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1
Desanghere, Loni. "Gaze strategies in perception and action." Experimental Brain Research, 2011. http://hdl.handle.net/1993/17898.
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When you want to pick up an object, it is usually a simple matter to reach out to its location, and accurately pick it up. Almost every action in such a sequence is guided and checked by vision, with eye movements usually preceding motor actions (Hayhoe & Ballard, 2005; Hayhoe, Shrivastava, Mruczek, & Pelz, 2003). However, most research in this area has been concerned about the sequence of movements in complex “everyday” tasks like making tea or tool use. Less emphasis has been placed on the object itself and where on it the eye and hand movements land, and how gaze behaviour is different when generating a perceptual response to that same object. For those studies that have, very basic geometric shapes have been used such as rectangles, crosses and triangles. In everyday life, however, there are a range of problems that must be computed that go beyond such simple objects. Objects typically have complex contours, different textures or surface properties, and variations in their centre of mass.
Accordingly, the primary goals in conducting this research were three fold: (1) To provide a deeper understanding of the function of gaze in perception and action when interacting with simple and complex objects (Experiments 1a, 1b, 1c); (2) To examine how gaze and grasp behaviours are influenced when you dissociate important features of an object such as the COM and the horizontal centre of the block (Experiments 2a, 2c); and (3) To explore whether perceptual biases will influence grasp and gaze behaviours (Experiment 2b).
The results from the current series of studies showed the influence of action (i.e., the potential to act) on perception in terms of where we look on an object, and vice versa, the influence of perceptual biases on action output (i.e. grasp locations). In addition, grasp locations were found to be less sensitive to COM changes than previously suggested (for example see Kleinholdermann, Brenner, Franz, & Smeets, 2007), whereas fixation locations were drawn towards the ‘visual’ COM of objects, as shown in other perceptual studies (for example see He & Kowler, 1991; Kowler & Blaser, 1995; McGowan, Kowler, Sharma, & Chubb, 1998; Melcher & Kowler, 1999; Vishwanath & Kowler, 2003, 2004; Vishwanath, Kowler, & Feldman, 2000), even when a motor response was required. The implications of these results in terms of vision for Perception and vision for Action are discussed.
2
Roche, Aidan Dominic. "Hand movement, perception, control, imitation & neural activity." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501780.
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Seol, Mun-Su. "Perception of safety and usability of powered hand tools." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4269.
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Thesis (M.S.)--West Virginia University, 2005.Title from document title page. Document formatted into pages; contains viii, 73 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 54-57).
4
Morioka, Miyuki. "Psychophysical investigation of the perception of hand-transmitted vibration." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484260.
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Rossell, Melinda S. "When is Perception Everything? Examining Nurse Perception of Shift-to-Shift Hand-off Report." Thesis, Carlow University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10812598.
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Despite concerted efforts to improve the process of shift-to-shift hand-off report (SHR), challenges and barriers continue to threaten the integrity of information shared between nurses. Research studies have demonstrated that vulnerabilities in SHR have been associated with clinical practice demographic factors, lack of a standardized process and tools, and differences in perceived value of SHR.
A quantitative, descriptive, cross-sectional study was conducted to identify nurse perception of SHR processes, factors that influence nurse perception of SHR, and nurse perception of bedside shift report (BSR) versus alternative SHR methods. Participants included a convenience sample of registered nursing students (n=49) enrolled in RN-BSN or MSN programs at a private southwestern Pennsylvania university. Descriptive statistics, ANOVA, and two independent t-Tests were used to analyze data collected from the Handover Evaluation Scale.
Study results revealed there was no statistically significant difference between nurse perception of SHR processes, demographic factors that influence SHR, and the locality of SHR (BSR). In addition, the majority of nurses identified a reluctance to change current practice of conducting the SHR process. There was no identified association between nurse perception of the quality of information (p=.22), interaction and support (p=.96), or efficiency (p=.17) of SHR.
As nurses are key stakeholders in the transfer of crucial up-to-date patient care information, nurse perception of the SHR needs to be further examined and evaluated to improve patient care outcomes. Quality assurance measures are the hallmark of standardized processes to ensure the delivery of safe and effective care.
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Bowersox, Maryann. "A Nurse's Perception of Hand-Off Communication Before and After Utilization of the I-5 Verification of Information Tool." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/1815.
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Abstract
Miscommunication or omission of critical patient information contributes to preventable
medical errors that result in 98,000 patient deaths each year. The hand-off
communication process creates a critical time for the patient as necessary information for
the continuity of care must be communicated. The purpose of this practice project was to
evaluate the nurses' perception of the current hand-off communication process before and
after an educational intervention and implementation of the I-5 Verification of
Information Tool. Registered nurses were asked to complete a pre survey of their
perception of the current hand-off communication process, followed by an educational
power point describing the I-5 Verification of Information Tool. Participants utilized the
I-5 Verification of Information Tool during hand-off over a 3-week period, and then were
asked to complete a post survey to evaluate the nurses' perception of the hand-off process
including of the I-5 Verification of Information Tool. A paired t test was used to
determine if there was a difference in the nurses' perception of the current hand-off
communication process before and after an educational intervention and implementation
of the I-5 Verification of Information Tool. Although there was no statistically significant
difference in the pre- and post-survey scores, post survey results demonstrated clinical
significance. This project has implications for positive social change by addressing nurse
communication as a method to improve the quality of hand-off reports, which has the
potential to reduce medical errors and improve patient outcomes.
7
Rodriguez, Maria. "TIME ESTIMATION AND HAND PREFERENCE." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3895.
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This work examines the effect of participants' gender and handedness on the perception of short intervals of time. The time estimation task consisted of an empty production procedure with forty trials at each of four intervals of one, three, seven, and twenty seconds. The four target intervals represent a natural logarithmic progression and a series that bracket important temporal thresholds. The order of presentation of those intervals was randomized across participants but yoked across the sexes in each of the respective dominant hand groups. The two between-subject factors, with two levels each, were sex and handedness. Participants produced forty estimates at each of the required intervals, which was the first within-subject factor, estimated interval being the other. T-tests were conducted on the dependent measures, the time estimates in terms of their variability and their central tendency with respect to the target duration. If handedness plays a significant role in timing, this may indicate differences between hemispheric functioning as a possible causal mechanism. If there is cerebral asymmetry in time perception, namely if one hemisphere is more competent regarding time perception, accuracy in judging duration should be higher for the contralateral hand. The results of the present study indicated that there are no significant differences in performance between right-handed and left-handed participants, or between male and female participants, in the estimation of short intervals of time.Ph.D.
Department of Psychology
Arts and Sciences
Psychology
8
Liu, Jian. "Adaptive hand grasp in a multi-digit prosthesis with active perception." Thesis, Open University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434228.
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Irizarry, Justin Lee. "Hand Amputees have an Altered Perception of Images at Arm's Length." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc28435/.
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The preface to this collection "Dust Clouding: Ambiguity and the Poetic Image," highlights the ways in which poets such as W.S Merwin and Donald Revell use ambiguity and the poetic image to strengthen their poems and encourage equality between reader and writer. Hand Amputees have an Altered Perception of Images at Arm's Length is a collection of poems and poem like adventures.
10
COZER, CAMILA. "CONSUMER'S PERCEPTION AND PURCHASE INTENTIONS : A QUALITATIVE STUDY ON SECOND-HAND CLOTHING STORES." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Företagsekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-39668.
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Jubran, Rachel, Hannah White, Alyson Chroust, Alison Heck, and Ramesh S. Bhatt. "Experimental Evidence of Structural Representation of Hands in Early Infancy." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/2731.
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Hands convey important social information, such as an individual’s emotions, goals, and desires, are used to direct attention through pointing, and are a major organ for haptic perception. However, very little is known about infants’ representation of human hands. In Experiment 1, infants tested in a familiarization/novelty preference task discriminated between images of intact hands and images that contained first-order structure distortions (i.e., with locations of fingers altered to result in an unnatural configuration). In Experiment 2, infants tested in a spontaneous preference task exhibited a preference for scrambled hand images over intact images, indicating that 3.5-month-olds have gained sufficient sensitivity to the configural properties of hands to discriminate between intact versus scrambled images without any training in the laboratory. In both procedures, infants’ performance was disrupted by the inversion of images, suggesting that infants’ performance in upright conditions was not based on low-level features. These results indicate that sensitivity to the structure of hands develops early in life. This may lay the foundation for the development of the functional use of hand information for social communication.
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Dreijer, Janto F. "Interactive recognition of hand-drawn circuit diagrams." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2477.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.When designing electronic circuits, engineers frequently make hand-drawn sketches of circuits. These are then captured with a computerised design. This study aims to create an alternative to the common schematic capture process through the use of an interactive pen-based interface to the capturing software. Sketches are interpreted through a process of vectorising the user’s strokes into primitive shapes, extracting information on intersections between primitives and using a naive Bayesian classifier to identify symbol components. Various alternative approaches were also considered. It is concluded that it is feasible to use a pen-based interface and underlying recognition engine to capture circuit diagrams. It is hoped that this would provide an attractive early design environment for the engineer and enhance productivity.
