therapeutic process”; (b) “establishing a trusting therapeutic relationship”; (c) “legitimising the expression of distress associated with psoriasis”; and (d) “guided cognitive restructuring of the meanings attached to psoriasis”. The integration of these four interrelated factors forms a tentative model that was found to impact the therapeutic growth by reducing distress, alleviating emotional pain and helping individuals with psoriasis to become more self-compassionate, all of which were found to motivate and empower them to move forward and achieve positive changes in their adjustment to their psoriasis. Conversely, the absence of these factors or the presence of certain hindering conditions could compromise the therapeutic experience of CBT and jeopardise progress. In this context, the following hindering conditions were reported: (a) negative preconceived notions about homework; (b) too much or too little directiveness by the therapist; and (c) externalisation process of emotional release experienced by the patient as too revealing.

Introduction: Factors have been identified in association with the psychological adjustment of children and adolescents with Type 1 diabetes such as metabolic control (McDonnell et al., 2007), maternal functioning (Schmidt, 2007) and protective parenting (Mullins et al., 2004). Parenting factors may have an impact on young children (Whittemore et al., 2003; Davis et al., 2001); while other factors such as self-efficacy are important to adolescent patients (Littlefield et al., 1992) as responsibility for diabetes management is gradually transferred from parent to child (Palmer et al., 2004). Many studies have examined family and peer support in the context of adolescents’ capacity to cope with their diabetes (La Greca & Bearman, 2002; Lewandowski & Drotar, 2007), but few have demonstrated the link between diabetes-specific factors for adolescent patients and psychological adjustment in their mothers (Berg et al., 2007). The number of studies on very young patients with Type 1 diabetes is also limited (Grey et al. 1995) in spite of the doubling of incidence of diabetes in children under five years of age in Australia (Taplin et al., 2005). Objective: To examine the child, adolescent and parental factors associated with psychological adjustment and health status in children and adolescents with Type 1 diabetes and their mothers over a post-diagnosis period of 12 months.Method: Sixty-two families of young patients from birth to 18 years of age completed standard measures in a longitudinal analysis on psychological and diabetes-specific variables. Data included child/adolescent measures of adjustment, self-report measures of maternal psychological adjustment, parental protectiveness, maternal separation anxiety, adolescent quality of life, self-efficacy and medical records of metabolic control at the first time point following diagnosis, and repeated at the second time point 12 months post-diagnosis. Results: Increased psychological symptoms in mothers were mildly associated with poor child/adolescent adjustment following diagnosis, and then moderately associated 12 months post-diagnosis. Metabolic control was adequate, although levels declined over time, and adolescent metabolic control was predicted by both maternal and adolescent adjustment. In a separate test, maternal and adolescent adjustment and self-efficacy were associated with quality of life for adolescents. Relatively high levels of maternal separation anxiety and protectiveness were shown; however they were not associated with the other variables. Conclusions: This study highlights the role of mothers in the adjustment of children and adolescents with Type 1 diabetes and the potential risk to the adjustment of a significant minority of young patients and their mothers over time. The influence of maternal adjustment to quality of life and diabetes health status of adolescents was emphasised. Support for families in the first year after diagnosis is indicated.

Daily use of inhaled preventer medication is recommended for most people with asthma. However, research suggests many do not adhere to this regime. The current thesis comprises two research studies utilising the common-sense model of self-regulation as the theoretical basis to explore how people make decisions about inhaled preventer use in asthma. The purpose of Study One was to compare a self-report and an objective measure of adherence to preventer medication for asthma and to examine the illness representations and treatment beliefs associated with these measures. Accordingly, 1,936 U.K. General Practice patients who were using preventer medication for asthma completed a questionnaire assessing illness and medication perceptions and gave consent for information to be obtained from their medical records. Adherence to preventer medication was calculated from the Medication Adherence Report Scale (MARS) and an objective measure, the proportion of prescribed medication that the participant collected over the previous year. Results show that nearly nine out of ten participants (88.4%) reported some non-adherence to their preventer medication. The most common form of non-adherence was using preventer inhaler only when feeling breathless. The relationships between participants’ representations of their asthma and their beliefs about their preventer medication and adherence measures were tested using structural equation modelling. Seeing asthma as a condition that was not present when asymptomatic was associated with more non-adherence (β=.22 p<.001) and also with collecting a smaller proportion of prescribed preventer medication over the past year (β=-.15, p<.001). Seeing asthma as an acute condition, as a condition without serious consequences, and as a condition that could not be controlled by treatment were also representations associated with non-adherence. Those who did not see the need for preventer medication at all, or did not see the need for preventer medication when asymptomatic were more likely to be non-adherent. The relationship between illness representations and self-report adherence was mediated by the belief that medication was necessary. Having identified a number of key beliefs that were associated with use of preventer medication in asthma, Study Two explored the way in which these beliefs may be developed through the process of appraisal of the influence of medication use on symptom experience. Using quantitative methods, 77 patients from a New Zealand General Practice completed a questionnaire measuring the reasons for experimenting and stopping medication, illness representations and treatment beliefs. Thirty percent of the sample reported actively experimenting with their medication. These participants were more likely to hold the belief that medication did not help in the absence of symptoms (Mann-Whitney U=343.5, p<.05) and to report trying to avoid thinking about asthma (Mann-Whitney U=330.5, p<.05). Fifty-one of the participants were subsequently interviewed about their experiences with using medication and transcripts of these interviews were subjected to a qualitative analysis. Participants’ responses suggested that the process of appraising whether medication is necessary was influenced by the match between what the participant expects to happen when using the medication and what actually does happen. The process of deciding when medication is necessary is influenced by the threshold at which medication is deemed to be necessary and the speed at which symptoms return if medication is stopped. These findings have implications for the development of interventions to improve adherence to preventer medication for asthma. They suggest that a key component of self-management education is educating patients about the nature of asthma as a chronic condition that is present even in the absence of symptoms. Additionally, they provide evidence that many patients are involved in an active process of appraising the success of their medication. Health professionals should be aware of that this process is likely to be influenced by patients’ expectations of medication, the level of symptoms at which they believe action is required to control asthma and the speed at which symptoms return if medication is discontinued. Future research could take the form of a randomised controlled intervention to assess whether discussion of these factors with patients could improve quality of life for people with asthma.
Whole document restricted, but available by request, use the feedback form to request access.

This research set out to determine factors associated with text bullying. It examined the relationship between personality traits and the level of hostility expressed by students in reaction to sample text messages. One hundred and ninety eight girls aged 13 and 14 in Canada and New Zealand volunteered to complete a questionnaire consisting of four personality measures - the impulsivity subscale of the PRF-E, cynical distrust scale (revised), needs for power scale (revised), and the rejection sensitivity scale (adult, short). The survey also rated their proposed likely response to eight sample text messages that covered four themes and to two levels of intensity. Results using Pearson’s r correlation of .01 demonstrated a significant relationship between hostility and impulsivity. There was no significant difference in either the results of the personality measures or their level of hostility between the results of the Canadian and New Zealand participants. How these findings contribute to the current theoretical knowledge of adolescent bullying and the practical application of these findings for schools are also discussed.

The physical properties of the distal stimuli activating our senses are often correlated in nature; it would therefore be advantageous to exploit such correlations to better process sensory information. Stimulus correlations can be contingent and readily available to the senses (like the temporal correlation between mouth movements and vocal sounds in speech), or can be the results of the statistical co-occurrence of certain stimulus properties that can be learnt over time (like the relation between the frequency of acoustic resonance and the size of the resonator). Over the last century, a large body of research on multisensory processing has demonstrated the existence of compatibility effects between individual features of stimuli from different sensory modalities. Such compatibility effects, termed crossmodal correspondences, possibly reflect the internalization of the natural correlation between stimulus properties. The present dissertation assesses the effects of crossmodal correspondences on multisensory processing and reports a series of experiments demonstrating that crossmodal correspondences influence the processing rate of sensory information, distort perceptual experiences and lead to stronger multisensory integration. Moreover, a final experiment investigating the effects of contingent signals’ correlation on multisensory processing demonstrates the key role of temporal correlation in inferring whether two signals have a common physical cause or not (i.e., the correspondence problem). A Bayesian framework is proposed to interpret the present results whereby stimulus correlations, represented on the prior distribution of expected crossmodal co-occurrence, operate as cues to solve the correspondence problem.

