Dissertations / Theses: 'Individual recognition'

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Chiroro, Patrick. "Individual differences in recognition memory for faces." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/1217/.

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Contemporary research on human memory has tended to disregard individual differences (Eysenck, 1977, 1983; Sternberg & French, 1990). However, there seems to be no empirical justification for this practice, especially in experimental situations where the stimuli that are used are 'socially relevant'. Human faces constitute one such category. Although there is strong evidence which suggests that people differ substantially in their ability to recognise faces in laboratory experiments (Baddeley & Woodhead, 1983) and in everyday situations (Schweich, van der Linden, Bredart, Bruyer, Neils & Schills, 1991), the sources of these differences are not clearly understood at present. In this thesis, individual differences in recognition memory for faces were examined using standard laboratory experimental techniques. Part I of this thesis consists of four chapters. Chapter One provides a general introduction to face recognition research. In Chapter Two, past research on individual differences in face recognition is described and evaluated. In Chapter Three. the theoretical implications of research on the effects of orientation, race of face and face distinctiveness are discussed. Experimental and statistical techniques that are used in the present thesis are summarised in Chapter Four. In Part II, three experiments which investigated the effect of individual differences in spatial ability on recognition of pictures, faces and words are reported. Among other things, these experiments showed that while individual differences in spatial ability did not significantly affect subjects' recognition of high-imagery words, high spatial ability subjects recognised faces and pictures more accurately and more quickly than did low spatial ability subjects. The theoretical implications of these results are discussed. Part III consists of an experiment in which differences in recognition of male and female faces by adolescent male and female subjects aged 11 years, 12 years and 13 years were investigated across two delay conditions. This experiment provided partial support for a developmental dip in recognition of faces among 12-year olds and also showed an own-sex bias in face recognition among female subjects. Theoretical accounts for these effects are proposed. In Part IV, a cross-cultural study in which black-African and white-British subjects who had different degrees of previous contact with faces of the opposite race were tested for their recognition of distinctive and typical own-race and other-race faces is reported. This experiment provided evidence which supported the differential-experience hypothesis of the own-race bias in face recognition among the African subjects and also suggested that the effect of face distinctiveness in recognition of faces might be a product of learning the defining characteristics of a given population of faces. In Part V, three experiments which explored differences between good and poor face recognisers are reported and discussed. These experiments raised some important methodological issues regarding the generalisability of the notion of 'face recognition ability' in situations where the faces to be recognised are shown in different views, in different facial expressions and in different orientations between study and test. These experiments also showed that subjects who were good in their recognition of faces following a change in view were significantly more accurate in their recognition of upsidedown faces than were subjects who had initially shown poor recognition of faces in different views. However. there were no significant differences between these two groups of subjects in their ability to recognise faces that were shown in different facial expressions between study and test. It is argued that these results suggest that recognition of faces following a change in facial expression may involve the creation and use of expression-independent representations of the face while recognition of faces following a change in view or orientation may both involve the creation and use of view-independent representations of faces. General conclusions and suggestions for future experimental work are outlined in Part

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Zubko, Olga. "The source of individual differences in face recognition." Thesis, University of Kent, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590070.

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For most of us, recognising a face is effortless and instantaneous, yet there are striking differences between individuals' ability to do so. Although several models of face recognition have been proposed (see Ellis & Young, 1990; Bruce & Young, 1986), no systematic investigation of how individual differences might arise at each stage of face processing exists. To this end, the current thesis sought to identify the sources of individual variability in face processing. Seven stages of face processing consisting of the ability to: (i) disregard incidental properties, (ii) code 1 st order relations, (iii) code 2nd order relations as well as (iv) retain information in short-term memory, (v) retrieve semantic information (vi) filter out visual distracters and (vii) engage in a task were examined. Using an old/new paradigm, participants were first categorized into 'good' or 'poor' face recognizers. Then their performance under each of the experimental conditions, designed to probe the seven key stages of face recognition, was assessed. Individual differences emerged at four of the seven stages investigated: First, 'good' recognizers were more sensitive to targets than poor performers when 40 faces (high load) had to be remembered, suggesting that they were able to maintain more faces in memory. Next, good performers were more sensitive to target faces during both upright and inverted conditions suggesting that they shifted more flexibly between local and global processing strategies. Differences in face recognition were also predicted by the ability to filter out visual distracters. That is, good performers became less sensitive to target faces when the number of distracter faces increased from 1 to 5, whilst poor performers did not. This ability also distinguished between face recognition of congenital prosopagnosics and individuals without reported face processing difficulties. The fourth key finding from this thesis is that individual differences in face processing can be partly accounted by volitional factors associated with motivation and task engagement. In sum, this thesis identifies factors which can explain why 'some individuals never forget a face' whilst others do, and establishes conditions under which these differences are eliminated. The following chapters discuss these findings with reference to current theories of face recognition. Wider implications including the development of new strategies with which to enhance face recognition performance are also discussed.

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Elenius, Daniel. "Accounting for Individual Speaker Properties in Automatic Speech Recognition." Licentiate thesis, KTH, Speech Communication and Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12258.

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In this work, speaker characteristic modeling has been applied in the fields of automatic speech recognition (ASR) and automatic speaker verification (ASV). In ASR, a key problem is that acoustic mismatch between training and test conditions degrade classification per- formance. In this work, a child exemplifies a speaker not represented in training data and methods to reduce the spectral mismatch are devised and evaluated. To reduce the acoustic mismatch, predictive modeling based on spectral speech transformation is applied. Follow- ing this approach, a model suitable for a target speaker, not well represented in the training data, is estimated and synthesized by applying vocal tract predictive modeling (VTPM). In this thesis, the traditional static modeling on the utterance level is extended to dynamic modeling. This is accomplished by operating also on sub-utterance units, such as phonemes, phone-realizations, sub-phone realizations and sound frames.

Initial experiments shows that adaptation of an acoustic model trained on adult speech significantly reduced the word error rate of ASR for children, but not to the level of a model trained on children’s speech. Multi-speaker-group training provided an acoustic model that performed recognition for both adults and children within the same model at almost the same accuracy as speaker-group dedicated models, with no added model complexity. In the analysis of the cause of errors, body height of the child was shown to be correlated to word error rate.

A further result is that the computationally demanding iterative recognition process in standard VTLN can be replaced by synthetically extending the vocal tract length distribution in the training data. A multi-warp model is trained on the extended data and recognition is performed in a single pass. The accuracy is similar to that of the standard technique.

A concluding experiment in ASR shows that the word error rate can be reduced by ex- tending a static vocal tract length compensation parameter into a temporal parameter track. A key component to reach this improvement was provided by a novel joint two-level opti- mization process. In the process, the track was determined as a composition of a static and a dynamic component, which were simultaneously optimized on the utterance and sub- utterance level respectively. This had the principal advantage of limiting the modulation am- plitude of the track to what is realistic for an individual speaker. The recognition error rate was reduced by 10% relative compared with that of a standard utterance-specific estimation technique.