13
Parekh, Gaurav. "Scene matching between a quantitative map and a qualitative hand drawn sketch." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5048.
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Thesis (M.S.)--University of Missouri-Columbia, 2007.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on November 12, 2008) Includes bibliographical references.
14
Lewis, Elizabeth. "A mixed method investigation of the Rubber Hand Illusion." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/a-mixed-method-investigation-of-the-rubber-hand-illusion(e2d6456f-c093-4061-bd16-12e854915639).html.
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Embodiment is the experience of one's own body. It is often studied using the Rubber Hand Illusion (RHI). This illusion varies the consistency between visual, tactile and proprioceptive signals to elicit a change to embodiment. Changes to embodiment are typically measured using a single sensory outcome measure of proprioceptive drift, which is interpreted as a proxy measure of embodiment. This approach obscures the unique contribution of other modalities such as vision and touch. The work presented in this thesis uses a mixed method approach to investigate the unique contribution of visual, tactile and proprioceptive modalities within the multisensory process of embodiment. In study one, a qualitative analysis showed that when visual-tactile discrepancies were present in the RHI, participants described both body ownership and body extension type changes to embodiment, and changes to tactile perception. In study two, psychophysical measurements of the RHI showed changes to visual, tactile and proprioceptive aspects of embodiment, suggesting that embodiment in the RHI could be measured using multiple sensory outcomes. Studies three and four assessed the utility of measuring multiple sensory outcomes of the RHI, by exploring changes to embodiment following internal and external forms of body perception training. Study three showed that brief body scan meditation, as a form of internal body perception training, reduced the longevity of the visual sensory outcome of the RHI and that this reduction was negatively correlated with improvements in interoceptive sensitivity. Study four showed that learning about the body through anatomical dissection training, as a form of external body perception training, reduced the longevity of the visual sensory outcome measure and decreased interoceptive sensitivity, but only in medical students who were high in trait personal distress. Collectively, these findings suggest that aspects of the multisensory processes of embodiment can become specialised and identify some unique contributions of individual sensory modalities to embodiment. The proprioceptive sensory outcome appears to be stable over time but the visual sensory outcome is a longer-term change to embodiment, which is susceptible to interference from body perception training. In study five, confirmatory factor analysis was used to assess the psychometric properties of an embodiment change questionnaire measuring body ownership, body extension and perceived causality in the RHI. Factor scores from the questionnaire were correlated with visual and proprioceptive outcome measures of the RHI and measures of trait empathy. The results suggested factor scores had better convergent validity than the standard illusion score used in previous research. This work has improved subjective and perceptual measures of the RHI and specified ways that individual sensory modalities provide a unique contribution to embodiment. The methods developed have further applications for studying the multisensory process of embodiment and investigating embodiment in a number of clinical groups.
15
Ciechomska, Agata. "COLOUR IN LOOPS : Exploring colour perception in relation to lightin weaving and hand-tufting technique." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12684.
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The motivation for this MA work is based on the challenge to the preconception of hand-tufting through material, colour and light. When imagining a rug, a very specific image appears in our mind. Some details of that image could vary from person to person, but what is almost certain, dense and heavy, probably made out of wool, woven textile will pop up in front of our eyes. This work suggests a possibility of creating new expressions in design by the material driven approach. The investigation was led by practice based research including set up of experiments, experimental work and evaluation complementing the whole process. The exploration proved that qualities of monofilament yarn have a great ability to enhance colours as well as add certain kind of lightness to the hand-tufted piece. Furthermore, due to the transparency of monofilament yarn an interplay between the loops and the backing was possible, opening up for changes in colour perception. The outcome of the research is collection of woven and hand-tufted textiles contributing to the field of textiles by bringing new qualities to the hand-tufting technique.
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Cooper, Jehangir. "Heuristics: Bias Vs. Smart Instrument. An Exploration of the Hot Hand." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1377092070.
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Johnston, Tiffany Christine. "Nursing Bedside Report: Improving Perception with a Standardized Tool." Mount St. Joseph University Dept. of Nursing / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=msjdn1588867237573072.
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Mallon, Kelsey N. "Altering the Gag Reflex via a Hand Pressure Device: Perceptions of Pressure." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1398622026.
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Säfström, Daniel. "Sensorimotor transformations during grasping movements /." Umeå : Department of Integrative Medical Biology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-781.
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White, R. C. "When I touch my hand it touches me back : an investigation of the illusion of self-touch." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:a0875564-2d81-4306-84f9-894213554046.
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Following stroke, a patient may fail to report touch administered by another person but claim that s/he feels touch when it is self-administered. In Part One, the self-touch rubber hand paradigm was used to investigate different explanations for this phenomenon, termed self-touch enhancement. The most important finding was that patients reported touch based on feeling rather than by using proprioceptive information. Some patients have residual sensation that could be targeted in sensory rehabilitation. Part Two is a systematic investigation of the illusion of self-touch conducted with neurologically healthy participants. Participants used the right hand to administer touch to a prosthetic hand while the left (receptive) hand, positioned 15 cm from the prosthetic hand, received Examiner-administered touch. Proprioceptively perceived position of the administering and receptive hand was measured. Most participants experienced the single event of self-touch at the location of the receptive hand. Previous investigations have relied on measurement of only one hand and have concluded that participants experience self-touch at the location of the prosthetic hand. Our findings have implications for the role of ownership in this illusion. There is also a series of experiments in Part Two which test four potential constraints on the illusion of self-touch – violated expectations about the object that is administering touch, increased distance between the hands, alignment mismatch, and anatomical implausibility. For example, one study uses a novel paradigm to demonstrate that, although the subjective intensity of the illusion of self-touch is diminished by anatomical implausibility, most participants report the impossible experience of touching their left elbow with their own left index finger. Taken together, these experiments highlight the malleability of body representation, and provide a comprehensive framework for understanding the illusion of self-touch.
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Ruot, Charles W. "A study of the relationship between golf performance and depth perception, arm/hand steadiness, grip strength and dynamic balance /." View online, 1987. http://repository.eiu.edu/theses/docs/32211998881753.pdf.
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Jeon, Byung Ho. "Proposed automobile steering wheel test method for vibration." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4623.
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This thesis proposes a test method for evaluating the perceived vibration which occurs at the driver's hand in automotive steering wheel interface. The objective of the research was to develop frequency weightings for quantifying the human perception of steering wheel hand-arm vibration. Family of frequency weightings were developed from equal sensation curves obtained from the psychophysical laboratory experimental tests. The previous literature suggests that the only internationally standardised frequency weighting Wh is not accurate to predict human perception of steering wheel hand-arm vibration (Amman et. al, 2005) because Wh was developed originally for health effects, not for the human perception. In addition, most of the data in hand-arm vibration are based upon responses from male subjects (Neely and Burström, 2006) and previous studies based only on sinusoidal stimuli. Further, it has been continuously suggested by researchers (Gnanasekarna et al., 2006; Morioka and Griffin, 2006; Ajovalasit and Giacomin, 2009) that only one weighting is not optimal to estimate the human perception at all vibrational magnitudes. In order to address these problems, the investigation of the effect of gender, body mass and the signal type on the equal sensation curves has been performed by means of psychophysical laboratory experimental tests. The test participants were seated on a steering wheel simulator which consists of a rigid frame, a rigid steering wheel, an automobile seat, an electrodynamic shaker unit, a power amplifier and a signal generator. The category-ratio Borg CR10 scale procedure was used to quantify the perceived vibration intensity. A same test protocol was used for each test and for each test subject. The first experiment was conducted to investigate the effect of gender using sinusoidal vibration with 40 test participants (20 males and 20 females). The results suggested that the male participants provided generally lower subjective ratings than the female participants. The second experiment was conducted using band-limited random vibration to investigate the effect of signal type between sinusoidal and band-limited random vibration with 30 test participants (15 males and 15 females). The results suggested that the equal sensation curves obtained using random vibration were generally steeper and deeper in the shape of the curves than those obtained using sinusoidal vibration. These differences may be due to the characteristics of random vibration which produce generally higher crest factors than sinusoidal vibration. The third experiment was conducted to investigate the effect of physical body mass with 40 test participants (20 light and 20 heavy participants) using sinusoidal vibration. The results suggested that the light participants produced generally higher subjective ratings than the heavy participants. From the results it can be suggested that the equal sensation curves for steering wheel rotational vibration differ mainly due to differences of body size rather than differences of gender. The final experiments was conducted using real road signals to quantify the human subjective response to representative driving condition and to use the results to define the selection method for choosing the adequate frequency weightings for the road signals by means of correlation analysis. The final experiment was performed with 40 test participants (20 light and 20 heavy participants) using 21 real road signals obtained from the road tests. From the results the hypothesis was established that different amplitude groups may require different frequency weightings. Three amplitude groups were defined and the frequency weightings were selected for each amplitude group. The following findings can be drawn from the research: • the equal sensation curves suggest a nonlinear dependency on both the frequency and the amplitude. • the subjective responses obtained from band-limited random stimuli were steeper and the deeper in the shape of the equal sensation curves than those obtained using sinusoidal vibration stimuli. • females provided higher perceived intensity values than the males for the same physical stimulus at most frequencies. • light test participants provided higher perceived intensity than the heavy test participants for the same physical stimulus at most frequencies. • the equal sensation curves for steering wheel rotational vibration differ mainly due to differences in body size, rather than differences of gender. • at least three frequency weightings may be necessary to estimate the subjective intensity for road surface stimuli.