Many functions that at one time could only be performed by humans can nowadays be carried out by machines. Automation impacts many areas of life including work, home, communication and mobility. In the driving context, in-vehicle automation is considered to provide solutions for environmental, economic, safety and societal challenges. However, automation changes the driving task and the human-machine interaction. Thus, the expected benefit of in-vehicle automation can be undermined by changes in drivers’ behaviour, i.e. behavioural adaptation. This PhD project focuses on motivational as well as higher cognitive processes underlying behavioural adaptation when interacting with in-vehicle automation. Motivational processes include the development of trust and acceptance, whereas higher cognitive processes comprise the learning process as well as the development of mental models and Situation Awareness (SA). As an example for in-vehicle automation, the advanced driver assistance system Adaptive Cruise Control (ACC) was investigated. ACC automates speed and distance control by maintaining a constant set cruising speed and automatically adjusting vehicle’s velocity in order to provide a specified distance to the preceding vehicle. However, due to sensor limitations, not every situation can be handled by the system and therefore driver intervention is required. Trust, acceptance and an appropriate mental model of the system functionality are considered key variables for adequate use and appropriate SA. To systematically investigate changes in motivational and higher cognitive processes, a driving simulator as well as an on-road study were carried out. Both of the studies were conducted using a repeated-measures design, taking into account the process character, i.e. changes over time. The main focus was on the development of trust, acceptance and the mental model of novice users when interacting with ACC. By now, only few studies have attempted to assess changes in higher level cognitive processes, due to methodological difficulties posed by the dynamic task of driving. Therefore, this PhD project aimed at the elaboration and validation of innovative methods for assessing higher cognitive processes, with an emphasis on SA and mental models. In addition, a new approach for analyzing big and heterogeneous data in social science was developed, based on the use of relational databases. The driving simulator study investigated the effect of divergent initial mental models of ACC (i.e., varying according to correctness) on trust, acceptance and mental model evolvement. A longitudinal study design was applied, using a two-way (3×3) repeated measures mixed design with a matched sample of 51 subjects. Three experimental groups received (1) a correct ACC description, (2) an incomplete and idealised account omitting potential problems, and (3) an incorrect description including non-occurring problems. All subjects drove a 56-km track of highway with an identical ACC system, three times, and within a period of 6 weeks. Results showed that after using the system, participants’ mental model of ACC converged towards the profile of the correct group. Non-experienced problems tended to disappear from the mental model network when they were not activated by experience. Trust and acceptance grew steadily for the correct condition. The same trend was observed for the group with non-occurring problems, starting from a lower initial level. Omitted problems in the incomplete group led to a constant decrease in trust and acceptance without recovery. This indicates that automation failures do not negatively affect trust and acceptance if they are known beforehand. During each drive, participants continuously completed a visual secondary task, the Surrogate Reference Task (SURT). The frequency of task completion was used as objective online-measure for SA, based on the principle that situationally aware driver would reduce the engagement in the secondary task if they expect potentially critical situations. Results showed that correctly informed drivers were aware of potential system limitations and reduced their engagement in the secondary task when such situations arose. Participants with no information about limitations became only aware after first encounter and reduced secondary task engagement in corresponding situations during subsequent trials. However, trust and acceptance in the system declined over time due to the unexpected failures. Non occurring limitations tended to drop from the mental model and resulted in reduced SA already in the second trial. The on-road study investigated the learning process, as well as the development of trust, acceptance and the mental model for interacting with ACC in real conditions. Research questions aimed to model the learning process in mathematical/statistical terms, examine moments and conditions when these processes stabilize, and assess how experience changes the mental model of the system. A sample of fifteen drivers without ACC experience drove a test vehicle with ACC ten consecutive times on the same route within a 2-month period. In contrast to the driving simulator study, all participants were fully trained in ACC functionality by reading the owner’s manual in the beginning. Results showed that learning, as well as the development of acceptance and trust in ACC follows the power law of learning, in case of comprehensive prior information on system limitations. Thus, the major part of the learning process occurred during the first interaction with the system and support in explaining the systems abilities (e.g. by tutoring systems) should therefore primarily be given during this first stage. All processes stabilized at a relatively high level after the fifth session, which corresponds to 185 km or 3.5 hours of driving. No decline was observable with ongoing system experience. However, in line with the findings from the simulator study, limitations that are not experienced tended to disappear from the mental model if they were not activated by experience. With regard to the validation of the developed methods for assessing mental models and SA, results are encouraging. The studies show that the mental model questionnaire is able to provide insights into the construction of mental models and the development over time. Likewise, the implicit measurement approach to assess SA online in the driving simulator is sensitive to user’s awareness of potentially critical situations. In terms of content, the results of the studies prove the enduring relevance of the initial mental model for the learning process, SA, as well as the development of trust, acceptance and a realistic mental model about automation capabilities and limitations. Given the importance of the initial mental model it is recommended that studies on system trust and acceptance should include, and attempt to control, users’ initial mental model of system functionality. Although the results showed that also incorrect and incomplete initial mental models converged by experience towards a realistic appreciation of system functionality, the more cognitive effort needed to update the mental model, the lower trust and acceptance. Providing an idealised description, which omits potential problems, only leads to temporarily higher trust and acceptance in the beginning. The experience of unexpected limitations results in a steady decrease in trust and acceptance over time. A trial-and-error strategy for in-vehicle automation use, without accompanying information, is therefore considered insufficient for developing stable trust and acceptance. If the mental model matches experience, trust and acceptance grow steadily following the power law of learning – regardless of the experience of system limitations. Provided that such events are known in advance, they will not cause a decrease in trust and acceptance over time. Even over-information about potential problems lowers trust and acceptance only in the beginning, and not in the long run. Potential problems should therefore not be concealed in over-idealised system descriptions; the more information given, the better, in the long run. However, limitations that are not experienced tend to disappear from the mental model. Therefore, it is recommended that users be periodically reminded of system limitations to make sure that corresponding knowledge becomes re-activated. Intelligent tutoring systems incorporated in automated systems could provide a solution. In the driving context, periodic reminders about system limitations could be shown via the multifunction displays integrated in most modern cars. Tutoring systems could also be used to remind the driver of the presence of specific in-vehicle automation systems and reveal their benefits
Viele Aufgaben, die ehemals von Menschen ausgeführt wurden, werden heute von Maschinen übernommen. Dieser Prozess der Automatisierung betrifft viele Lebensbereiche von Arbeit, Wohnen, Kommunikation bis hin zur Mobilität. Im Bereich des Individualverkehrs wird die Automatisierung von Fahrzeugen als Möglichkeit gesehen, zukünftigen Herausforderungen wirtschaftlicher, gesellschaftlicher und umweltpolitischer Art zu begegnen. Allerdings verändert Automatisierung die Fahraufgabe und die Mensch-Technik Interaktion im Fahrzeug. Daher können beispielsweise erwartete Sicherheitsgewinne automatisch agierender Assistenzsysteme durch Veränderungen im Verhalten des Fahrers geschmälert werden, was als Verhaltensanpassung (behavioural adaptation) bezeichnet wird. Dieses Dissertationsprojekt untersucht motivationale und höhere kognitive Prozesse, die Verhaltensanpassungen im Umgang mit automatisierten Fahrerassistenzsystemen zugrunde liegen. Motivationale Prozesse beinhalten die Entwicklung von Akzeptanz und Vertrauen in das System, unter höheren kognitiven Prozessen werden Lernprozesse sowie die Entwicklung von mentalen Modellen des Systems und Situationsbewusstsein (Situation Awareness) verstanden. Im Fokus der Untersuchungen steht das Fahrerassistenzsystem Adaptive Cruise Control (ACC) als ein Beispiel für Automatisierung im Fahrzeug. ACC regelt automatisch die Geschwindigkeit des Fahrzeugs, indem bei freier Fahrbahn eine eingestellte Wunschgeschwindigkeit und bei einem Vorausfahrer automatisch ein eingestellter Abstand eingehalten wird. Allerdings kann ACC aufgrund von Einschränkungen der Sensorik nicht jede Situation bewältigen, weshalb der Fahrer übernehmen muss. Für diesen Interaktionsprozess spielen Vertrauen, Akzeptanz und das mentale Modell der Systemfunktionalität eine Schlüsselrolle, um einen sicheren Umgang mit dem System und ein adäquates Situationsbewusstsein zu entwickeln. Zur systematischen Erforschung dieser motivationalen und kognitiven Prozesse wurden eine Fahrsimulatorstudie und ein Versuch im Realverkehr durchgeführt. Beide Studien wurden im Messwiederholungsdesign angelegt, um dem Prozesscharakter gerecht werden und Veränderungen über die Zeit erfassen zu können. Die Entwicklung von Vertrauen, Akzeptanz und mentalem Modell in der Interaktion mit ACC war zentraler Forschungsgegenstand beider Studien. Bislang gibt es wenige Studien, die kognitive Prozesse im Kontext der Fahrzeugführung untersucht haben, unter anderem auch wegen methodischer Schwierigkeiten in diesem dynamischen Umfeld. Daher war es ebenfalls Teil dieses Dissertationsprojekts, neue Methoden zur Erfassung höherer kognitiver Prozesse in dieser Domäne zu entwickeln, mit Fokus auf mentalen Modellen und Situationsbewusstsein. Darüber hinaus wurde auch ein neuer Ansatz für die Analyse großer und heterogener Datenmengen im sozialwissenschaftlichen Bereich entwickelt, basierend auf dem Einsatz relationaler Datenbanken. Ziel der der Fahrsimulatorstudie war die systematische Erforschung des Effekts von unterschiedlich korrekten initialen mentalen Modellen von ACC auf die weitere Entwicklung des mentalen Modells, Vertrauen und Akzeptanz des Systems. Eine Stichprobe von insgesamt 51 Probanden nahm an der Studie teil; der Versuch wurde als zweifaktorielles (3x3) gemischtes Messwiederholungsdesign konzipiert. Die 3 parallelisierten Versuchsgruppen zu je 17 Personen erhielten (1) eine korrekte Beschreibung des ACC, (2) eine idealisierte Beschreibung unter Auslassung auftretender Systemprobleme und (3) eine überkritische Beschreibung mit zusätzlichen Hinweisen auf Systemprobleme, die nie auftraten. Alle Teilnehmer befuhren insgesamt dreimal im Zeitraum von sechs Wochen dieselbe 56 km lange Autobahnstrecke im Fahrsimulator mit identischem ACC-System. Mit zunehmendem Einsatz des ACC zeigte sich im anfänglich divergierenden mentalen Modell zwischen den Gruppen eine Entwicklung hin zum mentalen Modell der korrekt informierten Gruppe. Nicht erfahrene Systemprobleme tendierten dazu, im mentalen Modell zu verblassen, wenn sie nicht durch Erfahrung reaktiviert wurden. Vertrauen und Akzeptanz stiegen stetig in der korrekt informierten Gruppe. Dieselbe Entwicklung zeigte sich auch in der überkritisch informierten Gruppe, wobei Vertrauen und Akzeptanz anfänglich niedriger waren als in der Bedingung mit korrekter Information. Verschwiegene Systemprobleme führten zu einer konstanten Abnahme von Akzeptanz und Vertrauen ohne Erholung in der Gruppe mit idealisierter Beschreibung. Diese Resultate lassen darauf schließen, dass Probleme automatisierter Systeme sich nicht zwingend negativ auf Vertrauen und Akzeptanz auswirken, sofern sie vorab bekannt sind. Bei jeder Fahrt führten die Versuchsteilnehmer zudem kontinuierlich eine visuell beanspruchende Zweitaufgabe aus, die Surrogate Reference Task (SURT). Die Frequenz der Zweitaufgabenbearbeitung diente als objektives Echtzeitmaß für das Situationsbewusstsein, basierend auf dem Ansatz, dass situationsbewusste Fahrer die Zuwendung zur Zweitaufgabe reduzieren wenn sie potentiell kritische Situationen erwarten. Die Ergebnisse zeigten, dass die korrekt informierten Fahrer sich potentiell kritischer Situationen mit möglichen Systemproblemen bewusst waren und schon im Vorfeld der Entstehung die Zweitaufgabenbearbeitung reduzierten. Teilnehmer ohne Informationen zu auftretenden Systemproblemen wurden sich solcher Situationen erst nach dem ersten Auftreten bewusst und reduzierten in entsprechenden Szenarien der Folgefahrten die Zweitaufgabenbearbeitung. Allerdings sanken Vertrauen und Akzeptanz des Systems aufgrund der unerwarteten Probleme. Erwartete, aber nicht auftretende Systemprobleme tendierten dazu, im mentalen Modell des Systems zu verblassen und resultierten in vermindertem Situationsbewusstsein bereits in der zweiten Fahrt. Im Versuch unter Realbedingungen wurden der Lernprozesses sowie die Entwicklung des mentalen Modells, Vertrauen und Akzeptanz von ACC im Realverkehr erforscht. Ziele waren die statistisch/mathematische Modellierung des Lernprozesses, die Bestimmung von Zeitpunkten der Stabilisierung dieser Prozesse und wie sich reale Systemerfahrung auf das mentale Modell von ACC auswirkt. 15 Versuchsteilnehmer ohne ACC-Erfahrung fuhren ein Serienfahrzeug mit ACC insgesamt 10-mal auf der gleichen Strecke in einem Zeitraum von 2 Monaten. Im Unterschied zur Fahrsimulatorstudie waren alle Teilnehmer korrekt über die ACC-Funktionen und Funktionsgrenzen informiert durch Lesen der entsprechenden Abschnitte im Fahrzeughandbuch am Beginn der Studie. Die Ergebnisse zeigten, dass der Lernprozess sowie die Entwicklung von Akzeptanz und Vertrauen einer klassischen Lernkurve folgen – unter der Bedingung umfassender vorheriger Information zu Systemgrenzen. Der größte Lernfortschritt ist am Beginn der Interaktion mit dem System sichtbar und daher sollten Hilfen (z.B. durch intelligente Tutorsysteme) in erster Linie zu diesem Zeitpunkt gegeben werden. Eine Stabilisierung aller Prozesse zeigte sich nach der fünften Fahrt, was einer Fahrstrecke von rund 185 km oder 3,5 Stunden Fahrzeit entspricht. Es zeigten sich keine Einbrüche in Akzeptanz, Vertrauen bzw. dem Lernprozess durch die gemachten Erfahrungen im Straßenverkehr. Allerdings zeigte sich – analog zur Fahrsimulatorstudie – auch in der Realfahrstudie ein Verblassen von nicht erfahrenen Systemgrenzen im mentalen Modell, wenn diese nicht durch Erfahrungen aktiviert wurden. Im Hinblick auf die Validierung der neu entwickelten Methoden zur Erfassung von mentalen Modellen und Situationsbewusstsein sind die Resultate vielversprechend. Die Studien zeigen, dass mit dem entwickelten Fragebogenansatz zur Quantifizierung des mentalen Modells Einblicke in Aufbau und Entwicklung mentaler Modelle gegeben werden können. Der implizite Echtzeit-Messansatz für Situationsbewusstsein im Fahrsimulator zeigt sich ebenfalls sensitiv in der Erfassung des Bewusstseins von Fahrern für potentiell kritische Situationen. Inhaltlich zeigen die Studien die nachhaltige Relevanz des initialen mentalen Modells für den Lernprozess sowie die Entwicklung von Situationsbewusstsein, Akzeptanz, Vertrauen und die weitere Ausformung eines realistischen mentalen Modells der Möglichkeiten und Grenzen automatisierter Systeme. Aufgrund dieser Relevanz wird die Einbindung und Kontrolle des initialen mentalen Modells in Studien zu automatisierten Systemen unbedingt empfohlen. Die Ergebnisse zeigen zwar, dass sich auch unvollständige bzw. falsche mentale Modelle durch Erfahrungslernen hin zu einer realistischen Einschätzung der Systemmöglichkeiten und -grenzen verändern, allerdings um den Preis sinkenden Vertrauens und abnehmender Akzeptanz. Idealisierte Systembeschreibungen ohne Hinweise auf mögliche Systemprobleme bringen nur anfänglich etwas höheres Vertrauen und Akzeptanz. Das Erleben unerwarteter Probleme führt zu einem stetigen Abfall dieser motivationalen Faktoren über die Zeit. Ein alleiniges Versuchs-Irrtums-Lernen für den Umgang mit automatisierter Assistenz im Fahrzeug ohne zusätzliche Information wird daher als nicht ausreichend für die Entwicklung stabilen Vertrauens und stabiler Akzeptanz betrachtet. Wenn das initiale mentale Modell den Erfahrungen entspricht, entwickeln sich Akzeptanz und Vertrauen gemäß einer klassischen Lernkurve – trotz erlebter Systemgrenzen. Sind diese potentiellen Probleme vorher bekannt, führen sie nicht zwingend zu einer Reduktion von Vertrauen und Akzeptanz. Auch zusätzliche überkritische Information vermindert Vertrauen und Akzeptanz nur am Beginn, aber nicht langfristig. Daher sollen potentielle Probleme in automatisierten Systemen nicht in idealisierten Beschreibungen verschwiegen werden – je präzisere Information gegeben wird, desto besser im langfristigen Verlauf. Allerdings tendieren nicht erfahrene Systemgrenzen zum Verblassen im mentalen Modell. Daher wird empfohlen, Nutzer regelmäßig an diese Systemgrenzen zu erinnern um die entsprechenden Facetten des mentalen Modells zu reaktivieren. In automatisierten Systemen integrierte intelligente Tutorsysteme könnten dafür eine Lösung bieten. Im Fahrzeugbereich könnten solche periodischen Erinnerungen an Systemgrenzen in Multifunktionsdisplays angezeigt werden, die mittlerweile in vielen modernen Fahrzeugen integriert sind. Diese Tutorsysteme können darüber hinaus auch auf die Präsenz eingebauter automatisierter Systeme hinweisen und deren Vorteile aufzeigen