The techniques devised and evaluated can also be applied to other speaker characteristic properties, which exhibit a dynamic nature.

An excursion into ASV led to the proposal of a statistical speaker population model. The model represents an alternative approach for determining the reject/accept threshold in an ASV system instead of the commonly used direct estimation on a set of client and impos- tor utterances. This is especially valuable in applications where a low false reject or false ac- cept rate is required. In these cases, the number of errors is often too few to estimate a reli- able threshold using the direct method. The results are encouraging but need to be verified on a larger database.

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Abraham, Ashley N. Dr. "Individual differences in lexical context effects during word recognition." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1605262896060915.

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Bradshaw, Richard H. "Agonistic behaviour and individual recognition in groups of laying hens." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276581.

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Hughes, Benjamin. "Automated detection and shape based recognition of individual great white sharks." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701973.

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Systems that classify images by the individual animals they contain have widespread applicability in field-based ecology and conservation research, allowing individuals to be recognised repeatedly in a non-invasive way. The aim of this thesis is the design of such systems for animal species where individuals exhibit visually unique body morphologies, with the specific objective that individuals are recognised fully automatically. A two-stage approach is adopted to achieve this objective, as illustrated for the task of recognising individual great white sharks. First, a model is trained for automatic object part detection that combines a partitioning of ultrametric contour maps with shape descriptions and dense local features. This provides robust part detection but fine-grained segmentation accuracy is sacrificed in favour of computational efficiency. As such the approach is complemented by affinity matting for local edge refinement. The combination of part detection and affinity matting achieves robust, efficient and pixel accurate biometric contour detection. Second, a generative model combines evidence provided by densely sampled, multiscale local shape descriptions for biometric contour classification. The approach provides a discriminative representation of individuality while demonstrating robustness to sources of intra-individual variability introduced by partial occlusions and automatic shape detection errors. As an additional contribution, the distribution of individuality in dimensions of smoothing-filter scale, spatial location and descriptor complexity is quantified. Insights are provided to guide processes of image acquisition, shape representation, and efficient shape extraction. Finally, the generality of the contour representation is presented alongside a novel framework for discriminative cue combination in an application to individual humpback whale recognition. A detailed evaluation of the major system components is provided with results demonstrating fully automatic individual classification performance at accuracy and efficiency levels ready to assist human identification efforts.

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Talbot, Catherine F. "Performance on a Face Discrimination Task by Orangutans Reflects a Possible Interaction between Familiarity and Novelty." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/psych_theses/92.

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Faces provide humans with information on the age, sex, individual identity, and emotional state of others. Although comparatively less is known about nonhuman primates’ face processing abilities, several gregarious group living species are able to discriminate conspecific faces. Here, we tested a less gregarious species, orangutans, to determine if they exhibit similar skills. Using a matching-to-sample paradigm, orangutans matched two identical portraits of unfamiliar orangutans. Next, subjects matched two different photographs of the same individual across viewpoints. During testing, subjects successfully transferred to novel photographs of familiar, but not unfamiliar, individuals with their first exposure to these stimuli. However, performance was not maintained throughout continued exposure to these stimuli, suggesting a possible novelty effect. Interestingly, orangutans performed significantly above chance when individuating familiar males, but not females. Further examination is needed to understand social organization and other social factors which were important in the evolution of face-processing.

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Dalrymple-Alford, Joseph. "Does vocabulary knowledge influence speech recognition in adverse listening conditions?" Thesis, University of Canterbury. Communication Disorders, 2014. http://hdl.handle.net/10092/9334.

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Purpose: To investigate the effects of vocabulary, working memory, age, semantic context, and signal-to-noise-ratio (SNR) on speech recognition in adverse conditions (multitalker babble) in normal-hearing listeners aged 18-35. First, a general hypothesis was tested that listeners with larger receptive vocabularies would be more accurate at recognising speech in noise than listeners with more limited receptive vocabularies, even when target stimuli are words with high lexical frequency. A second more specific hypothesis was that the vocabulary would be predictive of speech recognition accuracy when the signal was moderately degraded, but not mildly or severely degraded. Method: 80 sentences with a high (HP) or low (LP) degree of semantic predictability (40 HP and 40 LP) were recorded from a male speaker of NZ English. These sentences were used as experimental target stimuli, and presented in multitalker babble at four SNRs: -8, -4, 0 and 4 dB SNR. Thirty-five participants (11 males and 24 females, aged 18 to 35), with puretone hearing thresholds of 15 dB HL or better, completed the Peabody Picture Vocabulary Test (PPVT) and the Wechsler Adult Intelligence Scale (WAIS) vocabulary subtest, the WAIS working memory subtests, and the experimental listening task in which they were required to repeat back the target sentences. Results: There was considerable variability between listeners in speech recognition performance, in terms of percent words accurately recognised overall (M = 45.8%; SD = 7.4) and for both HP (M = 54.4%; SD = 9.8) and LP (M = 35%; SD = 8.9) conditions. Hierarchical multiple regression analyses revealed that receptive (PPVT) and productive (WAIS) vocabulary knowledge, but not working memory, contributed 8 significant variance to listeners’ speech recognition scores overall and in both the HP and LP conditions. Further regression analyses at individual SNR levels showed that receptive vocabulary contributed significant variance to listening recognition scores in all predictability and SNR conditions except the most favourable (HP stimuli at 4 dB SNR) and least favourable (LP stimuli at -8 dB SNR) listening conditions. Working memory and age were not significantly related to overall listening score, HP listening score, or LP listening score, but age did contribute significant variance in the - 4dB SNR LP condition. Conclusion: The results provide further evidence that greater vocabulary knowledge is associated with improved speech recognition in adverse conditions. This effect was salient in mid-range adverse listening conditions, but was not apparent in highly favourable and extremely poor listening conditions. The results were interpreted to suggest that in moderately adverse listening conditions listeners with larger lexicons may be better able to exploit redundancies and/or intelligible ‘glimpses’ in the speech signal.

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Dempsey, Katherine. "Monitoring individual cells within cell cultures using image processing and pattern recognition techniques." Thesis, Keele University, 2017. http://eprints.keele.ac.uk/4179/.

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Cells are the building blocks of the human body which are normally specialised by type in accordance with their function. Human cells interact with each other to form the tissues that make up the body. Consequently, it is important to study the behaviour and interactions of these cells at the microscale level, so that the causes of cellular irregularities can be identified; and, possible treatments can be devised. This project aimed to create algorithms that were capable of tracking a variety of cells types within both single cultures and mixed cultures, and from this generate data that was relevant to current clinical trials. There have been successes in tracking some cells types, most notably articular chondrocytes and spinal disk cells. In terms of data generated there has been successes in a whole variety of different types of clinical trials. The algorithms used here have been able to identify the point of mitosis. They have created a better method of determining neural growth and from this have shown that neurons co-cultured with MCSs can grow in places with neural inhibitors. Through the use of algorithms that can analyse culture in three dimensional structures it has been shown that neurons are more affected by topographical cues than chemical cues in their direction of growth. It has also been shown that vesicles are more likely to appear on smaller back disk cells. In the study of gels, it has been found that the more transparent gels are better for imaging. Finally, it has been shown that MSCs and chondrocytes behave differently when in single and co-cultures. These discoveries would not have been possible without the use of the algorithms that allowed for the study of individual cells within a larger culture.