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Hockings, Nicholas. "Material and mechanical emulation of the human hand." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720651.
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The hands and feet account for half of the complexity of the musculoskeletal system, while the skin of the hand is specialised with many important structures. Much of the subtlety of the mechanism of the hand lies in the soft tissues, and the tactile and proprioceptive sensitivity depends on the large number of mechanoreceptors embedded in specific structures of the soft tissues. This thesis investigates synthetic materials and manufacturing techniques to enable building robots that reproduce the biomechanics and tactile sensitivity of vertebrates – histomimetic robotics. The material and mechanical anatomy of the hand is reviewed, highlighting difficulty of numerical measurement in soft-tissue anatomy, and the predictive nature of descriptive anatomical knowledge. The biomechanical mechanisms of the hand and their support of sensorimotor control are presented. A palate of materials and layup techniques are identified for emulating ligaments, joint surfaces, tendon networks, sheaths, soft matrices, and dermal structures. A method for thermoplastically drawing fine elastic fibres, with liquid metal amalgam cores, for connecting embedded sensors is demonstrated. The performance requirements of skeletal muscles are identified. Two classes of muscle-like bulk MEMS electrostatic actuators are shown theoretically to be capable of meeting these requirements. Means to manufacture them, and their additional application as mechanoreceptors are described. A novel machine perception algorithm is outlined as a solution to the problem of measuring soft tissue anatomy, CAD/CAE/CNC for layup of histomimetic robots, and sensory perception by such robots. The results of the work support the view that histomimetic robotics is a viable approach, and identify a number of areas for further investigation including: polymer modification by graft-polymerisation, automated layup tools, and machine perception.
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Ross, Alasdair Iain. "The effects of perceptual, motor and cognitive constraints on obstacle avoidance during reaching." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=230168.
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Performing goal-directed hand-movements in the presence of obstacles is a task that we usually complete successfully many times a day without much conscious consideration. Yet, little is known about the underlying processes. The aim of this thesis was to investigate the role of perceptual, motor and cognitive constraints on obstacle avoidance during reaching. To do this a tabletop-based obstacle avoidance setup and motiontracking were used. In the first experimental chapter, the previously reported tendency of participants to select movement paths that pass roughly through the mid-point between two obstacles was examined. The starting position of the hand and the availability of visual feedback were manipulated and evidence was found that movement path selection depends on both a collision-avoidance strategy and the associated biomechanical costs; even when visual feedback is unavailable. The second experimental chapter investigated an action-blindsight phenomenon, specifically the ability of cortically blind patients to avoid unseen obstacles. It was found that only two out of the six patients tested potentially showed some residual sensitivity to obstacles in their blind visual field. The final two experimental chapters went further to examine the role of perceptual information and attentional mechanisms respectively. It was found that during obstacle avoidance participants predominantly look at the movement target and rarely towards any obstacles or their moving hand. Furthermore, they tend to move their hand away from obstacles that are fixated. Finally, it was also found that a concurrent attentional task affected movement path selection in a similar way. At present it is unclear whether these perceptual and attentional effects are additive or independent of each other. Overall, these findings suggest that both conscious visual information and attentional mechanisms are crucial factors in determining movement path selection during obstacle avoidance in reaching.
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Thaler, Lore. "A Representation Based Approach To Visually Guided Motor Behavior." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211929634.
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Filimon, Flavia. "Multisensory and sensorimotor representations for action in human posterior parietal cortex investigated with functional MRI." Diss., [La Jolla] : University of California, San Diego, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3320178.
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Thesis (Ph. D.)--University of California, San Diego, 2008.Title from first page of PDF file (viewed September 24, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 133-135).
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Lambert, Séverine. "Modèle du mind's hand : contribution anatomo-fonctionnelle et comportementale à l'étude du lien entre l'image mentale et la perception dans le handicap visuel." Lyon 1, 2003. http://www.theses.fr/2003LYO1T174.
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La 4e de couverture indique : "Dans les recherches consacrées au lien unissant l'image mentale et la perception, nous avons centré notre travail sur la cécité. A quel degré de similitude (structurale, fonctionnelle et anatomique) l'objet imagé correspond à l'objet réel chez des aveugles ? Deux études par IRMf ont identifié les mécanismes cérébraux mis en jeu dans la génération mentale. Quatre études comportementales ont spécifié la nature du format de l'image en fonction du résidu visuel, de l'âge chronologique et de la proximité de l'expérience perceptive. Les résultats ont montré que (a) les images des aveugles sont différentes des voyants parce qu'elles sont issues de perceptions différentes et (b) les mécanismes empruntés pour former une image mentale sont similaires entre les deux groupes. Notre modèle approfondit les notions d'image mentale, de trace perceptive en distinguant le buffer tactile et l'indexation des informations. "
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Master, Sabah. "Motor Control and Perception during Haptic Sensing: Effects of Varying Attentional Demand, Stimuli and Age." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23548.
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This thesis describes a series of experiments in human observers using neurophysiological and behavioural approaches to investigate the effects of varying haptic stimuli, attentional demand and age on motor control and perception during haptic sensing (i.e., using the hand to seek sensory information by touch). In Experiments I-IV, transcranial magnetic stimulation (TMS) was used to explore changes in corticomotor excitability when participants were actively engaged in haptic sensing tasks. These studies showed that corticospinal excitability, as reflected in motor evoked potential (MEP) amplitude, was greatly enhanced when participants were engaged in different forms of haptic sensing. Interestingly, this extra corticomotor facilitation was absent when participants performed finger movements without haptic sensing or when attention was diverted away from haptic input by a concurrent cognitive task (Exp I). This provided strong evidence that the observed corticomotor facilitation was likely central in origin and related to haptic attention. Neuroimaging has shown activation of the parieto-frontal network likely subserves this aspect of haptic perception. Further, this haptic-specific corticomotor facilitation was finely modulated depending on whether participants focused attention on identifying material (texture) as opposed to geometric properties of scanned surfaces (Exp II). With regards to aging effects, haptic-related corticomotor facilitation was associated with higher recognition accuracy in seniors (Exp III). In line with this, seniors exhibited similar levels of haptic-related corticomotor facilitation to young adults when task demands were adjusted for age (Exp IV). Interestingly, both young and senior adults also showed substantial corticomotor facilitation in the ‘resting’ hand when the ipsilateral hand was engaged in haptic sensing (Exp IV). Simply touching the stimulus without being required to identify its properties (no attentional task demands) produced no extra corticomotor facilitation in either hand or age group, attesting again to the specificity of the effects with regards to haptic attention. In Experiments V-VI, the ability to recognise 2-D letters by touch was investigated using kinematic and psychophysical measures. In Experiment V, we characterized how age affected contact forces deployed at the fingertip. This investigation showed that older adults exhibited lower normal force and increased letter-to-letter variability in normal force when compared to young adults. This difference in contact force likely contributed to longer contact times and lower recognition accuracy in older adults, suggesting a central contribution to age-related declines in haptic perception. Consistent with this interpretation, Experiment VI showed that haptic letter recognition in older adults was characterized not only by lower recognition accuracy but also by substantial increases in response times and specific patterns of confusion between letters. All in all, these investigations highlight the critical interaction of central factors such as attentional demand with aging effects on motor and perceptual aspects of haptic sensing. Of particular significance is the clear demonstration that corticomotor excitability is greatly enhanced when a haptic sensing component (i.e., attending to specific haptic features) is added to simple finger movements performed at minimal voluntary effort levels (typically <15 % of the maximal effort). These observations underline the therapeutic potential of active sensory training strategies based on haptic sensing tasks for the re-education of motor and perceptual deficits in hand function (e.g., subsequent to a stroke). The importance of adjusting attentional demands and stimuli is highlighted, particularly with regards to special considerations in the aging population.
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Lu, Yang. "Tour Into Painting : System Design for Virtual Exhibition of Chinese Hand-Scroll Painting." Thesis, Ecole centrale de Nantes, 2022. https://tel.archives-ouvertes.fr/tel-03921024.