Antecedents: No hi ha gaire coneixement sobre el neurodesenvolupament de preescolars i la seva susceptibilitat enfront a factors ambientals.
Objectius: Avaluar les respostes del neurodesenvolupament en nens i les seves característiques psicomètriques, i, si factors ambientals primerencs (ex., duració de la lactància materna i mares que fumen) poden influir tals respostes.
Mètodes: Dues cohorts prospectives des del naixement en població general (Menorca (N=421) i Ribera d'Ebre (N=79)) van se seguides fins als 4 anys d'edat durant un període de dos anys (2001-2003). Els nens van ser avaluats per tres psicòlegs i els seus respectius mestres per les funcions neuropsicològiques (MCSA), els comportaments de dèficit d'atenció i d'hiperactivitat (TDAH-DSM-IV) i la competència social (CPSCS); junt amb l'administració (en persona) a les mares de qüestionaris generals.
Resultats: Les respostes van mostrar característiques psicomètriques acceptables i els patrons neuropsicològics del TDAH eren consistents amb altres troballes sobre TDAH. La lactància materna de llarga durada estava associada amb una millora de totes les àrees comportamentals avaluades. Fumar durant l'embaràs estava associat a puntuacions cognitives més baixes.
Conclusions: Avaluar el neurodesenvolupament a preescolars sans és factible i necessari per investigar efectes primerencs de factors ambientals i aplicar polítiques preventives de salut pública.
Background: Little is known about neurodevelopment among preschoolers and its susceptibility to environmental factors.
Objectives: Assess neurodevelopmental outcomes and their psychometric characteristics in children; and, if early environmental factors (i.e., duration of breastfeeding and maternal smoking) influence the neurobehavioral outcomes.
Methods: Two prospective population-based birth cohorts (Menorca (N=421) and Ribera d'Ebre county (N=79)) were followed up at the age of 4 years during a two year period (2001-2003). Children were assessed by three psychologists and their respective teachers for neuropsychological functions (MCSA), inattention-hyperactivity behaviors (ADHD-DSM-IV) and social behavior (CPSCS); in addition to maternal in person general questionnaires.
Results: Outcomes showed acceptable psychometric characteristics and ADHD neuropsychological patterns were consistent with other ADHD findings. Long-term breastfeeding was associated with the improvement of all behavioral areas assessed. Maternal smoking during pregnancy was associated with lower cognitive scores.
Conclusions: Assessing neurodevelopment in healthy preschoolers is feasible and necessary to investigate early effects of environmental factors and apply public health preventive policies.

La schizophrénie est une maladie psychiatrique très invalidante qui concerne près de 1% de la population. Bien que son étiologie soit toujours inconnue, elle est certainement multifactorielle et comprend une interaction entre prédisposition génétique et facteurs environnementaux. Il existe des traitements médicamenteux mais ils ne sont pas totalement efficaces, particulièrement pour la prise en charge des symptômes négatifs et des déficits cognitifs. Le développement de nouveaux traitements plus efficaces passe par l’amélioration des modèles animaux prenant en compte le caractère multifactoriel de l’étiologie de cette pathologie.Nous avons développé un modèle murin multifactoriel de schizophrénie innovant (modèle 3-hit) présentant une forte validité de construction. Pour cela, nous avons combiné une modification génétique (1er hit : délétion partielle du gène MAP6) avec un stress environnemental précoce (2nd hit : séparation maternelle de 24h au 9ème jour de vie) et une exposition tardive au THC durant l’adolescence (3ème hit : administration quotidienne de tétrahydrocannabinol à 8mg/kg du 32ème au 52ème jour).Dans un premier temps, nous avons montré une bonne validité d’apparence de ce modèle à travers des études comportementale, en imagerie et en électrophysiologie. En effet, au niveau comportemental les souris 3-hit présentent des symptômes de type négatif, des déficits cognitifs et une altération de la latéralité olfactive. Nous avons aussi montré un déficit d’inhibition du réflexe de sursaut, qui est un élément comportemental clef dans les modèles animaux de schizophrénie, car il est également utilisé en recherche clinique. Nous avons également observé certaines altérations morphologiques et fonctionnelles cérébrales caractéristiques de la schizophrénie comme une réduction du volume de l’hippocampe, une altération des fibres du corps calleux et un dysfonctionnement des systèmes de neurotransmission glutamatergique et GABAergique. Certains dimorphismes sexuels ont été également montrés dans nos études.Dans un deuxième temps, nous avons comparé les déficits des animaux 3-hit avec ceux d’autres modèles de schizophrénie développés au laboratoire. La caractérisation des effets de chaque facteur, indépendamment et en association, nous a permis de mettre en évidence un phénomène de synergie entre les facteurs et non une simple addition des déficits induits par chacun d’entre eux.Le modèle de schizophrénie 3-hit présente de bonnes validités de construction et d’apparence, il est maintenant nécessaire afin de parfaire sa caractérisation de tester sa validité pharmacologique
Affecting 1% of worldwide population, schizophrenia is a debilitating pathology. Whether the aetiology of schizophrenia remains unknown, its multifactorial aspect is conversely now well admitted, and certainly gathers genetic vulnerability and environmental factors. Actual treatments are still unmet, particularly for negative and cognitive symptoms. For a better translation from treatments design of schizophrenia to clinical efficiency, there is a crucial need to refine preclinical animal models that considers the multifactorial aspects of this disease.We developed a new murine multifactorial model of schizophrenia (3-hit), that possesses a strong construct validity. To this, we combined a genetic predisposition (1st hit: partial deletion of MAP-6) with an early postnatal stress (2nd hit: 24 h maternal separation at postnatal day 9), and a late cannabinoid exposure during adolescence (3rd hit: tetrahydrocannabinol THC from post-natal day 32 to 52; 8 mg/kg/day).First, we characterised a promising face validity through behavioural, imaging and electrophysiological studies. At behavioural level, we demonstrated that 3-hit mice displayed negative-like symptoms, cognitive deficits and altered olfactory laterality. Moreover, we showed a sensory motor gating deficit, that is a major translational clue for animal models of schizophrenia. Additionally, 3-hit mice displayed some characteristic morphological and functional impairments of the disease: reduced hippocampal volume, altered callosal fibres, glutamatergic and GABAergic neurotransmission dysfunctions. We moreover highlighted some sexual dimorphisms.Second, we compared deficits of 3-hit mice to those of others models of schizophrenia developed in our laboratory. Deficits induced by one factor, or combination of several factors, evidenced a synergistic effect, and not a simple addition between each of them.The 3-hit model therefore presents strong construct validity and promising face validity, encouraging to assess the pharmacological validity