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Pitcher, Benjamin James. "Individual recognition systems and multimodal signalling in the Australian sea lion, Neophoca cinerea." Paris 11, 2010. http://www.theses.fr/2010PA11T056.

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Dlamini, Gciniwe. "Machine learning methods for individual acoustic recognition in a species of field cricket." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29619.

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Crickets, like other insects, play a vital role in maintaining a balance in the ecosystem. Therefore, the ability to identify individual crickets is crucial as it enables ecologists to estimate important population metrics such as population densities, which in turn are used to investigate ecological questions pertaining to these insects. In this research, classification models were developed to recognise individual field crickets of the species Plebeiogryllus guttiventris based solely on the audio recordings of their calls. Recent advances in technology have made data collection easier, and consequently, large volumes of data, including acoustic data, have become available to ecologists. The task of acoustic animal identifications thus requires the utilisation of models that are well suited for training large datasets. It is for this very reason that convolutional neural networks (CNN) and recurrent neural networks (RNN) were utilised in this research. The results of these models were compared to results of a baseline random forest (RF) model as RFs can also be used to make acoustic classifications. Mel-frequency cepstral coefficients (MFCC), raw acoustic samples as well as two temporal features were extracted from each chirp in the cricket recordings and used as inputs to train the machine learning models. The raw acoustic samples were only used in the deep neural network (DNN) models (CNNs and RNNs) as these models have been successful in training other raw forms of data such as images (for example, Krizhevsky et al. (2012)). Training on the MFCC features was conducted in two ways: the DNN models were trained on MFCC matrices that each spanned a chirp, whereas the RF models were trained on the MFCC frame vectors. This is because RF are only able to train on vector representations of observations, not matrices. The frame-level MFCC predictions obtained from the RF model were then aggregated into chirp-level predictions to facilitate the comparison with the other classification models. The best classification performance was achieved by the RF model trained on the MFCC features with a score of 99.67%. The worst performance was observed from the RF model trained upon the temporal features, which scored 67%. The DNN models attained on average 98.6% classification accuracies when trained on both MFCC features and the raw acoustic samples. These results show that individual recognition of the crickets using acoustics can be achieved with great success through the use of machine learning. Moreover, the performance of the deep learning models when trained upon the raw acoustic samples indicate that the feature (MFCC) extraction step can be bypassed; the deep learning machine algorithms can be trained directly on the raw acoustic data and still achieve great results.

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Mauney, Lisa M. "Individual Differences in Cognitive, Musical, and Perceptual Abilities." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13972.

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The increasing use of auditory graphs and sonifications in technology is leading to a wider variety of system users, which, in turn, suggests a need for research in how differences between individual listeners affect sound interpretation. As a first step in this arena, the current study investigates the question of whether or not cognitive abilities and musical experience predict frequency and tempo discrimination in individuals. Participants in the study were 30 undergraduate students from Georgia Institute of Technology and 20 adults from the Atlanta, Georgia community. In the cognitive ability session, participants completed the Operation Span (Ospan) task as a measure of working memory capacity and the Ravens Progressive Matrices task as a measure of spatial reasoning. In the auditory discrimination session, participants performed a tempo and a frequency discrimination task. Demographics on age, gender, handedness, years of playing a musical instrument, and years of formal musical training were also collected. A correlational analysis of all variables was performed. Paired-samples t-tests on the Weber fractions of the six threshold means were also performed to determine if there were any significant differences between the frequency thresholds and the tempo thresholds. Lastly, multiple hierarchical regressions were performed on each of the six dependent variables to identify significant predictors of frequency and tempo discrimination. The paired samples t-tests show a significant difference between 250 Hz and 840 Hz and between 250 Hz and 1600 Hz, a violation of Webers Law. However, this violation of Webers Law may be explained by the small sample size used in the study. The t-tests also show a significant difference between the means of 150 ms and 250 ms and between the means of 250 ms and 350 ms. The results of the regression analyses show that good performance on Ravens seems to predict lower thresholds at 1600 Hz. The results also show that good scores on Ospan appear to predict lower thresholds at 350 ms ICI. In addition to these significant predictors from the regression analyses, there are many significant correlations that provide further support that cognitive abilities are related to frequency and tempo discrimination.

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Deibel, Megan E. "Individual Differences in Incidental Learning of Homophones During Silent Reading." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1594912994777369.

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Couroux, Christina. "Neighbor-stranger discrimination and individual recognition by voice in the American redstart (Setophaga ruticilla)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0027/MQ37111.pdf.

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Kerr, Sarah Elizabeth. "Do individual differences interact with lexical cues during speech recognition in adverse listening conditions?" Thesis, University of Canterbury. Communication Disorders, 2015. http://hdl.handle.net/10092/10473.

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Purpose: This thesis examines the effect of listener characteristics (i.e., cognition and vocabulary) and language-based factors (i.e., lexical frequency and phonological similarity) on speech recognition accuracy in adverse listening conditions. Method: Fifty listeners (40 females and 10 males) aged 18-33 years and with normal hearing (puretone thresholds ≤ 20 dB HL, 0.25-8 kHz) participated. They completed a speech perception experiment, which required listeners to repeat back non-sensical English phrases presented at a variety of signal-to-noise ratios (-5, -2, +1, and +4 dB SNRs). In addition, all listeners undertook assessments of vocabulary knowledge (PPVT-IV) and cognition (WAIS -IV). The primary dependent variable was individual content word recognition accuracy, and results were analysed using binomial mixed effects modelling. Results: Listeners demonstrated variability in their speech recognition abilities, and their vocabulary and cognitive scores. Statistical analysis revealed that listener-based factors affected word recognition. Listeners with faster processing speed and larger working memories exhibited higher word recognition accuracy. Surprisingly, listeners with higher non-verbal intelligence scores exhibited lower word recognition accuracy. Vocabulary knowledge interacted with SNR, such that as the listening conditions became more favourable, listeners with larger receptive vocabularies identified more words correctly. Similarly, main effects were also present for language-based factors. The more phonologically distinct a word was, the more likely it was to be correctly identified; higher frequency words were more likely to be accurately recognised. In addition, higher frequency words were identified more accurately at higher SNR levels. Finally, listener- and language-based factors interacted. The positive effect of working memory on word recognition was reversed as word frequency increased; on the other hand non-verbal intelligence’s negative influence on word recognition was reversed as word frequency increased. Conclusion: In the current cohort, listener and language-based factors interacted in the process of word recognition in noise. These results provide an insight into the underlying speech recognition mechanisms in adverse conditions. Further understanding of how these listener differences affect an individual’s speech processing may lead to the development of improved signal processing techniques and rehabilitation strategies.