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La peinture chinoise à rouleau (CHSP) est une forme de peinture chinoise typique. La manière correcte de regarder une CHSP est de la faire défiler à la main. Regarder une CHSP est considéré comme une expérience fantastique de visite dans son monde diégétique. Dans les expositions actuelles de CHSP, ces points ne sont pas bien représentées. Premièrement, la plupart des CHSP sont présentés dans des boîtes en verre. Les spectateurs ne peuvent pas les manipuler en les faisant défiler. Deuxièmement, l'expérience de la visite d'une peinture n'est interprétée que par de simples annotations. Les spectateurs ne peuvent pas acquérir une expérience complète à partir de ces annotations. Cette recherche a exploré l'utilisation de la réalité virtuelle (RV) pour combler ces lacunes. L'objectif de cette recherche est de développer un système d'exposition basé sur la RV, qui peut simuler de manière synchrone l'expérience de visualisation de l'ancien spectateur dans le monde réel et l'expérience de visite dans le monde diégétique. Le système est présenté comme une application de RV qui comprend une CHSP interactive qui peut être manipulé selon les principes originaux. De manière synchrone, l'utilisateur de la RV sera déplacé en fonction de son point de focalisation sur la CHSP virtuelle, puis un monde diégétique englobant et aléatoire sera construitThe Chinese Hand-Scroll Painting (CHSP) is a typical Chinese painting form. The proper way to view a CHSP is scrolling it by hands. Watching a CHSP is considered as a fantasy experience of touring in its diegetic world. In current exhibitions of CHSPs, these points are not well represented. First, most of CHSPs are presented in glass boxes. Viewers can not manipulate it in scrolling manner. Second, the experience of touring into painting is only interpreted by simple annotations. Viewers can not gain a full experience based on them. This research aims to implementing these shortcoings by developing a VR-based exhibition system, which can synchronously simulate the ancient viewer's viewing experience in the real world and the touring experience in the diegetic world. The system is presented as a VR application that includes an interactive CHSP that can be manipulated according to the original principles. In a synchronous way, the VR user will be moved according to his focus point on the virtual CHSP, and then, an encompassing, random diegetic world will be built
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Löfmarck, Erik. "Den hand som föder dig : En studie av risk, mat och moderskap i Sverige och Polen." Doctoral thesis, Uppsala universitet, Sociologiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222698.
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This is a study of how mothers of young children relate to risk in everyday life, with an emphasis on the invisible risks associated with modernity in general, and with food in particular. It explores variations and similarities in how mothers deal with risk in two cultural contexts: Sweden and Poland. The study is based on twenty qualitative interviews with university educated mothers of small children in Stockholm and Warsaw. While risks more generally challenge how we “get on” with our lives, mothers of young children in particular have a special relationship to risk. During pregnancy and breastfeeding they are subject to all kinds of risk minimization efforts, and mothers are ultimately held "infinitely responsible" for their children's welfare by society. Women's transition to parenthood then makes for a particularly interesting case as to how risks manifest in everyday life. The theoretical framework draws on modernization theory, combined with insights from cultural theory. In addition, various contributions from sociological and psychological risk research, family sociology and research on parenting and motherhood are used to highlight contextual aspects and to interpret the empirical results. Two aspects of the mothers’ relationship to risk and food are examined in this study: firstly, their risk constructs, i.e. what they perceive as ‘risky’ with regards to food; and, secondly, their risk management strategies, i.e. how they deal with identified risks on a practical and cognitive level. The overall risk management depicted in this study is characterized by reflexivity, critical thinking, information retrieval, attention to scientific evidence, purposely transferred trust, confidence and the ability to make fairly sophisticated tradeoffs between risks and other aspects of life. Neither the Swedish nor the Polish mothers then conform to popular notions of ‘security junkies’ or ‘paranoid parenting’. Nonetheless, the comparative approach demonstrates how contextual differences, such as general trust levels and family policy, influence both the risk constructs and the employment of different risk management strategies.
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Nunes, Andreia. "Perceção e conhecimentos dos enfermeiros sobre as boas práticas de higienização das mãos." Bachelor's thesis, [s.n.], 2018. http://hdl.handle.net/10284/7628.
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Projeto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em EnfermagemA higienização das mãos é reconhecida mundialmente como uma medida primária e muito importante, no controle de infeções relacionadas com os cuidados de saúde. Por esse motivo, tem sido considerada como um dos pilares da prevenção e do controlo de infeções nos serviços de saúde, incluindo aquelas decorrentes da transmissão cruzada de microrganismos multirresistentes (Anvisa, 2009). A elaboração desta investigação pretende dar resposta ao objetivo geral do estudo: “Avaliar a Perceção e o Conhecimento dos Enfermeiros sobre as Higienização das Mãos” Na abordagem da problemática, recorreu-se a realização de um estudo descritivo, transversal e, inserido no paradigma quantitativo. Como instrumento de colheita de dados utilizou-se um questionário da Direção Geral de Saúde, distribuído por uma amostra de 27 enfermeiros do Hospital do Norte do país e de aplicação direta. Para tratamento estatístico, recorreu-se ao programa informático Microsoft Excel. Os resultados do estudo vão ao encontro dos resultados de diversos estudos feitos anteriormente que demonstraram que os profissionais evidenciam conhecimentos e atribuem bastante importância à higienização das mãos, existindo, contudo alguns fatores que dificultam a correta realização da prática, tais como a falta de tempo para cada doente e falta de formação e desconhecimento da prática adequada cada momento.
Hand sanitization is widely known as a primary and very important measure on the control of infections related with health care. For that reason, is has been considered as one of the pillars for infection prevention and control in health care services, including infections caused by cross transmission of multi-resistant microorganisms. (Anvisa, 2009). The elaboration of this investigation intends to answer the general study goal: “Evaluate the perception and knowledge of nurses on hand sanitization”. While approaching the problem, a descriptive and transversal study was carried out and added in a quantitate paradigm. As a data sampling instrument, the Direção Geral de Saúde survey was used and delivered to a sample of 27 nurses of the Hospital do Norte and direct application. Microsoft Excel was used for statistics treatment. The study results meet the results of other studies previously done which demonstrate that health professionals show knowledge and attribute plenty of importance to hand sanitization. There are, however, some factors which hinder the correct practice execution like lack of time for each patient and lack of formation or knowledge of each adequate practice.
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Clapés, i. Sintes Albert. "Learning to recognize human actions: from hand-crafted to deep-learning based visual representations." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/666794.
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Action recognition is a very challenging and important problem in computer vision. Researchers working on this field aspire to provide computers with the ability to visually perceive human actions – that is, to observe, interpret, and understand human-related events that occur in the physical environment merely from visual data. The applications of this technology are numerous: human-machine interaction, e-health, monitoring/surveillance, and content-based video retrieval, among others. Hand-crafted methods dominated the field until the apparition of the first successful deep learning-based action recognition works. Although earlier deep-based methods underperformed with respect to hand-crafted approaches, these slowly but steadily improved to become state-of-the-art, eventually achieving better results than hand-crafted ones. Still, hand-crafted approaches can be advantageous in certain scenarios, specially when not enough data is available to train very large deep models or simply to be combined with deep-based methods to further boost the performance. Hence, showing how hand-crafted features can provide extra knowledge the deep networks are not able to easily learn about human actions.
This Thesis concurs in time with this change of paradigm and, hence, reflects it into two distinguished parts. In the first part, we focus on improving current successful hand-crafted approaches for action recognition and we do so from three different perspectives. Using the dense trajectories framework as a backbone: first, we explore the use of multi-modal and multi-view input data to enrich the trajectory descriptors. Second, we focus on the classification part of action recognition pipelines and propose an ensemble learning approach, where each classifier learns from a different set of local spatiotemporal features to then combine their outputs following an strategy based on the Dempster-Shaffer Theory. And third, we propose a novel hand-crafted feature extraction method that constructs a mid-level feature description to better model long-term spatiotemporal dynamics within action videos.
Moving to the second part of the Thesis, we start with a comprehensive study of the current deep-learning based action recognition methods. We review both fundamental and cutting edge methodologies reported during the last few years and introduce a taxonomy of deep-learning methods dedicated to action recognition. In particular, we analyze and discuss how these handle the temporal dimension of data. Last but not least, we propose a residual recurrent network for action recognition that naturally integrates all our previous findings in a powerful and promising framework.El reconeixement d’accions és un repte de gran rellevància pel que fa a la visió per computador. Els investigadors que treballen en el camp aspiren a proveir als ordinadors l’habilitat de percebre visualment les accions humanes – és a dir, d’observar, interpretar i comprendre a partir de dades visuals els events que involucren humans i que transcorren en l’entorn físic. Les aplicacions d’aquesta tecnologia són nombroses: interacció home-màquina, e-salut, monitoració/vigilància, indexació de videocontingut, etc. Els mètodes de disseny manual han dominat el camp fins l’aparició dels primers treballs exitosos d’aprenentatge profund, els quals han acabat esdevenint estat de l’art. No obstant, els mètodes de disseny manual resulten útils en certs escenaris, com ara quan no es tenen prou dades per a l’entrenament dels mètodes profunds, així com també aportant coneixement addicional que aquests últims no són capaços d’aprendre fàcilment. És per això que sovint els trobem ambdós combinats, aconseguint una millora general del reconeixement. Aquesta Tesi ha concorregut en el temps amb aquest canvi de paradigma i, per tant, ho reflecteix en dues parts ben distingides. En la primera part, estudiem les possibles millores sobre els mètodes existents de característiques manualment dissenyades per al reconeixement d’accions, i ho fem des de diversos punts de vista. Fent ús de les trajectòries denses com a fonament del nostre treball: primer, explorem l’ús de dades d’entrada de múltiples modalitats i des de múltiples vistes per enriquir els descriptors de les trajectòries. Segon, ens centrem en la part de la classificació del reconeixement d’accions, proposant un assemblat de classificadors d’accions que actuen sobre diversos conjunts de característiques i fusionant-ne les sortides amb una estratégia basada en la Teoria de Dempster-Shaffer. I tercer, proposem un nou mètode de disseny manual d’extracció de característiques que construeix una descripció intermèdia dels videos per tal d’aconseguir un millor modelat de les dinàmiques espai-temporals de llarg termini presents en els vídeos d’accions. Pel que fa a la segona part de la Tesi, comencem amb un estudi exhaustiu els mètodes actuals d’aprenentatge profund pel reconeixement d’accions. En revisem les metodologies més fonamentals i les més avançades darrerament aparegudes i establim una taxonomia que en resumeix els aspectes més importants. Més concretament, analitzem com cadascun dels mètodes tracta la dimensió temporal de les dades de vídeo. Per últim però no menys important, proposem una nova xarxa de neurones recurrent amb connexions residuals que integra de manera implícita les nostres contribucions prèvies en un nou marc d’acoblament potent i que mostra resultats prometedors.