L’objectif de cette thèse est d’identifier les compétences interculturelles qui déterminent la disposition des gestionnaires au changement organisationnel. Pour ce faire, nous avons analysé l’influence des compétences interculturelles, impliquant des aptitudes cognitives, des habiletés émotives et des compétences comportementales/sociales chez les gestionnaires, sur la disposition au changement. Afin de tester notre modèle de recherche, incluant douze hypothèses principales nous avons eu recours à une enquête avec un questionnaire électronique auto-administré. Notre échantillon total compte cinq cent cinquante- sept personnes en provenance de soixante-huit pays différents. Les personnes interrogées, des salariés d’entreprises, occupent des postes à différents niveaux hiérarchiques : au niveau stratégique, mais aussi au niveau opérationnel, c’est-à- dire, des gestionnaires qui sont responsables de la planification à long terme, du contrôle du progrès, ou de la supervision quotidienne des opérations. La compréhension du concept de la compétence interculturelle était un aspect essentiel dans cette thèse de doctorat. La partie théorique a donc été écrite discrétionnairement par le chercheur au sujet des références choisies sur lesquelles le cadre conceptuel a été établi. Une partie empirique a été soutenue avec une analyse méthodologique quantitative afin de prouver qu’il y a une corrélation positive significative entre la compétence interculturelle et la disposition des gestionnaires au changement organisationnel
The object of this thesis is to discover the intercultural competencies that determine manager’s readiness for organizational change. Through the analysis of twelve main hypotheses; regarded as intercultural competence; involving cognitive capabilities, emotional abilities and behavioural/social skills in managers; and their influence on readiness for change, the procedure to validate the general hypothesis includes an electronic self-administered questionnaire and a total of five hundred and fifty seven respondents from sixty-eight different nationalities. The respondents are managers of corporations who hold strategic, tactical or operational management positions; that is, managers who are responsible for long-term planning, progress monitoring, or day-to-day operational supervision.The understanding of the concept of intercultural competence is a central aspect in this dissertation and therefore the theoretical part has been written discretionarily by the researcher concerning the selected references upon which the conceptual framework was built. An empirical part is supported with a quantitative methodological analysis in order to prove that there is a significant positive correlation between intercultural competence and managers’ readiness for organizational change

L’allogreffe de cellules souches hématopoïétiques, ou greffe de moelle osseuse, fait partie des traitements proposés pour enrayer la course d’hémopathies malignes telles que la leucémie aiguë. Cette intervention consiste à remplacer les cellules du sang malades par des cellules saines, grâce à un donneur compatible afin de maximiser les chances de réussite. Bien que l’injection du greffon apparaisse comme une intervention relativement simple, il n’en demeure pas moins que cet acte s’inscrit dans un processus qui commence bien avant l’intervention et qui a des conséquences durant les mois, voire les années qui suivent l’allogreffe. Ainsi, le parcours de soin du patient peut être divisé en trois étapes : l’avant-greffe, l’hospitalisation en secteur protégé et l’après-greffe avec le retour à domicile. On peut observer à ces différents stades une altération de la qualité de vie, la présence de symptômes de détresse psychologique, voire un état de stress post-traumatique (ESPT). Cependant, ces conséquences psychologiques peuvent différer d’un individu à l’autre suggérant que certains facteurs, autres que médicaux, pourraient influer les conséquences tant physiques que psychologiques de la greffe. C’est dans cette perspective et en s’appuyant sur le modèle Multidimensionnel Intégratif et Transactionnel de Bruchon –Schweitzer et Boujut (2014) ainsi que sur l’approche complète de l’état de santé mentale de Keyes et Lopez (2002), que quatre études ont été réalisées dans ce travail de thèse en psychologie de la santé. L’objectif était de mettre en avant les différents facteurs psychologiques protecteurs et délétères aux différents stades de la greffe sur la santé mentale et physique des patients, en mettant l’accent sur des facteurs peu explorés à ce jour et issus de la troisième vague des thérapies cognitives et comportementales telle que la thérapie d’acceptation et d’engagement. Après avoir validé une version française de l’échelle AFQ (article 1), il ressort de la première étude « psygreffe » que le niveau de bonheur avant la greffe contribue à une meilleure qualité de vie avant la greffe (article 2). La seconde étude psygreffe a mis en avant l’effet prospectif des préoccupations anxieuses durant l’hospitalisation sur la survenue d’un état de stress post-traumatique, et l’effet positif de l’esprit combatif sur le niveau de résilience et de bonheur cinq mois après la greffe (article 3). La troisième étude psygreffe a révélé que plus les personnes tendaient à être dans l’évitement expérientiel plus elles risquaient de présenter des symptômes d’ESPT, tandis que les patients présentant des scores élevés de non-jugement (une facette de la pleine conscience) avaient de moindre risques de présenter une telle symptomatologie (article 4). La quatrième étude psygreffe montre que l’expérience de changements de vie positifs dans la vie des patients après la greffe est loin d’être systématique. Les patients montrent plutôt un déclin de leur santé psychologique cinq mois après la greffe qui serait relié à un faible niveau d’acceptation (article 5). L’ensemble de ces résultats nous a amené à réfléchir et à proposer une intervention adaptée aux besoins des patients (i.e. une plateforme numérique) basée sur des interventions efficaces en psycho-oncologie et sur les thérapies basées sur internet. Dans cette perspective, un premier dispositif (i.e. DESP task) visant à remédier les biais attentionnels impliqués dans l’anxiété et la dépression a été élaborée et testé, dans un premier temps en laboratoire (article 6). La DESP a fait l’objet d’une déclaration d’invention (déclaration d’invention n°0487-UCADESPTASK). Proposer une continuité dans la prise en charge et tenter de pallier les obstacles inhérents aux spécificités du parcours de greffe s’avère essentiel pour améliorer la prise en charge des patients et les accompagner durant ce parcours
Hematopoietic stem cells allograft, or bone marrow transplantation, is one of the treatments proposed to stop the course of hematopoietic malignancies such as acute leukemia. This procedure consists of replacing the cells in the diseased blood with healthy cells from a compatible donor to maximize the chances of success. Although injecting the graft appears to be a relatively simple procedure, it is nonetheless part of a whole process that begins well before the procedure and has consequences in the months and even years following the allograft. Thus, the patient's care pathway can be divided into three stages: the pre-transplant, hospitalization in a protected sector, and the post-transplant period with the return home. At these different stages, an alteration in quality of life, the presence of symptoms of psychological distress and even a state of post-traumatic stress disorder (PTSD) can be observed. However, these psychological consequences may differ from one individual to another, suggesting that certain factors, other than medical ones, could influence both the physical and psychological consequences of the allograft. It is in this perspective and based on the Transactional Integrative and Multidimensional Model of Bruchon-Schweitzer and Boujut (2014) and the Complete State Health Approach of Keyes and Lopez (2002) that four studies were conducted in this thesis work in health psychology. The objective was to highlight the different protective and deleterious psychological factors at the different stages of allograft on the mental and physical health of patients, focusing on factors little explored to date and from the third wave of cognitive and behavioural therapies such as acceptance and commitment therapy. After validating a French version of the AFQ scale (article 1), the first study found that the level of happiness before the transplant contributes to a better quality of life before the procedure (article 2). The second highlighted the prospective effect of anxious preoccupations during hospitalization on the occurrence of post-traumatic stress disorder and the positive effect of fighting spirit on the level of resilience and happiness five months post-transplant (article 3). The third one revealed that the more people tended to be in experiential avoidance, the more likely they were to develop symptoms of PTSD, while patients with high non-judgmental scores (a facet of mindfulness) were less likely to develop such symptomatology (article 4). Finally, the fourth study shows that the experience of positive life changes in patients' lives after transplantation is far from systematic. Rather, patients show a decline in their psychological health that is related to a low level of acceptance (article 5). All of these results led us to reflect and propose an intervention adapted to the needs of patients (i.e. a digital platform) based on effective interventions in psycho-oncology and web-based therapies. In this perspective, a first device (i.e. DESP task) aimed at remedying the attentional biases involved in anxiety and depression has been developed and tested (article 6). The DESP has been the subject of a declaration of invention (declaration of invention n°0487-UCADESPTASK). Proposing a continuity of care and trying to overcome the obstacles inherent to the specificities of the allograft course is essential to improve the care of patients and accompany them during this pathway

Most computer users have experienced login problems such as, forgetting passwords, loosing token cards and authentication dongles, failing that complicated screen pattern once again, as well as, interaction difficulties in usability. Facing the difficulties of non-flexible strong authentication solutions, users tend to react with poor acceptance or to relax the assumed correct use of authentication procedures and devices, rendering the intended security useless. Biometrics can, sort of, solve some of those problems. However, despite the vast research, there is no perfect solution into designing a secure strong authentication procedure, falling into a trade off between intrusiveness, effectiveness, contextual adequacy and security guarantees. Taking advantage of new technology, recent research onmulti-modal, behavioural and cognitive oriented authentication proposals have sought to optimize trade off towards precision and convenience, reducing intrusiveness for the same amount of security. But these solutions also fall short with respect to different scenarios. Users perform currently multiple authentications everyday, through multiple devices, in panoply of different situations, involving different resources and diverse usage contexts, with no "better authentication solution" for all possible purposes. The proposed framework enhances the recent research in user authentication services with a broader view on the problems involving each solution, towards an usable secure authentication methodology combining and exploring the strengths of each method. It will than be used to prototype instances of new dynamic multifactor models (including novel models of behavioural and cognitive biometrics), materializing the PiB (perceiving is believing) authentication. Ultimately we show how the proposed framework can be smoothly integrated in applications and other authentication services and protocols, namely in the context of SSO Authentication Services and OAuth.

Despite a growing appreciation in New Zealand of the harms arising from gambling, there remains a lack of knowledge and awareness of the dangers associated with participation in gambling by young people. Although international research has demonstrated that young people are a high-risk group with regard to problem gambling, research in New Zealand has only investigated the gambling behaviour of those aged 18 and over. This thesis explores a topic that has been largely neglected within New Zealand: the relevance of gambling and problem gambling for New Zealand adolescents. A questionnaire consisting of both standardised and non-standardised items, was administered to a random sample of more than 2000 secondary school students in the Upper North Island. The role of gambling in adolescent life, the prevalence of adolescent problem gambling, and associated risk factors were investigated. This research also adopted a largely unique perspective within the youth gambling field, extending investigations to include the role of protective factors, particularly social connectedness. This investigation of protective factors supports strengths-based approaches to youth behavioural issues, with the potential to aid in the prevention or minimisation of harm, as opposed to approaches that focus upon responding to problems, as is encouraged by dysfunction-based models. This research demonstrates that gambling is part of youth culture in New Zealand. It provides the first body of data detailing the practices, beliefs, and other factors associated with adolescent gambling behaviour within New Zealand. The findings indicate that choices around gambling are strongly influenced by contextual factors and that young New Zealander’s participate in a wide variety of gambling modes. While most gamble safely, approximately four percent were observed to satisfy the problem gambling criteria. Social connectedness was strongly correlated to problem gambling behaviour and the research points towards the investigation of protective factors, resiliency, and strengths-based strategies in the future. The continuing exploration of common denominators between gambling and other dangerous consumptions also offer promising avenues for future research within the gambling field. This research demonstrates that youth gambling is an issue requiring the attention of families, communities, schools, researchers, government departments, and members of the gambling industries.