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Carlson, Nora. "Anti-predator behaviour in UK tit species : information encoding, predator recognition, and individual variation." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/11366.

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To combat the ever-present threat of predation many species produce anti-predator vocalizations and behaviours (mobbing) designed to drive predators away. These vocalizations can encode a predator's threat level, and many species within a community will eavesdrop on this information. To determine how prey species produce, use, and respond to anti-predator information and how individual, social, and phylogenetic factors of different species may influence this behaviour, I conducted a series of robotic-predator presentation and anti-predator vocalization playback experiments in the wild and lab. I predicted that UK Paridae would encode information the same as previously studied species. I found that UK Paridae encode predator information in different ways, and that neither phylogeny nor ecology explained the patterns of similarity in how different species encode predator threat in their calls. Flock structure appeared to affect how species encoded predator threat and while multiple species may be sources of information for familiar flock mates, only blue and great tits met the criteria to be community informants. As blue and great tits need prior experience to recognize novel predators and juvenile great tits avoid novel predators only after seeing adults mob them, tits may use mobbing calls to learn about novel predators. While they responded to mobbing calls, juvenile blue and great tits did not engage in mobbing behaviour although they appear capable of doing so. Furthermore, while individuals varied in their responses to aerial alarm calls this variation was not explained by either their proximity to the call nor their personality. In this close examination of how anti-predator vocalizations are produced and used by UK Paridae, I found variation in these signals. This challenges previous assumptions about how Paridae encode information, raising questions as to the sources of this variation.

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Aryananda, Lijin 1975. "A few days of a robot's life in the human's world : toward incremental individual recognition." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40495.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.
Includes bibliographical references (p. 234-244).
This thesis presents an integrated framework and implementation for Mertz, an expressive robotic creature for exploring the task of face recognition through natural interaction in an incremental and unsupervised fashion. The goal of this thesis is to advance toward a framework which would allow robots to incrementally "get to know" a set of familiar individuals in a natural and extendable way. This thesis is motivated by the increasingly popular goal of integrating robots in the home. In order to be effective in human-centric tasks, the robots must be able to not only recognize each family member, but also to learn about the roles of various people in the household. In this thesis, we focus on two particular limitations of the current technology. Firstly, most of face recognition research concentrate on the supervised classification problem. Currently, one of the biggest problems in face recognition is how to generalize the system to be able to recognize new test data that vary from the training data. Thus, until this problem is solved completely, the existing supervised approaches may require multiple manual introduction and labelling sessions to include training data with enough variations. Secondly, there is typically a large gap between research prototypes and commercial products, largely due to lack of robustness and scalability to different environmental settings.
(cont.) In this thesis, we propose an unsupervised approach which would allow for a more adaptive system which can incrementally update the training set with more recent data or new individuals over time. Moreover, it gives the robots a more natural social recognition mechanism to learn not only to recognize each person's appearance, but also to remember some relevant contextual information that the robot observed during previous interaction sessions. Therefore, this thesis focuses on integrating an unsupervised and incremental face recognition system within a physical robot which interfaces directly with humans through natural social interaction. The robot autonomously detects, tracks, and segments face images during these interactions and automatically generates a training set for its face recognition system. Moreover, in order to motivate robust solutions and address scalability issues, we chose to put the robot, Mertz, in unstructured public environments to interact with naive passersby, instead of with only the researchers within the laboratory environment. While an unsupervised and incremental face recognition system is a crucial element toward our target goal, it is only a part of the story. A face recognition system typically receives either pre-recorded face images or a streaming video from a static camera.
(cont.) As illustrated an ACLU review of a commercial face recognition installation, a security application which interfaces with the latter is already very challenging. In this case, our target goal is a robot that can recognize people in a home setting. The interface between robots and humans is even more dynamic. Both the robots and the humans move around. We present the robot implementation and its unsupervised incremental face recognition framework. We describe an algorithm for clustering local features extracted from a large set of automatically generated face data. We demonstrate the robot's capabilities and limitations in a series of experiments at a public lobby. In a final experiment, the robot interacted with a few hundred individuals in an eight day period and generated a training set of over a hundred thousand face images. We evaluate the clustering algorithm performance across a range of parameters on this automatically generated training data and also the Honda-UCSD video face database. Lastly, we present some recognition results using the self-labelled clusters.
by Lijin Aryananda.
Ph.D.

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Herzmann, Grit. "Individual differences in face cognition." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2008. http://dx.doi.org/10.18452/15789.

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Zusammenhänge zwischen neurokognitiven Indikatoren und Verhaltensindikatoren der Gesichterkognition können Gehirnsysteme und neuronale Subprozesse identifizieren, die individuellen Unterschieden im Verhalten zugrunde liegen. Diese Dissertation zeigt, dass Ereigniskorrelierte Potentiale (EKPs) als neurokognitive Indikatoren für die Erforschung individueller Unterschiede eingesetzt werden können, denn sie weisen die gleichen hohen psychometrischen Qualitäten wie andere Fähigkeitsindikatoren auf und messen daher individuelle Unterschiede in der neuronalen Verarbeitung zuverlässig und stabil über die Zeit. Auf der Verhaltensebene wurden drei Teilfähigkeiten der Gesichterkognition etabliert: Gesichterwahrnehmung, Gesichtergedächtnis und Gesichtergeschwindigkeit. EKPs wurden in Strukturgleichungsmodellen verwendet, um den Beitrag neurokognitiver Indikatoren an individuellen Unterschieden dieser Gesichterkognitionsfähigkeiten zu schätzen. Für 85 Probanden wurden Beziehungen zwischen den Gesichterkognitionsfähigkeiten und der P100, N170, der sogenannten Differenz aufgrund des Gedächtnisses (Dm) und dem frühen sowie späten Wiederholungseffekt (ERE und LRE) etabliert. Spezifische Anteile individueller Unterschiede in der Gesichterkognition auf der Verhaltensebene wurden durch individuelle Unterschiede im Zeitverlauf der strukturellen Gesichteranalyse (N170 Latenz) sowie in der Reaktivierung von Repräsentationen gespeicherter Gesichtsstrukturen (ERE) als auch personen-spezifischen Wissens (LRE) erklärt. Keinen Anteil an individuellen Unterschieden erklärten hingegen frühe Wahrnehmungsprozesse (P100), die neuronale Aktivierung während der strukturellen Gesichteranalyse (N170 Amplitude) und Prozesse der Gedächtnisenkodierung von Gesichtern (Dm). Diese Ergebnisse zeigen, dass individuelle Unterschiede in der Gesichterkognition von der strukturellen Gesichteranalyse sowie von der Effizienz und Geschwindigkeit des Zugriffs auf Gedächtnisinhalte zu Gesichtern und Personen abhängt.
Individual differences in perceiving, learning, and recognizing faces were shown on the behavioral and neural level but were rarely related to one another. By determining relationships between behavioral and neurocognitive indicators of face cognition, brain systems and neural sub-processes can be identified that underlie individual variations on the behavioral level. The present dissertation laid the foundation for using event-related potentials (ERPs) as neurocognitive indicators in individual differences research. ERP components were shown to possess the same high psychometric qualities as behavioral ability measures and thus to measure individual differences of neural processing reliably and stably across time. On the behavioral level, three component abilities of face cognition were established: face perception, face memory, and the speed of face cognition. ERP components were used in structural equation models that estimated contributions of neurocognitive indicators to the individual differences in these face cognition abilities. Regression analysis was used to determine the contributions of P100, N170, the so called difference due to memory (Dm), as well as early and late repetition effects (ERE and LRE) to face cognition abilities in 85 participants. Certain amounts of variance in face cognition as seen on the behavioral level were accounted for by individual differences in the temporal dimension of structural encoding of a face (N170 latency) and in the re-activation of both stored facial structures (ERE) and person-identity information (LRE). In contrast, processes of early vision (P100), the neural activation of structural face encoding (N170 amplitude), and memory encoding of new faces (Dm) did not show any contribution to individual differences in face cognition. These findings show that individual differences in face cognition depend on the speed of structurally encoding faces and on the efficiency and speed of accessing face and person memory.