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Leliveld, Lisette Maria Charlotte [Verfasser]. "Asymmetries in hand usage and perception of communication sounds in early primates (Microcebus spp.) : effects of sex and experience / Lisette Maria Charlotte Leliveld." Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2012. http://d-nb.info/1018553754/34.
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Lamont-Robinson, Catherine Ann. "Hand to clay : art practice and the visually impaired : the impact of tactual perception and narrative thinking upon cognitive development and identity construction." Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411633.
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Silva, Silmara Nicolau Pedro da. "Evolução fisiológica da sensibilidade e da força da mão com o envelhecimento." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-26032013-142324/.
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Introdução: Os estudos, a respeito das condições de sensibilidade e força ao longo da vida, ainda são escassos, principalmente os que abordam vários aspectos da sensibilidade como sensibilidade à pressão, vibratória, dolorosa e da força de pinça e preensão. Algumas pesquisas apontam para a redução da força muscular com o avanço da idade, mas desconhecem o seu comportamento, magnitude e os hábitos de vida que podem influenciar nessa evolução. Objetivo: Analisar, através de testes específicos, a evolução da sensibilidade e da força manual em grupo de voluntários saudáveis nas diferentes idades acima de 20 anos e investigar a influência de alguns hábitos de vida. Casuística e Métodos: A força e a sensibilidade das mãos foram avaliadas em um estudo seccional em 116 voluntários humanos. Realizamos testes específicos de sensibilidade e de força em um grupo de voluntários saudáveis acima de 20 anos, compreendida entre 21 e 96 anos de idade. A pesquisa foi desenvolvida entre 2006 e 2010 e avaliou 70 mulheres e 46 homens. Foram aplicados testes de avaliação bimanual das forças de pinça e preensão (dinamômetros B&L Pinch-Gauge® e Jamar®), sensibilidades ao toque (Monofilamentos de Semmes-Weinstein), à discriminação de dois pontos (Mackinnon-Dellon disk-criminator®) estática e móvel, à vibração (diapasão) e o limiar mínimo percebido e máximo tolerado frente ao estímulo elétrico. Para a análise estatística foram realizadas as correlações das diversas variáveis através dos testes de Correlação de Pearson, de Spearman, Regressão Multivariada além da elaboração de equações multifatoriais e linha de regressão. Resultados: Os valores da pinça polpa a polpa e três pontos diminuíram com o avanço da idade, foram maiores no gênero masculino, e sofreram influência positiva em quem pratica atividade física e nos que tocam instrumento musical; sendo o gênero o fator mais determinante. Os valores da pinça lateral e preensão Jamar® obtiveram resultados semelhantes, porém a idade foi o fator que mais influenciou nos resultados. A sensibilidade discriminativa móvel e estática piora com a idade, é melhor nos homens e sofre influência em quem toca instrumento musical. A idade é o fator mais importante para determinar a sensibilidade à pressão e à discriminação estática e móvel entre dois pontos. No teste de Tolerância ao Estimulo Elétrico, observamos que quanto maior a idade, maior a intensidade que a pessoa precisa para começar a sentir o estímulo. A tolerância máxima ao estímulo elétrico somente foi correlacionada positivamente ao gênero, sendo mais tolerada nos homens. Não foi encontrada alteração à sensibilidade vibratória quando avaliada com o diapasão. É possível estimar com equações de regressão, os valores de força e sensibilidade ao longo do envelhecimento da mão e assim, diferenciar as alterações causadas por patologias ou pelo processo natural de envelhecimento ao longo da vida. Conclusões: A sensibilidade e a força da mão pioram com a idade. É possível estimar a evolução fisiológica da sensibilidade e força das mãos em homens e mulheres no decorrer do envelhecimento. Alguns hábitos podem influenciar a evolução da sensibilidade e da força, como a prática de instrumentos musicais e atividade físicaIntroduction: The studies concerning the conditions of sensitivity and strength throughout life are still scarce, mainly those which address several aspects of sensitivity such as sensitivity to pressure, vibratory sensitivity, pain sensitivity, and pinch and grasp strength sensitivity. Some research studies indicate that muscular strength is reduced as age advances, but they lack information about its behavior, magnitude and life habits that can influence this evolution. Objective: To analyze, through specific tests, the evolution of sensitivity and hand strength in a group of healthy volunteers in different ages above 20 years and investigate the influence of some life habits. Case studies and Methods: Hand strength and sensitivity were evaluated in a cross-sectional study in 116 human volunteers. We performed specific tests of sensitivity and strength in a group of healthy volunteers aged between 21 and 96 years. Research was developed between 2006 and 2010, having assessed 70 females and 46 males. The following tests were applied, namely test of bimanual evaluation of pinch and grasp strength (B&L Pinch-Gauge® and Jamar® dynamometers), touch test (Semmes-Weinstein Monofilament), test of sensitivity to moving and static two-point discrimination(Mackinnon-Dellon diskcriminator ®), vibration (tuning fork) and minimal and maximal thresholds of tolerance to electric stimulus. For the statistical analysis the correlations of several variables were performed through Pearson Correlation Test, Spearman, Multivariate Regression, besides multifactorial equations and regression line. Results: The values of tip pinch and three points decreased with advancing age, were greater in the male gender, and suffered positive influence in those who do physical activities and those who play musical instruments, gender being the most determining factor. The values of lateral pinch and Jamar grip achieved similar results, but age was the factor that mostly influenced the results. Moving and static discriminatory sensitivity is impaired with age, is better in males and reflects the influence of playing a musical instrument. Age is the most important factor to determine sensitivity to pressure and moving and static discrimination between two points. In the Tolerance to Electric Stimulus Test we observed that the greater the age, the greater the intensity needed for a person to start feeling the stimulus. Maximal tolerance to electric stimulus was positively correlated only with gender, being better tolerated in males. No alteration was found in the vibratory sensitivity evaluated by means of the tuning fork. It is possible to calculate by regression equations the values of strength and sensitivity throughout hand aging and so distinguish the alterations caused by pathologies or by the natural process of aging during lifetime. Conclusions: Sensitivity and hand strength grow worse with age. It is possible to estimate the physiologic evolution of sensitivity and hand strength in males and females with aging. Some habits can influence the evolution of sensitivity and strength, such as playing musical instruments and physical exercise
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Abrahamyan, Arman. "Attentional capture of emotional static and dynamic hand gestures and faces : the effect of valence in a novel stroop-based paradigm." Thesis, View thesis, 2008. http://handle.uws.edu.au:8081/1959.7/45703.