Using a sample of 519 Australian Defence Force (ADF) personnel deployed on service to Iraq and Afghanistan during 2008, this thesis proposed and tested a model for post-trauma pathology through a prospective, longitudinal examination of the relationship between cognitive, emotional regulation and behavioural factors and post-traumatic stress and psychological distress. Data was collected at three time points. The first was prior to deployment with data collected on self and world beliefs, appraisal style, capacity for emotional regulation, coping behaviour, pre-existing levels of pathology and previous operational experience. The second was at the end of the deployment with data collected on the cognitive and emotion variables, exposure to trauma and non-traumatic stressors, and post-traumatic stress and psychological distress. The third was at follow-up, 4-8 months following return to Australia, with data collected on coping behaviour, post-traumatic stressand psychological distress. The variables under question are important to study as they are measurable, and in high-risk populations potentially modifiable through intervention prior to exposure to trauma. The vulnerability model proposed in this thesis provides support for cognitive and appraisal theories of post-traumatic stress and related pathology. It identifies preexisting cognitive, emotional and behavioural factors that contribute to the prediction of both post-trauma and ongoing pathology. The research found that the variables were remarkably stable across the deployment, with variation explained more by exposure to deployment-related stressors, than by exposure to traumatic events. This is thought to be because traumatic events were to some degree anticipated, and occurred in context, whereas non-traumatic deployment related stressors were more difficult to prepare for, and may have contributed to increased frustration and stress over time. The findings showed that negative beliefs around benevolence of the world, and a lack of emotional regulation strategies were associated with increased post-traumatic stress at the end of the deployment, while non-acceptance of emotional response and a lack of emotional regulation strategies were associated with increased psychological distress. At follow-up, avoidant coping behaviour was related to increased pathology, while a lack ofself-worth, strong beliefs around events having meaning, and a reduced ability to pursue goal directed behaviour were associated with post-traumatic stress. A general lack of awareness and acceptance of emotional response, and strong positive beliefs about the benevolence of the world, were associated with increased psychological distress. There was also a general tendency to adopt a problem-focussed coping style in preference to emotion-focussed strategies, and the research found that this, combined with a reluctance to adopt emotion-focussed strategies, may act as a risk factor for poor adjustment. This is thought to be because many of the problems causing distress are not able to be readily addressed, and so the application of problem-focussed strategies has the potential to be unsuccessful, and result in increased frustration and distress. This thesis identifies a need for education for Defence personnel into the role of appraisals and beliefs in influencing peri-and post-deployment adjustment, the relationship between emotional expression and adaptive adjustment, and the need to be able to access alternate coping strategies. The research was unique in integrating preexisting cognitive, emotional and behavioural factors as predictors of pathology, and paves the way for further research into how these factors influence adjustment among other high-risk populations.

Two decades of research on obsessive-compulsive disorder (OCD) has helped us develop a strong understanding of why obsessions are often followed by the performance of a compulsive act. What we have understood less well is why that act is repeated, even though it often results in an increase, rather than decrease, in discomfort. Emergent research on compulsive checking implicates a number of beliefs—including perceived responsibility, perceived harm, need for certainty, and beliefs about one’s memory— that may influence behavioural parameters (e.g., check duration) of checking episodes. Furthermore, it has also been suggested that the act of compulsive checking may recur in part because of a self-perpetuating mechanism in which checking has paradoxical effects on these beliefs. Finally, some researchers have proposed that attentional focus (e.g., focus on threat) during checking may be related these paradoxical outcomes. At present, these ideas are mostly speculative, in part because there have been so few detailed studies of the actual phenomenology of compulsive rituals. The purpose of the present research was to gather phenomenological data on compulsions as performed by a clinical sample under ecologically valid conditions. Study 1 extended emergent research suggesting that compulsions may persist because the act of checking has a number of ironic effects on beliefs. Individuals with a diagnosis of obsessive-compulsive disorder (OCD) and anxious controls (AC) completed a naturalistic stove task in our laboratory kitchen. Participants were fitted with portable eyetracking equipment and left on their own to boil a kettle, turn the stove off, and check to ensure that the stove is safe before leaving the kitchen. Surrounding the stove were household items that are “threatening” (e.g., matches) or “non-threatening” (e.g., mugs). Ratings of mood, responsibility, harm (severity, probability) and memory confidence were taken pre- and post-task and a portable eyetracker was used to monitor attention throughout the stove task. We examined the relations between behavioural indices (check duration, attentional focus) and pre- and post-task ratings of responsibility, perceived harm, mood, and memory confidence. Although we found that OCD (as compared to AC) participants took significantly longer to leave the kitchen after using the stove, we found no evidence that stronger pre-task ratings of responsibility, perceived harm, or memory confidence were associated with longer check duration. However, we found some evidence of an ironic effect whereby greater check duration was associated with greater perceived harm and decreased certainty about having properly ensured the stove was off. Of note, these ironic effects were not unique to participants with OCD, but were also observed in the AC group. With respect to the eyetracking data, we found minimal evidence linking threat fixations and beliefs in participants with OCD. In contrast, a number of interesting relations emerged in the eyetracking data of our anxious control participants. For AC participants, a greater proportion of time spent looking at the stove was associated with greater post-task sense of responsibility for preventing harm, greater post-task harm estimates, decreased certainty (about having ensured the stove was off), and decreased confidence in memory for the task. In Study 2, individuals with a diagnosis of OCD completed a structured diary of their compulsions as they occurred naturally over a three˗day period. Participants recorded the circumstances leading to each compulsion and reported on the acts involved in the compulsive ritual, the duration and repetitiveness of the ritual, and the criteria used to determine completeness of the ritual. The findings of this study suggest that unsuccessful compulsions (i.e., compulsions in which certainty was not achieved) were associated with a longer duration (trend), more repetitions, a higher standard of evidence, and offered little in the way of distress reduction. These findings are discussed within the theoretical context of cognitive˗behavioural model of obsessive˗compulsive disorder and clinical implications are offered.

The frequency of all residential fires that are attended by the Melbourne Metropolitan Fire Brigade is routinely recorded and hence well known. However, the frequency of residential fires which are not attended, including instances where the occupant of a dwelling has extinguished the fire or the fire has self-extinguished, has not previously been investigated in an Australian sample. This project includes two studies: in the first study the aim was to develop the Fire Safety Awareness and Experience Interview Schedule and to determine whether the risk factors for attended fires (in which there are fatalities or injuries) are different to the risk factors of residential fires not attended to by the fire brigade. Additionally, the first study aimed to determine the incidence of unattended residential fires by retrospective report from adults since the age of 18. The second study aim was to determine whether correct and regular maintenance behaviours were being carried out by occupants who own a smoke alarm. Five hundred participants, recruited from four shopping centers located in Melbourne, Victoria, completed the Fire Safety Awareness and Experience Interview Schedule. The questionnaire collected information on all residential fire experiences, including attended and unattended fires, since the age 18. Results showed that participants had approximately a 50% chance of experiencing either an attended or unattended residential fire within their adult lifetime; and the mean annual probability of having an unattended fire experience (0.8 fires per 100 adult years) was higher than the probability of having an attended fire experience (0.37 fires per 100 adult years). In addition, of all residential fires in which fire service attendance status was known, the vast majority of fires (78%) were unattended. Results also revealed the vast majority of unattended fires were caused when cooking was left unsupervised by the cook; and oil or food was usually the first material ignited. Of concern is the number of instances in which the unattended fire was extinguished via dangerous actions (i.e. moving the burning object the sink or floor of the home). It is therefore important to educate people on how to safely fight a cooking fire should one occur and occupants should be encouraged to have a fire blanket in an accessible location in their kitchens. Findings from Study Two revealed that the vast majority of the sample (96%) reported owning a smoke alarm. However, over one third of owners are not testing their alarms and 17% are not carrying out battery changes. Overall, the results from this project can be used to help prevent cooking fires in Australia and the developed interview schedule can be used to collect comparison data from other States and Territories. Furthermore, the development instrument can be used to collect unattended home fire data internationally.

Bibliography: p. 316-343.
xix, 450 p. : ill. ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Thesis (Ph.D.)--University of Adelaide, Dept. of Psychology, 1998?

Community interventions are a recent development in the field of prevention. This study sought to address the current gap in this area, between scientific knowledge and community practice, through an understanding of practitioners’ experiences of implementation. A case study was undertaken to explore the context and complexity of implementation processes. Data was collected concurrently with the implementation of a community intervention located in rural Victoria, Australia, which aimed to reduce early school leaving. Implementers’ perspectives on a guide to best practice, developed from the academic literature, were sought. Concepts from systems theory and ecological approaches were combined to create a framework suitable for the analysis of the data. The intervention was viewed as an open system. Its progression from being a subsystem of the funded organization to a subsystem of both the funded organization and the community was examined. Factors such as meeting community needs and community members as program staff were found to facilitate community acceptance. The interactions within and between the subsystems of the intervention and the community were also explored. School retention rates were suggestive of some level of impact on school leaving. Additional positive outcomes were the facilitation and/or strengthening of links between community subsystems, and a perceived change within the funded organization. This thesis goes some way towards bridging the gap between science and practice in this field. Findings contribute to the debate regarding flexibility versus fidelity and a greater understanding of the unique challenges faced by rural interventions.

This research contributes new knowledge to those working in the areas of welfare, child and adolescent safety, and suicide prevention. The aim of this thesis was to succinctly provide clinicians, government and community agencies, researchers and policy advisors, with a snapshot profile of 2029 welfare seeking young people who were homeless and frequently discouraged by negative life events. The research aim was to identify risk and protective factors that impact life outcomes for those seeking the Independent Youth Benefit (IYB), and particularly, to scrutinize salient factors that led a vulnerable group of IYB applicants to die by suicide. It was further aimed that by documenting comments from 200 young adults from this population across a span of seven years, both gaps within the IYB process, as well as useful resources, could be identified in order to improve life outcomes for other homeless youth. For those who attempted suicide and survived, file records and interviews have indicated the triggers and life histories that potentially impacted their decision to try to end their pain of life, and factors that influenced survival and recovery. Four separate studies were included in this thesis. Study 1 profiled 2029 IYB applicants and determined the most potent risks that led to the granting of the IYB. Study 2 revealed the salient factors that related to the suicide of 6 IYB applicants. Study 3 investigated the outcomes for those who were granted or declined a benefit across the variables of education, employment, income, adverse life circumstances, wellbeing, and family relationships. Study 4 examined a psychological construct, termed cynical distrust, which appeared to be a characteristic trait in welfare seeking youth. Conclusions from this research provided indicators of youth who will usually be granted an IYB, they are, those who report bullying, abuse, parent psychopathology, single parent homes, a parent on a benefit and foster placement. Applicants who reported suicidal thoughts and suicide attempts and had contact with Police and Child Youth and Family Services also were more likely to be granted an Independent Youth Benefit (IYB). If the applicants were Maori and had previously seen a counsellor for a mental health problem, they also were more likely to receive the IYB. However, when applicants were referred to Family Reconciliation Counselling (FRC), there was a statistically significant association between benefit application and benefit declined. A unique finding from this population related to the association of 'unknown fathers' with suicide. Absent father literature is now extensive, however, little research has been conducted into the effects of 'unknown fathers', particularly for Maori youth who place much of their strength and wellbeing in their genealogy. Other salient factors leading to suicide for IYB applicants included, previous suicide attempt, co-morbid disorder, unresolved anger, no identified caring adult, foster placement and an impending legal or disciplinary event. Maori males with such factors posed the greatest risk for suicide. Counsellors, psychologists, families and policy analysts need to acknowledge that IYB applicants who attempted suicide, show cynical distrust, and were declined a benefit, had extremely poor life outcomes. The New Zealand youth welfare system could be functioning far more efficiently if documented recommendations become realities.