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19

Hayes, Maureen. "Individual differences in word recognition in relation to the Paap and Noel (1991) dual task paradigm." Thesis, University of Essex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390989.

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20

Button, Andrea. "The Rescuers: intersections of individual and group activism and the recognition of the human-animal “Link”." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20584.

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Doctor of Philosophy
Department of Sociology, Anthropology, and Social Work
Gerad Middendorf
Academics, victims, and advocates have increasingly brought attention to the need for programs and policies to protect and shelter nonhuman victims of domestic violence. Research focused on the “Link” between human-based violence and violence against animals has played a significant role in the creation of these programs, and has prompted a more holistic approach to providing services to all victimized family members. In this dissertation, I focus on the unique origin points of several animal-friendly domestic violence organizations and the models used to serve both human and nonhuman victims, as well as on the individual advocacy and activism of animal-friendly domestic violence organization workers. Data collection from semi-structured interviews with thirty domestic violence workers and advocates provides the foundation for my investigation of the importance of community networks and individual identity as a source of professional navigation of the connected spheres of domestic violence and animal abuse. This study extends the ever-growing collection of research on the “Link” and on the broader discipline of human-animal studies. Finally, this research provides an additional perspective on the use of personal and collective identity to engage in advocacy on behalf of nonhuman victims of domestic violence.

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Roberts, Briony Z. Jr. "Dialects, Sex-specificity, and Individual Recognition in the Vocal Repertoire of the Puerto Rican Parrot (Amazona vittata)." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/79692.

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The following study is part of a larger study examining techniques that might be of use in the release program of the Puerto Rican Parrot (Amazona vittata), including marking, capturing, and radio-tracking. The portion of the study reported here documents the vocal behavior of A. vittata during the reproductive season and examines the possibility of using vocalizations to identify individuals, determine the sex of individuals and determine the location of an individual's breeding territory. Objectives of this study included: 1) cataloguing and categorizing the vocal repertoire of A. vittata, 2) determining whether the vocal repertoire was sex-specific and region-specific and 3) determining if an individual's vocal repertoire could be used to identify it. The vocal repertoire was characterized using a hierarchical method and 147 calls were described. The repertoire was found contain a high percentage (76 %) of graded calls. Evolutionary strategies that may explain the complexity of such a repertoire are discussed. The vocal repertoire was found to be both sex- and region-specific. Characteristics analyzed included time and frequency parameters of sonagrams. Three methods were used to determine the feasibility of vocal recognition of individuals. These methods included: bird-call pairing, sonagraphic analysis, and linear predictive coding. Sonagraphic analyses in combination with linear predictive coding techniques show the most promise as tools in voice recognition of the parrot, however, further research will be necessary to determine how reliable voice recognition may be as a method for identifying individuals in the field.
Master of Science

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22

Szostak, Christine. "Individual Differences in Working Memory Capacity Influence Spoken WordRecognition." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365177772.

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23

Aglieri, Virginia. "Behavioural and neural inter-individual variability in voice perception processes." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0176/document.

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Chez l'homme, la voix facilite les interactions sociales par la transmission d’informations sur l'identité de la personne, ses émotions ou sa personnalité. En particulier, l'identité du locuteur peut être automatiquement extraite même lorsque le message et l'état émotionnel varient, ce qui suggère des mécanismes cognitifs et cérébraux partiellement dissociables pour ces processus. Cependant, la reconnaissance d'une voix familière ou la discrimination entre deux locuteurs sont, pour certains sujets, non seulement non-automatiques, mais même impossibles. Ce déficit, lorsqu'il se manifeste dès la naissance, est appelé phonagnosie du développement et constitue la contrepartie auditive de la prosopagnosie (déficit de reconnaissance des visages). Dans le domaine visuel, il a été proposé que les sujets affectés par la prosopagnosie du développement représentent des cas extrêmes dans la distribution des capacités de reconnaissance de visages. A l’inverse, des "super-reconnaisseurs" des visages se situaient à l’opposé de cette distribution.Comme la distribution des capacités de reconnaissance de la voix dans la population générale était encore inconnue, le premier objectif de cette thèse a été d'en étudier les différences individuelles au moyen d'un court test - le Glasgow Voice Memory Test (GVMT). Les résultats obtenus ont reflété une large variabilité interindividuelle dans les capacités de reconnaissance des voix: parmi une cohorte de 1120 sujets, il y avait à la fois des sujets avec des performances significativement en dessous de la moyenne (potentiels phonagnosiques) et des "super-reconnaisseurs" des voix. Cette variabilité individuelle comportementale semblerait se refléter au niveau cérébral, comme révélés par l'imagerie par résonance magnétique fonctionnelle (IRMf) : en fait, il a été montré précédemment qu'il existait une variabilité interindividuelle considérable dans le signal BOLD (blood-oxygen level dependent) lié à la voix dans les zones temporales de la voix (TVAs). Ces régions sont situées sur le bord supérieur des sulcus/gyrus temporal supérieur (STS/STG) et montrent une activation préférentielle pour les sons vocaux plutôt que non vocaux. Le deuxième objectif de ce travail fut de mieux caractériser le lien entre les mécanismes comportementaux et neuronaux sous-tendant la variabilité interindividuelle dans les processus de reconnaissance des voix. Pour cela, nous avons examiné comment la perception de la voix modulait la connectivité fonctionnelle entre les TVAs, constituant le "noyau" du réseau de perception de la voix, et les régions frontales également sensibles aux voix, constituant une extension de ce réseau. Les résultats ont montré qu'il y avait une connectivité fonctionnelle positive dans l'ensemble du réseau et que la connectivité fonctionnelle fronto-temporelle et fronto-frontale droite augmentait avec les scores obtenus lors du GVMT.Pour compléter ce travail, nous avons réalisé une autre étude IRMf en utilisant des analyses multivariées, afin de clarifier les corrélats neuronaux de la reconnaissance du locuteur mais aussi le lien entre sensibilité cérébrale à la voix et capacités de reconnaissance du locuteur. Pour cela, des sujets ayant des capacités de reconnaissance vocale hétérogènes ont été soumis à la fois à une tâche d'identification du locuteur et à une tâche d'écoute passive de sons vocaux et non vocaux. Les résultats ont confirmé que l’identification du locuteur s’effectuait via un réseau étendu de régions, incluant les TVAs mais aussi des régions frontales. De plus, nous avons observé que le score de classification voix/non-voix dans le STS droit permettait de prédire les capacités d'identification des locuteurs.Dans l'ensemble, ces résultats suggèrent que les capacités de reconnaissance vocale varient considérablement d'un individu à l'autre et que cette variabilité pourrait être le reflet de profils d’activité cérébrale différents au sein du réseau de la perception de la voix
In humans, voice conveys heterogeneous information such as speaker’s identity, which can be automatically extracted even when language content and emotional state vary. We hypothesized that the ability to recognize a speaker considerably varied across the population, as previously observed for face recognition. To test this hypothesis, a short voice recognition test was delivered to 1120 subjects in order to observe how voice recognition abilities were distributed in the general population. Since it has been previously observed that there exists a considerable inter-individual variability in voice-elicited activity in temporal voice areas (TVAs), regions along the superior temporal sulcus/gyrus (STS/STG) that show preferentially activation for voices than other sounds, the second aim of this work was then to better characterize the link between the behavioral and neural mechanisms underlying inter-individual variability in voice recognition processes through functional magnetic resonance imaging (fMRI). The results of a first fMRI study showed that functional connectivity between frontal and temporal voice sensitive regions increased with voice recognition scores obtained at a voice recognition test. Another fMRI study showed that speaker’s identity was treated in an extended network of regions, including TVAs but also frontal regions and that voice/non-voice classification accuracy in right STS increased with speaker identification abilities. Altogether, these results suggest that voice recognition abilities considerably vary across subjects and that this variability can be mirrored by different neural profiles within the voice perception network