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Task-irrelevant static emotional faces, pictures, and words are known to involuntarily receive or capture attention. Hand gestures, similar to faces, are biological stimuli that are often used to express emotion. This thesis examines attentional capture using static emotional hand gestures and dynamic emotional hand gestures and faces. The component processes model of emotion predicts that either positive or negative stimuli that are appraised as relevant will capture attention for further and deeper processing. Attentional capture and the resulting competition for resources to process emotional stimuli can cause interference with an ongoing implicit cognitive task. In a series of experiments, participants identified the gender of hand or face stimuli while neutral, positive, and negative valence of stimuli was manipulated. It was hypothesised that interference resulting from attentional capture would lead to greater gender identification accuracy for static neutral hand gestures than for static positive or negative hand gestures. Neutral and emotional static faces were used as comparison stimuli. The hypothesis was tested in six experiments using a novel Stroop-based experimental paradigm, specifically devised for future implementation in Magnetoencephalography (MEG) environment. Stimulus items were presented to the peripheral visual field in one of four quadrants for 100 ms (Experiments 1 and 4), 200 ms (Experiment 2), and 300 ms (Experiment 3) each, in trials of eight items with an inter-stimulus interval (ISI) that varied from 1800 to 2300 ms. As hypothesised, accuracy of identifying neutral hand gestures was significantly greater than accuracy of identifying gender of positive or negative hand gestures. The hypothesis was also supported for the case of negative faces but not for positive faces. The lack of an effect in response to positive faces is possibly due to the valence ambiguity of neutral faces capturing attention and interfering with gender identification. Experiment 5 examined attentional capture using emotional static hand gestures and faces presented to the central visual field. Only positive hand gestures and positive faces captured attention in this experiment. Experiment 6 tested two hypotheses using dynamic stimuli presented in the peripheral visual field for 300 ms. The hypothesis that greater gender identification accuracy would be found for neutral hand gestures/faces than for positive or negative hand gestures/faces was supported for positive hand gestures and negative faces, but not for negative hand gestures and positive faces. A second hypothesis was that greater attentional capture and resulting interference from dynamic stimuli would lead to poorer gender identification accuracy for emotional dynamic stimuli than for emotional static stimuli. The results of Experiment 6 did not support this hypothesis. These six experiments demonstrate that both static and dynamic positive and negative hand gestures and dynamic negative faces capture attention and interfere with an ongoing cognitive task when presented to the peripheral visual field. The experiments also demonstrate that static positive hand gestures and static positive faces capture attention when presented to the central visual field. Moreover, the novel Stroop-based experimental design appears to be a useful method for studying attentional capture using emotional pictorial stimuli and has already been implemented in a companion MEG experiment. A model explaining attentional capture and interference using emotional stimuli is proposed, based on the component processes model of emotion. In the model, the degree of attention recruited during the primary appraisal is proportional to the degree of interference with an implicit cognitive task.
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Abrahamyan, Arman. "Attentional capture of emotional static and dynamic hand gestures and faces the effect of valence in a novel stroop-based paradigm /." View thesis, 2008. http://handle.uws.edu.au:8081/1959.7/45703.
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Thesis (Ph.D.)--University of Western Sydney, 2008.A thesis presented to the University of Western Sydney, College of Arts, MARCS Auditory Laboratories, in fulfilment of the requirements for the degree of Doctor of Philosophy. Includes bibliographies.
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Nascimento, Leonardo Penteado. "Desenvolvimento do teste de sensibilidade tátil da mão." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/5/5170/tde-29102014-144147/.
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Contextualização: Os testes de sensibilidade tátil da mão existentes não permitem considerar diferentes receptores, detectar variações na faixa de normalidade ou caracterizar o processo de desenvolvimento e envelhecimento. Objetivo: Elaborar um conjunto de atividades-testes para avaliar sensibilidade tátil da mão que forneça escore e tempo de execução das tarefas, com rotina de aplicação e coleta de dados detalhada em manual. Método: Para elaboração do teste foi realizada revisão da literatura e reuniões de grupo para criação de atividades-testes, seleção de materiais e elaboração do manual. Teste e manual foram submetidos à avaliação de 30 pareceristas, em 3 fases, cada uma com 10 examinadores. Resultado: O Teste de sensibilidade tátil da mão, denominado THPH (do inglês, test of haptic perception of hand) desenvolvido tem por objetivo graduar a sensibilidade tátil manual, considerando diferentes domínios sensoriais: depressão, elevação, textura, densidade, barognosia e reconhecimento de formas planas, tridimensionais de pequena e grande elevação. Cada atividade-teste possui um material específico. O escore pode variar de 0 a 57, sendo 0 a pior nota. Na primeira etapa foram sugeridas 12 modificações e aceitas 9 delas. As estruturas de teste de depressão, elevação, barognosia e reconhecimento de formas foram consideradas adequadas. Na segunda etapa foram sugeridas 3 modificações e aceita uma. As estruturas do teste de depressão foram modificadas novamente. Na terceira etapa foram dadas sugestões de continuidade do estudo. Conclusão: O processo metodológico escolhido permitiu a elaboração de um manual descritivo de atividades-testes específicas para avaliar seis diferentes domínios da sensibilidade tátil a partir da organização de grupo de trabalho e direcionamento fornecido por 30 pareceristasBackground: The tests of tactile sensitivity of hand do not allow considering different receptors, to detect variations in the range of normality or characterize the process of development and aging. Objective: To develop a set of activities-tests to assess tactile sensitivity of the hand to provide score and runtime, routine of application and collection of data. Method: It was performed a literature review, group meetings for test creation and materials testing and preparation of the manual. Test and its manual were submitted to 30 reviewers in 3 stages, each one with 10 examiners. Result: The Test of Haptic Perception of Hand (THPH) developed aims to graduate tactile sensitivity of hand according to the different sensory domains: depression, elevation, texture, density, weight perception and shape recognition, each one with the respective material. The score may range from 0 to 57, with 0 being the worst rating. In the first stage with participation of 10 examiners it was suggested 12 changes, of which 9 were accepted. The structures of the test domain depression, elevation, and shape recognition barognosis were considered adequate. In the second stage the structures of the depression were changed again. In the third step suggestions were given to continuity of the study. Conclusion: The chosen methodological process allowed the preparation of a manual illustrative and specific material to evaluate six different domains of tactile manual with the group organization and direction provided by 30 examiners in three phases
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Hubbard, Amy L. "Giving speech a hand fMRI of co-speech beat gesture processing in adult native English speakers, Japanese English as a second language speakers, typically-developing children, and children with autism spectrum disorder /." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1779835541&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Falcão, Franciane da Silva [UNESP]. "Dimensionamento sensorial tátil de ferramentas manuais: a relação entre percepção de usuários e texturas aplicadas em cabos de martelos de uso típico no DIMPE/AM." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/151564.
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Fundação de Amparo à Pesquisa do Estado do Amazonas (FAPEAM)
Pesquisas na área do design ergonômico têm delineado parâmetros para o desenvolvimento de diversos produtos, por meio do estudo da relação de aspectos formais de produtos e a percepção ou solicitações físicas humanas. Entretanto, estudos da correlação de aspectos formais da superfície de contato (texturas das interfaces) com a percepção humana no uso de ferramentas manuais apresentam-se ainda incipientes. Este estudo teve por objetivo avaliar a relação de três características formais de textura (disposição, densidade gráfica, profundidade) com a percepção de desconforto e agradabilidade, visando compreender o dimensionamento sensorial tátil em ferramentas manuais. Para tanto, foi aplicado a fase de avaliação do método SEQUAM, com uso de 8 mock-ups de martelos unha com distintas configurações de texturas aplicadas aos seus cabos. As simulações de uso foram realizadas com profissionais de marcenaria (PM) e usuários domésticos (UD). Os resultados desta abordagem experimental demonstraram que as características de disposição, densidade gráfica e profundidade interferem na percepção do usuário; e que entre estas três características a densidade gráfica das ranhuras apresentou um número maior de aspectos perceptíveis com diferenças significativas (p<0,05) entre os mock-ups. Outro dado expressivo foi a diferença de percepção entre os grupos de sujeitos PM e UD. Estes resultados caracterizam as texturas das superfícies de contato de ferramentas manuais como elementos formais associados a certas percepções obtidas no uso do produto; e aponta possíveis contribuições de estudos sobre dimensionamento sensorial tátil para o design ergonômico de ferramentas manuais.
Researches in the area of ergonomic design have outlined parameters for the development of several products, through the study of the relationship of formal aspects of products and the perception or human physical requests. However, studies of the correlation of formal aspects of the contact surface (interfaces textures) with human perception in the use of hand tools are still incipient. The aim of this study was to evaluate the relationship of three formal characteristics of texture (layout, graphic density, depth) with the perception of discomfort and pleasantness, in order to understand the tactile sensorial dimensioning in hand tools. Therefore, the evaluation phase of the method SEQUAM, with use of 8 mock-ups of nail hammers with distinct texture configurations applied to their cables. The use simulations were performed with carpentry professionals and home users. The results of this experimental approach demonstrated that the characteristics of layout, graphic density and depth interfere in the perception of the user; and that among these three characteristics the graphical density of the grooves presented a greater number of perceptible aspects with significant differences (p <0.05) between the mock-ups. Another expressive data was the difference of perception between the groups of subjects, carpentry professionals and home users. These results characterize the textures of contact surfaces of hand tools as formal elements associated with certain perceptions obtained in the use of the product; and points out possible contributions of studies on tactile sensorial dimensioning for the ergonomic design of hand tools.
FAPEAM: 2800/2011
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Hemström, Mirjam. "The Metamorphosis of Weaving." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-25173.
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There is a link between the tactile and optical modes of perception. Woven textiles’ materiality and ability to take three dimensional form, make them a good medium for creating shapes containing several pattern scales and textures. By conciously working with tactile-visual qualities and aesthetics one can achieve the most powerful effects, and in turn, the textile can take the role of a sensation director. By interpreting Kasuri with large scaled threads on a computerized hand loom and in space, an exploration of details and spatial installation can be conducted simultaneously. The five examples developed in this project demonstrate different approaches to dimensional hand weaving, intending to build a better understanding of micro and macro spatial features in woven textiles. Significantly, the project challenges the scale of hand weaving as well as the design process: stretching from thread to dimensional weave empowers the designer. By highlighting crafted details on a large scale, a sequence of events can be discerned that makes the spectator aware of quality and of the production process. Parallels between the body of work and our perception of lines and interspaces are drawn as an attempt to refine our relation to the objects around us.