The purpose of this research project was to provide an in-depth account of elite athletes' experiences of, and experts' perspectives on, overtraining and its negative outcomes. I conducted interviews with athletes and sports experts, including coaches, sport doctors, scientists, and psychologists across a variety of sports. The interviews were focussed on identifying personal and situational risk factors for overtraining behaviours and outcomes. This thesis includes discussions of the responses to the interviews from the athletes' and the experts' perspectives, with distinct approaches to analysing and presenting the interview data from these two groups' different perspectives. For the 14 experts, I carried out inductive content analyses of the interviews and presented the results in a tree-structure showing the major categories, subcategories, and raw data themes emerging from the data. For the 13 athletes, I used a narrative approach to analysing and presenting their stories, which I aggregated into three core tales, represented by three constructed fictional athletes. From the athletes' stories, I found support for the perspectives presented by the experts. I also uncovered, however, unique accounts of overtraining experiences that provided insight into the intra-psychic conflicts, sometimes obsessive-compulsive features, and complicated relationships of the not-as-perfect-as-perceived-to-be athletes. Taken together, both sets of interviews revealed that overtraining behaviours are significant issues in most sports, whether skill- or effort-based, which may go against traditional conceptions of overtraining. In the general discussion, I present a descriptive model of overtraining risks and outcomes, which came together from the synthesis of the athlete and expert interview results, and, finally, I discuss implications for professional practice and make suggestions for future research.

The wave of knowledge loss that organisations are facing on account of layoffs, retirements, staff turnover and mergers gave rise to this research. The main research aim was to identify the organisational and behavioural factors that could enhance or impede tacit knowledge retention. A multidisciplinary approach focusing on knowledge management, organisational behaviour and organisational development was followed. The nature of knowledge in organisations was explored by following a contextualised theorybuilding process, focusing on epistemology, and the appearance and application of knowledge. Knowledge in the context of this research is the knowledge and experience that reside in the minds of people. It is not easily documented, and is referred to as tacit knowing. A theoretical model was developed that revealed the factors that could influence tacit knowledge retention. The model focused on human input factors taking into account knowledge loss risks, strategic risks and behavioural threats that could cause knowledge loss.The main purpose of the empirical research was to operationalise the theoretically derived knowledge retention constructs, determine statistically the enhancing and impeding factors that influence knowledge retention and develop a structural equation model to verify the theoretical model. A quantitative empirical research paradigm using the survey method was followed. A questionnaire was compiled, and a survey conducted in the water supply industry. The principal component factor analysis postulated nine factors. A composite factor, knowledge retention, as the dependent variable was compiled. The questionnaire was found to be reliable, with a Cronbach alpha coefficient of .975. A structural equation model development strategy produced a new best-fitting knowledge retention model based on the new constructs postulated in the factor analysis. The model indicated that there is a direct causal relationship between strategy implementation and knowledge retention and between knowledge behaviours and knowledge retention. The regression analysis showed that most of the intercorrelations are significant, thus confirming the theory. The research contributed towards a comprehensive understanding of the factors that influence tacit knowledge retention. The questionnaire and the new knowledge retention model could assist organisations in determining the extent to which knowledge is retained and where to focus in developing and implementing a knowledge retention strategy. The study encourages practitioners to take cognisance of the fact that organisations are different and that the enhacing and impeding factors of knowledge retention are to be considered.
Information Science
D. Litt. et Phil. (Information Science)