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24

Squires, Susan E. G. "Age and individual differences in infant visual attention and oral exploration during an object examination task /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,156581.

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Tripovich, Joy Sophie. "Acoustic communication in Australian fur seals." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1690.

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Communication is a fundamental process that allows animals to effectively transfer information between groups or individuals. Recognition plays an essential role in permitting animals to distinguish individuals based upon both communicatory and non-communicatory signals allowing animals to direct suitable behaviours towards them. Several modes of recognition exist and in colonial breeding animals which congregate in large numbers, acoustic signalling is thought to be the most effective as it suffers less from environmental degradation. Otariid seals (fur seals and sea lions) are generally colonial breeding species which congregate at high densities on offshore islands. In contrast to the other Arctocephaline species, the Australian fur seal, Arctocephalus pusillus doriferus, along with its conspecific, the Cape fur seal, A. p. pusillus, display many of the behavioural traits of sea lions. This may have important consequences in terms of its social structure and evolution. The acoustic communication of Australian fur seals was studied on Kanowna Island, Bass Strait, Australia. Analysing the acoustic structure of vocalisations and their use facilitates our understanding of the social function of calls in animal communication. The vocal repertoires of males, females, pups and yearlings were characterised and their behavioural context examined. Call structural variations in males were evident with changes in behavioural context, indicating parallel changes in the emotive state of sender. For a call to be used in vocal recognition it must display stereotypy within callers and variation between them. In Australian fur seal females and pups, individuals were found to have unique calls. Mutual mother-pup recognition has been suggested for otariids and this study supports the potential for this process to occur through the use of vocalisations. Call structural changes in pup vocalisations were also investigated over the progression of the year, from birth to weaning. Vocalisations produced by pups increased in duration, lowered in both the number of parts per call and the harmonic band containing the maximum frequency as they became older, suggesting calls are changing constantly as pups grow toward maturity. It has been suggested through descriptive reports, that the bark call produced by males is important to vocal recognition. The present study quantified this through the analysis of vocalisations produced by male Australian fur seals. Results support descriptive evidence suggesting that male barks can be used to discriminate callers. Traditional playback studies further confirmed that territorial male Australian fur seals respond significantly more to the calls of strangers than to those of neighbours, supporting male vocal recognition. This study modified call features of the bark to determine the importance to vocal recognition. The results indicate that the whole frequency spectrum was important to recognition. There was also an increase in response from males when they heard more bark units, indicating the importance of repetition by a caller. Recognition occurred when males heard between 25-75% of each bark unit, indicating that the whole duration of each bark unit is not necessary for recognition to occur. This may have particular advantages for communication in acoustically complex breeding environments, where parts of calls may be degraded by the environment. The present study examined the life history characteristics of otariids to determine the factors likely to influence and shape its vocal behaviour. Preliminary results indicate that female density, body size and the breeding environment all influence the vocal behaviour of otariids, while duration of lactation and the degree of polygyny do not appear to be influential. Understanding these interactions may help elucidate how vocal recognition and communication have evolved in different pinniped species.

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26

Tripovich, Joy Sophie. "Acoustic communication in Australian fur seals." University of Sydney, 2006. http://hdl.handle.net/2123/1690.

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Doctor of Philosophy(PhD)
Communication is a fundamental process that allows animals to effectively transfer information between groups or individuals. Recognition plays an essential role in permitting animals to distinguish individuals based upon both communicatory and non-communicatory signals allowing animals to direct suitable behaviours towards them. Several modes of recognition exist and in colonial breeding animals which congregate in large numbers, acoustic signalling is thought to be the most effective as it suffers less from environmental degradation. Otariid seals (fur seals and sea lions) are generally colonial breeding species which congregate at high densities on offshore islands. In contrast to the other Arctocephaline species, the Australian fur seal, Arctocephalus pusillus doriferus, along with its conspecific, the Cape fur seal, A. p. pusillus, display many of the behavioural traits of sea lions. This may have important consequences in terms of its social structure and evolution. The acoustic communication of Australian fur seals was studied on Kanowna Island, Bass Strait, Australia. Analysing the acoustic structure of vocalisations and their use facilitates our understanding of the social function of calls in animal communication. The vocal repertoires of males, females, pups and yearlings were characterised and their behavioural context examined. Call structural variations in males were evident with changes in behavioural context, indicating parallel changes in the emotive state of sender. For a call to be used in vocal recognition it must display stereotypy within callers and variation between them. In Australian fur seal females and pups, individuals were found to have unique calls. Mutual mother-pup recognition has been suggested for otariids and this study supports the potential for this process to occur through the use of vocalisations. Call structural changes in pup vocalisations were also investigated over the progression of the year, from birth to weaning. Vocalisations produced by pups increased in duration, lowered in both the number of parts per call and the harmonic band containing the maximum frequency as they became older, suggesting calls are changing constantly as pups grow toward maturity. It has been suggested through descriptive reports, that the bark call produced by males is important to vocal recognition. The present study quantified this through the analysis of vocalisations produced by male Australian fur seals. Results support descriptive evidence suggesting that male barks can be used to discriminate callers. Traditional playback studies further confirmed that territorial male Australian fur seals respond significantly more to the calls of strangers than to those of neighbours, supporting male vocal recognition. This study modified call features of the bark to determine the importance to vocal recognition. The results indicate that the whole frequency spectrum was important to recognition. There was also an increase in response from males when they heard more bark units, indicating the importance of repetition by a caller. Recognition occurred when males heard between 25-75% of each bark unit, indicating that the whole duration of each bark unit is not necessary for recognition to occur. This may have particular advantages for communication in acoustically complex breeding environments, where parts of calls may be degraded by the environment. The present study examined the life history characteristics of otariids to determine the factors likely to influence and shape its vocal behaviour. Preliminary results indicate that female density, body size and the breeding environment all influence the vocal behaviour of otariids, while duration of lactation and the degree of polygyny do not appear to be influential. Understanding these interactions may help elucidate how vocal recognition and communication have evolved in different pinniped species.