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GIURGOLA, SERENA. "PLASTIC MODULATIONS OF THE BODY METRIC REPRESENTATION: NEUROPHYSIOLOGICAL AND BEHAVIORAL EVIDENCE." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/261947.
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La conoscenza della grandezza delle proprie parti corporee è essenziale per muoversi in maniera efficiente nell’ambiente esterno e per interagire accuratamente sia con gli oggetti sia con le altre persone. Attraverso un approccio interdisciplinare che combina paradigmi neurofisiologici (stimolazione cerebrale non invasiva) e comportamentali, la presente tesi indaga i meccanismi cognitivi e neurali sottostanti la rappresentazione della grandezza delle parti corporee. Lo Studio #1 dimostra il ruolo causale della corteccia somatosensoriale primaria nell’elaborazione della grandezza delle proprie parti del corpo. Nei soggetti adulti neurologicamente sani, la Stimolazione Magnetica Transcranica ripetitiva a 1-Hz della rappresentazione della mano nella mappa somatosensoriale di entrambi gli emisferi, induce delle distorsioni percettive (sovrastima) della grandezza della propria mano – come valutato con un compito visuo-percettivo – che non si estendono ad altri distretti corporei (il piede). Invece, cambiamenti nell’eccitabilità corticale indotti da Stimolazione Magnetica Transcranica ripetitiva del lobulo parietale inferiore destro o sinistro non influenzano la stima percettiva della grandezza della propria mano. Tale evidenza sottolinea il coinvolgimento causale della corteccia somatosensoriale primaria nella costruzione e nell’aggiornamento della rappresentazione metrica del proprio corpo. Lo Studio #2 si focalizza sui cambiamenti plastici che avvengono manipolando il senso di appartenenza corporea mostrando che, negli adulti neurologicamente sani, l’embodiment di mani più grandi (ma non più piccole) della propria influenza la rappresentazione percettiva cosciente della dimensione della propria mano. Infine, comparando la rappresentazione metrica del corpo in bambini a sviluppo tipico con quella degli adulti neurologicamente sani, lo Studio #3 mostra come le distorsioni percettive della rappresentazione corporea emergono durante il corso dello sviluppo. Complessivamente, i risultati della presente tesi supportano la natura estremamente flessibile della rappresentazione metrica del proprio corpo, mostrando come le distorsioni plastiche della grandezza delle proprie parti corporee si sviluppano gradualmente nell’arco della vita e possono essere modulate sia da cambiamenti neurofisiologici, sia da manipolazioni illusorie del senso di embodiment.The knowledge of the size of the own body-parts is essential for efficiently moving in the external environment and accurately interacting both with objects and with other people. In an interdisciplinary approach which combines neurophysiological (i.e., non-invasive brain stimulation) and behavioral paradigms, the present dissertation investigates the cognitive and neural signatures underlying the representation of body-parts size. Study #1 demonstrates the casual role of the primary somatosensory cortex in one’s own body-parts size processing. In healthy adults, 1-Hz repetitive Transcranial Magnetic Stimulation over the hand representation in the somatosensory map of both hemispheres leads to perceptual distortions (i.e., overestimation) of the own hand size – as assessed with a visual perceptual task – which do not extend to other body districts (namely, the foot). Instead, cortical excitability shifts induced by repetitive Transcranial Magnetic Stimulation over the right or left inferior parietal lobule do not affect the perceptual estimation of the own hand size. This evidence highlights the causal involvement of the primary somatosensory cortex in the construction and updating of one’s own body metric representation. Study #2 focuses on the plastic changes which occur by manipulating the sense of body ownership, showing that, in healthy adults, the embodiment of external hands bigger (but not smaller) than the own affects the perceptual conscious representation of the own hand dimension. Finally, by comparing body metric representation in typically developing children and healthy adults, Study #3 shows how perceptual distortions of body-parts representation arise during the developmental course. Overall, findings from this dissertation support the extremely flexible nature of one’s own body metric representation, showing how plastic distortions of the own body-parts size develop gradually during the lifespan and can be modulated by neurophysiological changes as well as by illusory manipulations of self-attribution.
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Costa, João Carlos Viana Cunha. "Inteligência geral e conhecimento específico no Futebol : Estudo comparativo entre inteligência geral e o conhecimento específico em jovens federados de diferentes níveis competitivos." Master's thesis, Universidade do Porto. Reitoria, 2001. http://hdl.handle.net/10216/9930.
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Dissertação de Mestrado em Ciência do Desporto, área de especialização em Desporto para Crianças e Jovens, apresentada à Faculdade de Ciências do Desporto e de Educação Física da Universidade do PortoA investigação actual vem realçando a importância dos processos cognitivos nas acções realizadas no âmbito dos Jogos Desportivos Colectivos, em virtude das características complexas da sua intervenção. Entre os requisitos considerados fundamentais, o conhecimento específico da modalidade parece possuir um peso importante na performance desportiva. Contudo, a existência dum elevado nível de conhecimento poderá não garantir uma elevada prestação, se os caminhos de circulação de informação não estiverem optimizados e se o jogador não for capaz de adaptar e reordenar a sua intervenção em cada momento de jogo.No âmbito da avaliação do conhecimento específico em Jogos Desportivos Colectivos, os protocolos têm privilegiado, simultaneamente, a análise da prontidão e da qualidade da resposta, através de inquéritos de resposta múltipla.No presente estudo pretende-se analisar e comparar a forma como a inteligência geral dos jogadores de Futebol e o seu conhecimento específico do jogo se relacionam. Mais especificamente, pretende-se: avaliar e comparar a Inteligência geral e o conhecimento específico do jogo em jovens praticantes de Futebol segundo os respectivos estatutos posicionais e nível competitivo; e contrastar a percepção do treinador, face à capacidade de decisão e ao conhecimento específico do jogo dos seus jogadores, com os resultados obtidos pelos seus jogadores nos testes de inteligência geral e do conhecimento específico do jogo.Para tal, foram utilizados o teste de atenção de Toulouse-Piéron, o teste das figuras Idênticas de Thurstone e as Matrizes Progressivas de Raven, para avaliar os processos cognitivos gerais dos jovens Futebolistas, bem como o protocolo de avaliação do conhecimento específico do jogo construído por Mangas (1999) e aperfeiçoado por Correia (2000). Estes instrumentos foram aplicados a uma amostra de 44 praticantes federados de futebol de diferentes níveis competitivos, com uma média de idades de 16.00±0.53 para o grupo de nível competitivo ...
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Costa, João Carlos Viana Cunha. "Inteligência geral e conhecimento específico no Futebol : Estudo comparativo entre inteligência geral e o conhecimento específico em jovens federados de diferentes níveis competitivos." Dissertação, Universidade do Porto. Reitoria, 2001. http://hdl.handle.net/10216/9930.
Full textAbstract:
Dissertação de Mestrado em Ciência do Desporto, área de especialização em Desporto para Crianças e Jovens, apresentada à Faculdade de Ciências do Desporto e de Educação Física da Universidade do PortoA investigação actual vem realçando a importância dos processos cognitivos nas acções realizadas no âmbito dos Jogos Desportivos Colectivos, em virtude das características complexas da sua intervenção. Entre os requisitos considerados fundamentais, o conhecimento específico da modalidade parece possuir um peso importante na performance desportiva. Contudo, a existência dum elevado nível de conhecimento poderá não garantir uma elevada prestação, se os caminhos de circulação de informação não estiverem optimizados e se o jogador não for capaz de adaptar e reordenar a sua intervenção em cada momento de jogo.No âmbito da avaliação do conhecimento específico em Jogos Desportivos Colectivos, os protocolos têm privilegiado, simultaneamente, a análise da prontidão e da qualidade da resposta, através de inquéritos de resposta múltipla.No presente estudo pretende-se analisar e comparar a forma como a inteligência geral dos jogadores de Futebol e o seu conhecimento específico do jogo se relacionam. Mais especificamente, pretende-se: avaliar e comparar a Inteligência geral e o conhecimento específico do jogo em jovens praticantes de Futebol segundo os respectivos estatutos posicionais e nível competitivo; e contrastar a percepção do treinador, face à capacidade de decisão e ao conhecimento específico do jogo dos seus jogadores, com os resultados obtidos pelos seus jogadores nos testes de inteligência geral e do conhecimento específico do jogo.Para tal, foram utilizados o teste de atenção de Toulouse-Piéron, o teste das figuras Idênticas de Thurstone e as Matrizes Progressivas de Raven, para avaliar os processos cognitivos gerais dos jovens Futebolistas, bem como o protocolo de avaliação do conhecimento específico do jogo construído por Mangas (1999) e aperfeiçoado por Correia (2000). Estes instrumentos foram aplicados a uma amostra de 44 praticantes federados de futebol de diferentes níveis competitivos, com uma média de idades de 16.00±0.53 para o grupo de nível competitivo ...