Many functions that at one time could only be performed by humans can nowadays be carried out by machines. Automation impacts many areas of life including work, home, communication and mobility. In the driving context, in-vehicle automation is considered to provide solutions for environmental, economic, safety and societal challenges. However, automation changes the driving task and the human-machine interaction. Thus, the expected benefit of in-vehicle automation can be undermined by changes in drivers’ behaviour, i.e. behavioural adaptation. This PhD project focuses on motivational as well as higher cognitive processes underlying behavioural adaptation when interacting with in-vehicle automation. Motivational processes include the development of trust and acceptance, whereas higher cognitive processes comprise the learning process as well as the development of mental models and Situation Awareness (SA). As an example for in-vehicle automation, the advanced driver assistance system Adaptive Cruise Control (ACC) was investigated. ACC automates speed and distance control by maintaining a constant set cruising speed and automatically adjusting vehicle’s velocity in order to provide a specified distance to the preceding vehicle. However, due to sensor limitations, not every situation can be handled by the system and therefore driver intervention is required. Trust, acceptance and an appropriate mental model of the system functionality are considered key variables for adequate use and appropriate SA. To systematically investigate changes in motivational and higher cognitive processes, a driving simulator as well as an on-road study were carried out. Both of the studies were conducted using a repeated-measures design, taking into account the process character, i.e. changes over time. The main focus was on the development of trust, acceptance and the mental model of novice users when interacting with ACC. By now, only few studies have attempted to assess changes in higher level cognitive processes, due to methodological difficulties posed by the dynamic task of driving. Therefore, this PhD project aimed at the elaboration and validation of innovative methods for assessing higher cognitive processes, with an emphasis on SA and mental models. In addition, a new approach for analyzing big and heterogeneous data in social science was developed, based on the use of relational databases. The driving simulator study investigated the effect of divergent initial mental models of ACC (i.e., varying according to correctness) on trust, acceptance and mental model evolvement. A longitudinal study design was applied, using a two-way (3×3) repeated measures mixed design with a matched sample of 51 subjects. Three experimental groups received (1) a correct ACC description, (2) an incomplete and idealised account omitting potential problems, and (3) an incorrect description including non-occurring problems. All subjects drove a 56-km track of highway with an identical ACC system, three times, and within a period of 6 weeks. Results showed that after using the system, participants’ mental model of ACC converged towards the profile of the correct group. Non-experienced problems tended to disappear from the mental model network when they were not activated by experience. Trust and acceptance grew steadily for the correct condition. The same trend was observed for the group with non-occurring problems, starting from a lower initial level. Omitted problems in the incomplete group led to a constant decrease in trust and acceptance without recovery. This indicates that automation failures do not negatively affect trust and acceptance if they are known beforehand. During each drive, participants continuously completed a visual secondary task, the Surrogate Reference Task (SURT). The frequency of task completion was used as objective online-measure for SA, based on the principle that situationally aware driver would reduce the engagement in the secondary task if they expect potentially critical situations. Results showed that correctly informed drivers were aware of potential system limitations and reduced their engagement in the secondary task when such situations arose. Participants with no information about limitations became only aware after first encounter and reduced secondary task engagement in corresponding situations during subsequent trials. However, trust and acceptance in the system declined over time due to the unexpected failures. Non occurring limitations tended to drop from the mental model and resulted in reduced SA already in the second trial. The on-road study investigated the learning process, as well as the development of trust, acceptance and the mental model for interacting with ACC in real conditions. Research questions aimed to model the learning process in mathematical/statistical terms, examine moments and conditions when these processes stabilize, and assess how experience changes the mental model of the system. A sample of fifteen drivers without ACC experience drove a test vehicle with ACC ten consecutive times on the same route within a 2-month period. In contrast to the driving simulator study, all participants were fully trained in ACC functionality by reading the owner’s manual in the beginning. Results showed that learning, as well as the development of acceptance and trust in ACC follows the power law of learning, in case of comprehensive prior information on system limitations. Thus, the major part of the learning process occurred during the first interaction with the system and support in explaining the systems abilities (e.g. by tutoring systems) should therefore primarily be given during this first stage. All processes stabilized at a relatively high level after the fifth session, which corresponds to 185 km or 3.5 hours of driving. No decline was observable with ongoing system experience. However, in line with the findings from the simulator study, limitations that are not experienced tended to disappear from the mental model if they were not activated by experience. With regard to the validation of the developed methods for assessing mental models and SA, results are encouraging. The studies show that the mental model questionnaire is able to provide insights into the construction of mental models and the development over time. Likewise, the implicit measurement approach to assess SA online in the driving simulator is sensitive to user’s awareness of potentially critical situations. In terms of content, the results of the studies prove the enduring relevance of the initial mental model for the learning process, SA, as well as the development of trust, acceptance and a realistic mental model about automation capabilities and limitations. Given the importance of the initial mental model it is recommended that studies on system trust and acceptance should include, and attempt to control, users’ initial mental model of system functionality. Although the results showed that also incorrect and incomplete initial mental models converged by experience towards a realistic appreciation of system functionality, the more cognitive effort needed to update the mental model, the lower trust and acceptance. Providing an idealised description, which omits potential problems, only leads to temporarily higher trust and acceptance in the beginning. The experience of unexpected limitations results in a steady decrease in trust and acceptance over time. A trial-and-error strategy for in-vehicle automation use, without accompanying information, is therefore considered insufficient for developing stable trust and acceptance. If the mental model matches experience, trust and acceptance grow steadily following the power law of learning – regardless of the experience of system limitations. Provided that such events are known in advance, they will not cause a decrease in trust and acceptance over time. Even over-information about potential problems lowers trust and acceptance only in the beginning, and not in the long run. Potential problems should therefore not be concealed in over-idealised system descriptions; the more information given, the better, in the long run. However, limitations that are not experienced tend to disappear from the mental model. Therefore, it is recommended that users be periodically reminded of system limitations to make sure that corresponding knowledge becomes re-activated. Intelligent tutoring systems incorporated in automated systems could provide a solution. In the driving context, periodic reminders about system limitations could be shown via the multifunction displays integrated in most modern cars. Tutoring systems could also be used to remind the driver of the presence of specific in-vehicle automation systems and reveal their benefits.:Table of contents LIST OF FIGURES I LIST OF TABLES II LIST OF ABBREVIATIONS III ACKNOWLEDGEMENTS IV SUMMARY V ZUSAMMENFASSUNG VIII 1 INTRODUCTION 12 2 THEORETICAL BACKGROUND 14 2.1 BEHAVIOURAL ADAPTATION AND HIGHER COGNITIVE PROCESSES 14 2.2 VEHICLE AUTOMATION AND ADAPTIVE CRUISE CONTROL 17 2.3 MENTAL MODELS 20 2.3.1 Definition 20 2.3.2 Mental model construction and update 20 2.3.3 Discussion of existing measures 21 2.3.4 Development of the mental model questionnaire 23 2.4 SITUATION AWARENESS 24 2.4.1 Definition 24 2.4.2 Relationship between mental models and Situation Awareness 26 2.4.3 Situation Awareness as comprehension process 27 2.4.4 Discussion of existing measures 27 2.4.5 Development of the Situation Awareness measurement technique 29 2.5 LEARNING, ACCEPTANCE AND TRUST IN AUTOMATION 30 2.5.1 Power law of learning 30 2.5.2 Acceptance 31 2.5.3 Trust in automation 31 2.5.4 Related research on learning, acceptance and trust in ACC 32 3 OVERALL RESEARCH QUESTIONS 34 4 OVERALL METHODOLOGICAL CONSIDERATIONS 35 4.1 DRIVING SIMULATOR STUDIES AND ON-ROAD TESTS 35 4.2 DATABASE-FRAMEWORK FOR DATA STORAGE AND ANALYSIS 37 5 DRIVING SIMULATOR STUDY 42 5.1 AIMS AND RESEARCH QUESTIONS 42 5.2 METHOD AND MATERIAL 43 5.2.1 Sampling and participants 43 5.2.2 Research design and procedure 44 5.2.3 Facilities and driving simulator track 45 5.2.4 Secondary task SURT 46 5.2.5 System description 46 5.2.6 Dependent variables trust, acceptance and mental model 47 5.2.7 Contrast analysis 48 5.3 RESULTS 49 5.3.1 Mental model 49 5.3.2 Trust and acceptance 51 5.3.3 Situation Awareness 52 5.4 DISCUSSION 56 6 ON-ROAD STUDY 59 6.1 AIMS AND RESEARCH QUESTIONS 59 6.2 METHOD AND MATERIAL 59 6.2.1 Research design and procedure 59 6.2.2 Sampling and participants 60 6.2.3 Facilities and apparatus 60 6.2.4 Dependent variables mental model, trust, acceptance, learning and ACC usage 62 6.3 RESULTS 63 6.3.1 ACC usage 63 6.3.2 Trust and acceptance 64 6.3.3 Learning 65 6.3.4 Mental model 67 6.4 DISCUSSION 68 7 GENERAL DISCUSSION AND CONCLUSIONS 70 7.1 THEORETICAL AND PRACTICAL CONSIDERATIONS 70 7.2 METHODOLOGICAL CONSIDERATIONS 71 7.3 LIMITATIONS AND DIRECTIONS FOR FUTURE RESEARCH 74 8 REFERENCES 76 9 APPENDIX 88 9.1 QUESTIONNAIRES USED IN THE DRIVING SIMULATOR STUDY 88 9.1.1 Original German version 88 9.1.2 English translation 91 9.2 ACC DESCRIPTIONS USED IN THE DRIVING SIMULATOR STUDY 94 9.2.1 Correct description 94 9.2.2 Incomplete description 95 9.2.3 Incorrect description 96 9.3 SCHEMATIC OVERVIEW OF THE DRIVING SIMULATOR TRACK 97 9.4 QUESTIONNAIRES USED IN THE ON-ROAD STUDY 99 9.4.1 Original German version 99 9.4.2 English translation 103 9.5 SEMINAR PROGRAMME: DATABASES AS ANALYSIS TOOL IN SOCIAL SCIENCE 107 9.6 CURRICULUM VITAE AND PUBLICATIONS 109
Viele Aufgaben, die ehemals von Menschen ausgeführt wurden, werden heute von Maschinen übernommen. Dieser Prozess der Automatisierung betrifft viele Lebensbereiche von Arbeit, Wohnen, Kommunikation bis hin zur Mobilität. Im Bereich des Individualverkehrs wird die Automatisierung von Fahrzeugen als Möglichkeit gesehen, zukünftigen Herausforderungen wirtschaftlicher, gesellschaftlicher und umweltpolitischer Art zu begegnen. Allerdings verändert Automatisierung die Fahraufgabe und die Mensch-Technik Interaktion im Fahrzeug. Daher können beispielsweise erwartete Sicherheitsgewinne automatisch agierender Assistenzsysteme durch Veränderungen im Verhalten des Fahrers geschmälert werden, was als Verhaltensanpassung (behavioural adaptation) bezeichnet wird. Dieses Dissertationsprojekt untersucht motivationale und höhere kognitive Prozesse, die Verhaltensanpassungen im Umgang mit automatisierten Fahrerassistenzsystemen zugrunde liegen. Motivationale Prozesse beinhalten die Entwicklung von Akzeptanz und Vertrauen in das System, unter höheren kognitiven Prozessen werden Lernprozesse sowie die Entwicklung von mentalen Modellen des Systems und Situationsbewusstsein (Situation Awareness) verstanden. Im Fokus der Untersuchungen steht das Fahrerassistenzsystem Adaptive Cruise Control (ACC) als ein Beispiel für Automatisierung im Fahrzeug. ACC regelt automatisch die Geschwindigkeit des Fahrzeugs, indem bei freier Fahrbahn eine eingestellte Wunschgeschwindigkeit und bei einem Vorausfahrer automatisch ein eingestellter Abstand eingehalten wird. Allerdings kann ACC aufgrund von Einschränkungen der Sensorik nicht jede Situation bewältigen, weshalb der Fahrer übernehmen muss. Für diesen Interaktionsprozess spielen Vertrauen, Akzeptanz und das mentale Modell der Systemfunktionalität eine Schlüsselrolle, um einen sicheren Umgang mit dem System und ein adäquates Situationsbewusstsein zu entwickeln. Zur systematischen Erforschung dieser motivationalen und kognitiven Prozesse wurden eine Fahrsimulatorstudie und ein Versuch im Realverkehr durchgeführt. Beide Studien wurden im Messwiederholungsdesign angelegt, um dem Prozesscharakter gerecht werden und Veränderungen über die Zeit erfassen zu können. Die Entwicklung von Vertrauen, Akzeptanz und mentalem Modell in der Interaktion mit ACC war zentraler Forschungsgegenstand beider Studien. Bislang gibt es wenige Studien, die kognitive Prozesse im Kontext der Fahrzeugführung untersucht haben, unter anderem auch wegen methodischer Schwierigkeiten in diesem dynamischen Umfeld. Daher war es ebenfalls Teil dieses Dissertationsprojekts, neue Methoden zur Erfassung höherer kognitiver Prozesse in dieser Domäne zu entwickeln, mit Fokus auf mentalen Modellen und Situationsbewusstsein. Darüber hinaus wurde auch ein neuer Ansatz für die Analyse großer und heterogener Datenmengen im sozialwissenschaftlichen Bereich entwickelt, basierend auf dem Einsatz relationaler Datenbanken. Ziel der der Fahrsimulatorstudie war die systematische Erforschung des Effekts von unterschiedlich korrekten initialen mentalen Modellen von ACC auf die weitere Entwicklung des mentalen Modells, Vertrauen und Akzeptanz des Systems. Eine Stichprobe von insgesamt 51 Probanden nahm an der Studie teil; der Versuch wurde als zweifaktorielles (3x3) gemischtes Messwiederholungsdesign konzipiert. Die 3 parallelisierten Versuchsgruppen zu je 17 Personen erhielten (1) eine korrekte Beschreibung des ACC, (2) eine idealisierte Beschreibung unter Auslassung auftretender Systemprobleme und (3) eine überkritische Beschreibung mit zusätzlichen Hinweisen auf Systemprobleme, die nie auftraten. Alle Teilnehmer befuhren insgesamt dreimal im Zeitraum von sechs Wochen dieselbe 56 km lange Autobahnstrecke im Fahrsimulator mit identischem ACC-System. Mit zunehmendem Einsatz des ACC zeigte sich im anfänglich divergierenden mentalen Modell zwischen den Gruppen eine Entwicklung hin zum mentalen Modell der korrekt informierten Gruppe. Nicht erfahrene Systemprobleme tendierten dazu, im mentalen Modell zu verblassen, wenn sie nicht durch Erfahrung reaktiviert wurden. Vertrauen und Akzeptanz stiegen stetig in der korrekt informierten Gruppe. Dieselbe Entwicklung zeigte sich auch in der überkritisch informierten Gruppe, wobei Vertrauen und Akzeptanz anfänglich niedriger waren als in der Bedingung mit korrekter Information. Verschwiegene Systemprobleme führten zu einer konstanten Abnahme von Akzeptanz und Vertrauen ohne Erholung in der Gruppe mit idealisierter Beschreibung. Diese Resultate lassen darauf schließen, dass Probleme automatisierter Systeme sich nicht zwingend negativ auf Vertrauen und Akzeptanz auswirken, sofern sie vorab bekannt sind. Bei jeder Fahrt führten die Versuchsteilnehmer zudem kontinuierlich eine visuell beanspruchende Zweitaufgabe aus, die Surrogate Reference Task (SURT). Die Frequenz der Zweitaufgabenbearbeitung diente als objektives Echtzeitmaß für das Situationsbewusstsein, basierend auf dem Ansatz, dass situationsbewusste Fahrer die Zuwendung zur Zweitaufgabe reduzieren wenn sie potentiell kritische Situationen erwarten. Die Ergebnisse zeigten, dass die korrekt informierten Fahrer sich potentiell kritischer Situationen mit möglichen Systemproblemen bewusst waren und schon im Vorfeld der Entstehung die Zweitaufgabenbearbeitung reduzierten. Teilnehmer ohne Informationen zu auftretenden Systemproblemen wurden sich solcher Situationen erst nach dem ersten Auftreten bewusst und reduzierten in entsprechenden Szenarien der Folgefahrten die Zweitaufgabenbearbeitung. Allerdings sanken Vertrauen und Akzeptanz des Systems aufgrund der unerwarteten Probleme. Erwartete, aber nicht auftretende Systemprobleme tendierten dazu, im mentalen Modell des Systems zu verblassen und resultierten in vermindertem Situationsbewusstsein bereits in der zweiten Fahrt. Im Versuch unter Realbedingungen wurden der Lernprozesses sowie die Entwicklung des mentalen Modells, Vertrauen und Akzeptanz von ACC im Realverkehr erforscht. Ziele waren die statistisch/mathematische Modellierung des Lernprozesses, die Bestimmung von Zeitpunkten der Stabilisierung dieser Prozesse und wie sich reale Systemerfahrung auf das mentale Modell von ACC auswirkt. 15 Versuchsteilnehmer ohne ACC-Erfahrung fuhren ein Serienfahrzeug mit ACC insgesamt 10-mal auf der gleichen Strecke in einem Zeitraum von 2 Monaten. Im Unterschied zur Fahrsimulatorstudie waren alle Teilnehmer korrekt über die ACC-Funktionen und Funktionsgrenzen informiert durch Lesen der entsprechenden Abschnitte im Fahrzeughandbuch am Beginn der Studie. Die Ergebnisse zeigten, dass der Lernprozess sowie die Entwicklung von Akzeptanz und Vertrauen einer klassischen Lernkurve folgen – unter der Bedingung umfassender vorheriger Information zu Systemgrenzen. Der größte Lernfortschritt ist am Beginn der Interaktion mit dem System sichtbar und daher sollten Hilfen (z.B. durch intelligente Tutorsysteme) in erster Linie zu diesem Zeitpunkt gegeben werden. Eine Stabilisierung aller Prozesse zeigte sich nach der fünften Fahrt, was einer Fahrstrecke von rund 185 km oder 3,5 Stunden Fahrzeit entspricht. Es zeigten sich keine Einbrüche in Akzeptanz, Vertrauen bzw. dem Lernprozess durch die gemachten Erfahrungen im Straßenverkehr. Allerdings zeigte sich – analog zur Fahrsimulatorstudie – auch in der Realfahrstudie ein Verblassen von nicht erfahrenen Systemgrenzen im mentalen Modell, wenn diese nicht durch Erfahrungen aktiviert wurden. Im Hinblick auf die Validierung der neu entwickelten Methoden zur Erfassung von mentalen Modellen und Situationsbewusstsein sind die Resultate vielversprechend. Die Studien zeigen, dass mit dem entwickelten Fragebogenansatz zur Quantifizierung des mentalen Modells Einblicke in Aufbau und Entwicklung mentaler Modelle gegeben werden können. Der implizite Echtzeit-Messansatz für Situationsbewusstsein im Fahrsimulator zeigt sich ebenfalls sensitiv in der Erfassung des Bewusstseins von Fahrern für potentiell kritische Situationen. Inhaltlich zeigen die Studien die nachhaltige Relevanz des initialen mentalen Modells für den Lernprozess sowie die Entwicklung von Situationsbewusstsein, Akzeptanz, Vertrauen und die weitere Ausformung eines realistischen mentalen Modells der Möglichkeiten und Grenzen automatisierter Systeme. Aufgrund dieser Relevanz wird die Einbindung und Kontrolle des initialen mentalen Modells in Studien zu automatisierten Systemen unbedingt empfohlen. Die Ergebnisse zeigen zwar, dass sich auch unvollständige bzw. falsche mentale Modelle durch Erfahrungslernen hin zu einer realistischen Einschätzung der Systemmöglichkeiten und -grenzen verändern, allerdings um den Preis sinkenden Vertrauens und abnehmender Akzeptanz. Idealisierte Systembeschreibungen ohne Hinweise auf mögliche Systemprobleme bringen nur anfänglich etwas höheres Vertrauen und Akzeptanz. Das Erleben unerwarteter Probleme führt zu einem stetigen Abfall dieser motivationalen Faktoren über die Zeit. Ein alleiniges Versuchs-Irrtums-Lernen für den Umgang mit automatisierter Assistenz im Fahrzeug ohne zusätzliche Information wird daher als nicht ausreichend für die Entwicklung stabilen Vertrauens und stabiler Akzeptanz betrachtet. Wenn das initiale mentale Modell den Erfahrungen entspricht, entwickeln sich Akzeptanz und Vertrauen gemäß einer klassischen Lernkurve – trotz erlebter Systemgrenzen. Sind diese potentiellen Probleme vorher bekannt, führen sie nicht zwingend zu einer Reduktion von Vertrauen und Akzeptanz. Auch zusätzliche überkritische Information vermindert Vertrauen und Akzeptanz nur am Beginn, aber nicht langfristig. Daher sollen potentielle Probleme in automatisierten Systemen nicht in idealisierten Beschreibungen verschwiegen werden – je präzisere Information gegeben wird, desto besser im langfristigen Verlauf. Allerdings tendieren nicht erfahrene Systemgrenzen zum Verblassen im mentalen Modell. Daher wird empfohlen, Nutzer regelmäßig an diese Systemgrenzen zu erinnern um die entsprechenden Facetten des mentalen Modells zu reaktivieren. In automatisierten Systemen integrierte intelligente Tutorsysteme könnten dafür eine Lösung bieten. Im Fahrzeugbereich könnten solche periodischen Erinnerungen an Systemgrenzen in Multifunktionsdisplays angezeigt werden, die mittlerweile in vielen modernen Fahrzeugen integriert sind. Diese Tutorsysteme können darüber hinaus auch auf die Präsenz eingebauter automatisierter Systeme hinweisen und deren Vorteile aufzeigen.:Table of contents LIST OF FIGURES I LIST OF TABLES II LIST OF ABBREVIATIONS III ACKNOWLEDGEMENTS IV SUMMARY V ZUSAMMENFASSUNG VIII 1 INTRODUCTION 12 2 THEORETICAL BACKGROUND 14 2.1 BEHAVIOURAL ADAPTATION AND HIGHER COGNITIVE PROCESSES 14 2.2 VEHICLE AUTOMATION AND ADAPTIVE CRUISE CONTROL 17 2.3 MENTAL MODELS 20 2.3.1 Definition 20 2.3.2 Mental model construction and update 20 2.3.3 Discussion of existing measures 21 2.3.4 Development of the mental model questionnaire 23 2.4 SITUATION AWARENESS 24 2.4.1 Definition 24 2.4.2 Relationship between mental models and Situation Awareness 26 2.4.3 Situation Awareness as comprehension process 27 2.4.4 Discussion of existing measures 27 2.4.5 Development of the Situation Awareness measurement technique 29 2.5 LEARNING, ACCEPTANCE AND TRUST IN AUTOMATION 30 2.5.1 Power law of learning 30 2.5.2 Acceptance 31 2.5.3 Trust in automation 31 2.5.4 Related research on learning, acceptance and trust in ACC 32 3 OVERALL RESEARCH QUESTIONS 34 4 OVERALL METHODOLOGICAL CONSIDERATIONS 35 4.1 DRIVING SIMULATOR STUDIES AND ON-ROAD TESTS 35 4.2 DATABASE-FRAMEWORK FOR DATA STORAGE AND ANALYSIS 37 5 DRIVING SIMULATOR STUDY 42 5.1 AIMS AND RESEARCH QUESTIONS 42 5.2 METHOD AND MATERIAL 43 5.2.1 Sampling and participants 43 5.2.2 Research design and procedure 44 5.2.3 Facilities and driving simulator track 45 5.2.4 Secondary task SURT 46 5.2.5 System description 46 5.2.6 Dependent variables trust, acceptance and mental model 47 5.2.7 Contrast analysis 48 5.3 RESULTS 49 5.3.1 Mental model 49 5.3.2 Trust and acceptance 51 5.3.3 Situation Awareness 52 5.4 DISCUSSION 56 6 ON-ROAD STUDY 59 6.1 AIMS AND RESEARCH QUESTIONS 59 6.2 METHOD AND MATERIAL 59 6.2.1 Research design and procedure 59 6.2.2 Sampling and participants 60 6.2.3 Facilities and apparatus 60 6.2.4 Dependent variables mental model, trust, acceptance, learning and ACC usage 62 6.3 RESULTS 63 6.3.1 ACC usage 63 6.3.2 Trust and acceptance 64 6.3.3 Learning 65 6.3.4 Mental model 67 6.4 DISCUSSION 68 7 GENERAL DISCUSSION AND CONCLUSIONS 70 7.1 THEORETICAL AND PRACTICAL CONSIDERATIONS 70 7.2 METHODOLOGICAL CONSIDERATIONS 71 7.3 LIMITATIONS AND DIRECTIONS FOR FUTURE RESEARCH 74 8 REFERENCES 76 9 APPENDIX 88 9.1 QUESTIONNAIRES USED IN THE DRIVING SIMULATOR STUDY 88 9.1.1 Original German version 88 9.1.2 English translation 91 9.2 ACC DESCRIPTIONS USED IN THE DRIVING SIMULATOR STUDY 94 9.2.1 Correct description 94 9.2.2 Incomplete description 95 9.2.3 Incorrect description 96 9.3 SCHEMATIC OVERVIEW OF THE DRIVING SIMULATOR TRACK 97 9.4 QUESTIONNAIRES USED IN THE ON-ROAD STUDY 99 9.4.1 Original German version 99 9.4.2 English translation 103 9.5 SEMINAR PROGRAMME: DATABASES AS ANALYSIS TOOL IN SOCIAL SCIENCE 107 9.6 CURRICULUM VITAE AND PUBLICATIONS 109