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27

Otali, Dennis. "The combined effect of formalin fixation and individual steps in tissue processing on immunorecognition." Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2008r/otali.pdf.

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28

Wierucka, Kaja. "Multimodal mother-offspring recognition in the Australian sea lion, Neophoca cinerea." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS432.

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La reconnaissance joue un rôle important dans les systèmes de communication animale et plusieurs modalités sensorielles sont impliquées à cette fin. Bien que la reconnaissance mère-jeune ait été largement étudiée, il y a un manque d'information sur la reconnaissance multimodale et l'importance relative des différentes modalités dans ce processus. Dans cette thèse, j'ai exploré la communication multimodale chez un mammifère colonial - le lion de mer Australien (Neophoca cinerea). La reconnaissance mère-jeune est connue pour être multimodale chez cette espèce, mais les processus sous-jacents de la reconnaissance olfactive et visuelle, ainsi que les interactions entre les indices acoustiques, visuels et olfactifs, et leurs contributions relatives restent inconnues. Des analyses chimiques ont permis de déterminer si les profils chimiques diffèrent selon le sexe et l'âge, les colonies et les régions corporelles des animaux. La présence de similarités chimiques entre la mère et son petit suggèrent que l'appariement des phénotypes pourrait être utilisé pour la reconnaissance olfactive. J'ai examiné le rôle des indices visuels lors de la reconnaissance mère-jeune et j'ai constaté que les indices visuels spécifiques à l'âge sont utilisés par les femelles pour affiner la recherche de leur petit dans la colonie. Les jeunes ont également la capacité de distinguer divers indices visuels, qui peuvent être utilisés pour identifier les différentes classes de congénères. Enfin, j’ai pu aussi déterminer comment les indices acoustiques, olfactifs et visuels sont utilisés de manière synergique dans le processus d’identification individuel, et les résultats sont interprété dans une perspective coûts-avantages pour démêler les pressions évolutives sur chaque composante de ce système de communication. Si les différents indices sensoriels ont la capacité de transmettre des informations en isolation, leur rôle peut être différent lorsque d'autres indices sensoriels sont présents. Les résultats de cette recherche fournissent des résultats sans précédent, contribuant à une meilleure compréhension de la reconnaissance mère-jeune chez les mammifères, ainsi que des règles générales de communication chez les vertébrés
Recognition plays an important role in animal communication systems and individuals often employ different sensory modalities to enact this activity. Although recognition has been widely investigated, especially for mother-offspring interactions, there is a dearth of information about multimodal recognition and the relative importance and interactions of various sensory cues. In this thesis, I explored multimodal communication in a colonial mammal – the Australian sea lion (Neophoca cinerea). Communication during mother-pup reunions is known to be multimodal in this species, yet the underlying processes of olfactory and visual recognition, as well as the interactions between acoustic, visual and olfactory cues remain unclear. Through chemical analyses, I determined whether chemical profiles differ among sex and age classes, colonies, and body regions of animals. Chemical similarities between mothers and pups indicate that phenotype matching may be used by Australian sea lions for olfactory recognition. I examined the role of visual cues in mother-pup recognition and found that age-specific visual cues assist mothers to refine their search for their offspring in the colony. Pups are capable of distinguishing various visual cues that can be used in the assessment of conspecifics. Having provided baseline information about the role of sensory cues in isolation, I determined how acoustic, olfactory, and visual cues are used in a synergistic way to ensure accurate mutual recognition and then interpreted the results using a cost-benefit perspective to disentangle the evolutionary pressures on each component of this communication system. I showed that although cues have the ability to convey given information in isolation, their role may be different when other sensory cues are present. Furthermore, there is a mutual dependency in the communication system, where the limitations imposed on one participant of the dyad affect cue use by the other. These findings contribute to a better understanding of mammal mother-offspring recognition and communication mechanisms in vertebrates

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29

Sun, Lin. "Enabling pervasive applications by understanding individual and community behaviors." Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00814604.

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The digital footprints collected from the prevailing sensing systems provide novel ways to perceive an individual's behaviors. Furthermore, large collections of digital footprints from communities bring novel understandings of human behaviors from the community perspective (community behaviors), such as investigating their characteristics and learning the hidden human intelligence. The perception of human behaviors from the sensing digital footprints enables novel applications for the sensing systems. Bases on the digital footprints collected with accelerometer-embedded mobile phones and GPS equipped taxis, in this dissertation we present our work in recognizing individual behaviors, capturing community behaviors and demonstrating the novel services enabled. With the GPS footprints of a taxi, we summarize the individual anomalous passenger delivery behaviors and improve the recognition efficiency of the existing method iBOAT by introducing an inverted index mechanism. Besides, based on the observations in real life, we propose a method to detect the work-shifting events of an individual taxi. With real-life large-scale GPS traces of thousands of taxis, we investigate the anomalous passenger delivery behaviors and work shifting behaviors from the community perspective and exploit taxi serving strategies. We find that most anomaly behaviors are intentional detours and high detour inclination won't make taxis the top players. And the spatial-temporal distribution of work shifting events in the taxi community reveals their influences. While exploiting taxi serving strategies, we propose a novel method to find the initial intentions in passenger finding. Furthermore, we present a smart taxi system as an example to demonstrate the novel applications that are enabled by the perceived individual and community behaviors

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30

Clausen, Sally. "I never forget a face! : memory for faces and individual differences in spatial ability and gender." Honors in the Major Thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1394.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.
Bachelors
Sciences
Psychology

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31

Nelson, Elizabeth. "Investigating the Associations between Performance Outcomes on Tasks Indexing Featural, Configural and Holistic Face Processing and Their Correlations with Face Recognition Ability." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37917.