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Vyas, Daivik B. "What a Handful! Electrophysiological Characterization of Sensory and Cognitive Biases on Spatial Attention and Visual Processing." Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/cmc_theses/1321.
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Attention uses sensory inputs and goals to select information from our environment. Monkey electrophysiological literature demonstrates that visuo-tactile bimodal neurons (respond to visual and tactile stimuli presented on/near the hand) facilitate multisensory integration. Human behavioral studies show that hand position/function bias visual attention. Event-related potentials (ERPs) reveal the cortical dynamics coordinating visual inputs, body position, and action goals. Early, sensory ERPs (N1) indicate multisensory integration. Later, cognitive ERPs (P3) reflect task-related processing. Study 1 investigates a discrepancy between monkey and human literatures. Monkey studies demonstrate bimodal neuron responses equidistantly around the whole hand, but human studies demonstrate attentional bias for grasping space. In a visual detection paradigm, participants positioned their hand so target and non-target stimuli appeared near the palm or back of the hand; ERPs were measured. N1 components indicated no amplitude differences between Palm vs. Back conditions, but P3 components revealed greater target vs. non-target differentiation for Palm conditions. Results suggest cortical timing underlies grasping vs. whole hand bias differences: early processing does not differentiate using hand function, but cognitive processing does when stimuli are discriminated for action. Study 2 investigates whether proprioceptive inputs facilitate visual processing. In a visual detection paradigm, participants viewed stimuli presented between occluders blocking view of a hand positioned either near or far from the stimuli. N1 amplitudes were similar for near and far conditions, but P3 amplitudes for target/non-target differences were accentuated for near conditions. Proprioceptive effects emerge later in processing. ERP reveals the cortical dynamics underlying hand position effects on vision.
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Hypes, Kathe. "Infection Control and Health Care Associated Infection (HCAI) in the Nursing Home: A Study to Determine the Impact of an Educational Video and Pamphlet About Infection Control on Knowledge and Perception of Hand Hygiene in Certified Nurse Assistants." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5317.
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The impact of an education program on perception, knowledge, and infection rate was evaluated in this study. The educational intervention consisted of a video on infection control and a World Health Organization (WHO) pamphlet for hand hygiene. The study was conducted in one nursing home in the Southeastern United States. The survey sample consisted of 66 certified nurse assistants (CNAs). A pre- and post-intervention design was employed using the WHO's Hand Hygiene Knowledge Questionnaire and the WHO Perception Survey. Friedman's test and central tendencies showed no statistical relationship between the educational intervention and the overall knowledge scores of the sample. There also were no statistical differences in perception of hand hygiene in the CNA sample. Infection frequency was reduced with a percent change of -42%. While results of knowledge and perception surveys were not statistically significant, multiple conclusions were derived to suggest that educational opportunities may impact hand hygiene practice in CNAs and lead to a decrease in infection.D.N.P.
Doctorate
Nursing
Nursing
Nursing Practice
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Lopes, Maria Inês Leiria Barroso Ferreira. "Características pedagógicas em treino desportivo-percepções da intervenção pedagógica do treinador em jogos desportivos colectivos (andebol, basquetebol e futebol)." Master's thesis, Instituições portuguesas -- UTL-Universidade Técnica de Lisboa -- -Faculdade de Motricidade Humana, 2003. http://dited.bn.pt:80/29608.
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Dimitrova, Valeria. "From Music to Medicine: Transfer of Motor Skills from Piano Performance to Laparoscopic Surgery." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42457.
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Background: Due to the deficit of knowledge on fine motor skill far transfer from one domain of expertise to another, piano performance and surgical training serve as a relevant, interdisciplinary context in which to study the transfer of motor skills given both have relatively well-established levels of performance and require complex fine motor skills. Musicians tend to demonstrate greater ease in all aspects of procedural knowledge which are known to contribute to the early stages of motor learning. Previous research in the Piano Pedagogy Research Laboratory (PPRL) found that extensive piano training was correlated with faster learning of surgical knot-tying skills. However, the short-term two-day timeline was a limitation of the study. Objective: Our project has built on previous work in the PPRL to address the short-term nature of previous studies by measuring a long-term performance curve as well as retention of surgical training and also expanded on the previous project by focussing this time on laparoscopic tasks. This study compared performance curves of two participant groups (pianists and controls) over five consecutive days and retention one week later, as measured by speed and accuracy of task completion. Laparoscopic training consisted of six tasks repeated at every session. Since laparoscopy involves a variety of abilities concurrently, we also administered a battery of ten psychometric tests to isolate and measure specific aspects of non-motor and fine motor skills. Results: There was no statistical difference between participant groups on the majority of laparoscopic training and psychomotor assessments based on two-way mixed ANOVA and Mann-Whitney U test analysis, respectively. There were also little to no significant correlations between abilities and laparoscopic performance. The only significant confounding variable was that the control group was significantly more interested in surgery than the musician group (p = .037). Conclusion: Overall, these results demonstrate that piano performance training did not far transfer to laparoscopic surgery. This is relevant to the debate on far transfer of motor skills given this study’s robust design which addressed previous shortcomings by including a longer timeline and more specifications of musicians’ characteristics. Our findings indicate that fine motor skills are domain specific to music and surgery, respectively.
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Berger, Brittany. "Hand Hygiene Perceptions of Student Nurses." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/honors/176.
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Compliance with hand hygiene is widely recognized as the most important factor in preventing transmission of infection to patients in healthcare settings (Haas and Larson, 2007). Hand hygiene dramatically decreases the potential pathogens on hands and is considered the first measure for decreasing the risk of transmitting organisms to patients, healthcare professionals, and family members. Noncompliance with hand hygiene practices has been shown to increase healthcare-associated infections, costing hospitals $35.7-$45 billion each year (Centers for Disease Control and Prevention [CDC], 2012). Education about hand hygiene starts in school and should transfer into the real world of nursing. The purpose of this research is to determine how student nurses in a baccalaureate nursing program in northeastern Tennessee perceive hand hygiene and the importance of conducting the act of hand washing. Students who do not perceive it as important, or do not have the correct information, are unlikely to use principles of good hand hygiene in their practice. Few studies were found assessing nursing school students’ perception of the importance of hand hygiene.
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Bazile, Christophe. "Identification des couplages information-mouvement impliqués dans la régulation de la tâche de de frappe cyclique de balle et leur développement chez l’enfant âgé de 5 à 12 ans." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA113009.
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L’objectif de cette thèse est à la fois d’identifier les couplages information-mouvement impliqués dans la régulation d’une coordination visio-manuelle rythmique (tâche de frappe cyclique de balle) et également leur développement entre 5 et 12 ans. Dans un premier temps l’étude 1 a montré que la période de raquette (Tr) est couplée à la durée de la phase ascendante de la trajectoire de balle (tup) et que la variation de vitesse de raquette à l’impact (Δvr) est quant à elle couplée à l’erreur de rebond de balle à la cible (ε). Dans un second temps, les études 2 et 3 ont montré que de 5 à 7 ans les enfants montrent une très faible capacité de régulation cycle-à-cycle et adoptent un comportement moteur stéréotypé caractérisé par unehaute fréquence d’oscillation de raquette. Entre 7 et 12 ans le premier couplage information mouvement qui émerge est celui entre Tr à la hauteur de rebond de balle (hp) tandis que Δvrn’ai pas encore régulée. C’est à partir de l’âge de 11-12 ans que les premiers passages d’un couplage de Tr d’une information visuelle spatiale (hp) à l’information visuelle temporelle référence sont observés. L’évolution avec l’âge de la nature des couplages information mouvement impliqués dans la régulation de la tâche notamment au niveau des informations impliquées est en accord avec la séquence développementale du Freezing-Freeing-Exploiting(Savelsbergh & Van der Kamp ; 2000, 2003). Enfin, l’étude 4 a permis de montrer que leenfants âgés de 9 à 12 ans adoptaient un comportement oculaire similaire de fixation du regard au niveau de la cibleThis thesis aims to both identify the information-movement couplings involved in the regulation of rhythmical hand-eye coordination (ball-bouncing task) and their development in children aged from 5 to 12 years old. Study 1 showed that racket period (Tr) is coupled to the duration of the ascending phase of the ball trajectory (tup) while the variation of racket velocity at impact (Δvr) is coupled to bounce error (ε). Studies 2 and 3 showed both poorcycle-to-cycle regulation ability and stereotyped behavior (characterized by a high racket frequency) in children aged from 5 to 7. From 7 to 12, results showed the emergence of the first information-movement coupling between Tr and the ball peak height while Δvr still remains not regulated. Since the age of 11-12, the first shifts from space- (hp) to time-relatedinformation (tup) in the control of Tr are observed. Developmental dynamics related to thenature of informaiton-movement couplings and the source of information involved is in accordance with the Freezing-Freeing-Exploiting developmental sequence proposed by (Savelsbergh & Van der Kamp ; 2000, 2003). Finally, study 4 showed that both children from9 to 12 and adults fixated their gaze at a location closed the target height while performing the task