Within athletic domains, athletic identity is a cognitive structure guiding and organising how the person processes self-related information (Brewer, Van Raalte, & Linder, 1993). Being one of the domains of the self-concept, athletic identity is the “degree of importance, strength, and exclusivity attached to the athlete role that is maintained by the athletes and influenced by environment” (p. 39; Cieslak, 2005). Previous studies have shown that athletic identity is related to various psychological processes such as identity foreclosure and the emotional reactions of athletes to injuries (Grove, Lavallee, & Gordon, 1997). The Athletic Identity Measurement Scale (AIMS) is a 10-item quantitative inventory measuring the level of athletic identity (Brewer, Van Raalte, & Linder, 1993). Throughout the past decade, researchers have been examining the psychometric properties and factor structures of the AIMS with samples mainly from English-speaking societies (Brewer & Cornelius, 2001; Hale, James, & Stambulova, 1999). This thesis consisted of two studies. The first one investigated the internal consistency and factor structure of the AIMS within a Hong Kong Chinese sample by performing confirmatory factor analyses (CFAs) and Cronbach’s alphas. The author constructed a Chinese version of the AIMS and administered it to 186 Hong Kong athletes. The CFAs showed that multi-dimensional models were better fits than the original unidimenional model. The goodness-of-fit indices of three previously suggested models (and one simplified model) were either above or extremely close to acceptable levels. Considering the possible cultural influences and translation processes, the findings are substantial. In this study, the author also discusses the cultural differences in terms of each factor and overall athletic identity scores. The second study followed up the results of the first study and further explored the construct of athletic identity through qualitative interviews. The author, who was also the interviewer, recruited 13 Hong Kong athletes for in-depth interviews exploring their life experiences of being athletes in Hong Kong. The results revealed that some contributing elements of the participants’ athletic identities seemed well represented by the AIMS items and factors, such as recognition from others (i.e., social identity), sport-related goals, dysphoric emotions associated with injury (i.e., negative affectivity), and perceived importance of sport (i.e., exclusivity). Some themes from the interviews, however, were not represented in the items or factors of the AIMS. For some participants, appearance and accoutrements, such as clothing and equipment, formed part of their overall athletic identities. Also, the author found that the participants’ fantasies about professional athletes were major features of the interviews. These results showed that various cultural characteristics in Hong Kong may influence the development of the participants’ self-identities including athletic identities. The author employed the theory of self-construals (Markus & Kitayama, 1991) and features of Hong Kong culture to explain the results. In the general discussion, the author also discussed the AIMS items, the factor structure, and their connections with Hong Kong athletes’ experiences, based on the qualitative findings. The author recommended some possible items for further development of the AIMS.