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Many important questions remain unanswered regarding how we recognize faces. Methodological inconsistencies have contributed to confusion regarding these questions, especially those surrounding three purported face processing mechanisms—featural, configural, and holistic—and the extent to which each play a role in face recognition. The work presented here aims to 1) empirically test the assumption that several face recognition tasks index the same underlying construct(s), and 2) contribute data to a number of ongoing debates concerning the reliability and validity of various methods for assessing integrative (i.e., holistic and/or configural) aspects of face processing. Experiment 1 tested the assumption that various tasks purporting to measure integrative face processing index the same construct(s). It is important to test this assumption because if these tasks are in fact measuring different things, then researchers should cease interpreting them as interchangeable measures. Using a within-subjects design (N = 223) we compared performance—as reflected by accuracy and reaction time measures, as well as two types of difference scores—across four of the most commonly used integrative face processing tasks: The Partial Composite Face Effect Task, the Face Inversion Effect Task, the Part Whole Effect Task, and the Configural/Featural Difference Detection Task. Analyses showed that within-task correlations were much stronger than those between-tasks. This suggests that the four conditions within each task are measuring something in common; In contrast, low correlations across tasks suggest that each is measuring something unique. This in turn suggests these tasks should not be seen as assessing the same integrative face-processing construct. Exploratory factor analyses corroborated the correlation data, finding that performance on most conditions loaded onto a single factor in unrotated solutions, but onto separate factors in direct oblimin-rotated solutions. In Experiment 2, we investigated the question of whether integrative face processing performance is related to face recognition ability. We did this by assessing the degree to which results from four widely-used integrative face processing tasks correlate with a measure of general face recognition ability, The Cambridge Face Memory Test (CFMT). The four integrative processing tasks used in this study only partly overlapped those from in Experiment 1. They were: The Complete Composite Face Effect Task, the Partial Composite Face Effect Task, the Part Whole Effect Task, and the Configural/Featural Difference Detection Task. As with Experiment 1, we used a within-subjects design (N = 260) and analyzed a variety of performance variables across these tasks. Analyses demonstrated low to moderate positive correlations between performance on the task conditions and performance on the CFMT. This suggests that the constructs the tasks reflect do contribute to face recognition ability to a modest degree. These analyses also replicated parts of Experiment 1, showing weak correlations between tasks. Also similar to Experiment 1, factor analyses generally revealed task conditions loading onto a common first factor in the unrotated factor matrix, but loading separately in the rotated factor solution. In addition to providing evidence regarding the nature of integrative face processing tasks, the data presented here speak to a number of other questions in this domain. For instance, they contribute to the debate regarding which kinds of difference scores (subtraction-based or regression-based) are more reliable, as well as the reliability of the various tasks used to investigate integrative face processing. In addition, the data inform the debate over whether the Complete or the Partial version of the Composite Face Effect Task is the superior measure of integrative face processing. In summary, the studies presented here indicate that the previous literature in face recognition needs to be interpreted with care, with an eye to differences in methodology and the problems of low measurement reliability. The various methods used to investigate integrative face processing are not assessing the same thing and cannot be taken as reflecting the same underlying construct.

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Woods, Richard David. "Collective responses to acoustic threat information in jackdaws." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/25978.

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Navigating the physical world may present only a small fraction of the challenges faced by social animals. Sociality brings with it numerous benefits, including access to important information that may have otherwise been harder to come by. However, almost every aspect of these apparent benefits may also entail additional cognitive challenges, including how to interpret signals from conspecifics, who to attend to, and how to incorporate knowledge about signallers when deciding how to respond. One approach to understanding the cognitive abilities associated with social function is to investigate social species that take part in potentially costly group behaviours, where individual decisions must be made in a social context. In this thesis I explore how jackdaws (Corvus monedula), a highly sociable corvid species, use acoustic information to coordinate collective anti-predator responses. In Chapter Two I showed using playback experiments that the magnitude of collective responses to anti-predator recruitment calls known as “scolding” calls depends on the identity of the caller, with larger responses to familiar colony members than unfamiliar individuals. In Chapter Three I then used habituation-dishabituation experiments to show that this vocal discrimination operates at the level of the individual, with jackdaws discriminating between the calls of different conspecifics, regardless of their level of familiarity. In Chapter Four, I examined whether aspects of call structure conveyed information about threat levels. Here, I found that high rates of scolding calls were associated with elevated threats, and playback experiments suggested that this information might result in larger group responses. The finding that jackdaws are capable of mediating their response to alarm calls based on the identity of the individual caller, and on structural variation in call production, raised the question of whether jackdaws employed similar forms discrimination between acoustic cues made by predators in their environment. I investigated this in Chapter Five, using playback experiments to show that jackdaws responded not only to the vocalisations of resident predators, but that this ability extended to novel predators, and that responsiveness was mediated by the phase of the breeding season in which predators were heard. Together, these findings provide insights in to how discrimination among acoustic cues can mediate group behaviour in species that respond collectively to threats.

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Yusko, Brittany. "Effects of Increased Levels of Prenatal Mesotocin on Postnatal Individual Recognition and Stress Responsiveness in Northern bobwhite quail (Colinus Virginianus)." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1217.

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Oxytocin (OT) plays a key role in the mediation of social and stress behaviors across many species; however, the mechanism is still unclear. The present study investigated the influence of prenatal levels of mesotocin (MT; avian homologue of OT) on postnatal social and stress behavior in Northern bobwhite quail. Experiment one determined endogenous levels of MT during prenatal development using an enzyme-linked immunoassay kit. Experiment two examined the influence of increased MT during prenatal development on chicks' individual recognition ability and stress response to a novel environment. Experiment one showed MT levels increased significantly throughout embryonic development. Experiment two showed significant differences in stress behavior for chicks with increased MT during prenatal development; however, no significant differences were found for social behavior. This study suggests MT serves different functions depending on the stage of embryonic development and that increasing MT levels affects postnatal stress behavior, but not social behavior.

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Matsumoto, Élia Yathie. "A methodology for improving computed individual regressions predictions." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-12052016-140407/.

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This research proposes a methodology to improve computed individual prediction values provided by an existing regression model without having to change either its parameters or its architecture. In other words, we are interested in achieving more accurate results by adjusting the calculated regression prediction values, without modifying or rebuilding the original regression model. Our proposition is to adjust the regression prediction values using individual reliability estimates that indicate if a single regression prediction is likely to produce an error considered critical by the user of the regression. The proposed method was tested in three sets of experiments using three different types of data. The first set of experiments worked with synthetically produced data, the second with cross sectional data from the public data source UCI Machine Learning Repository and the third with time series data from ISO-NE (Independent System Operator in New England). The experiments with synthetic data were performed to verify how the method behaves in controlled situations. In this case, the outcomes of the experiments produced superior results with respect to predictions improvement for artificially produced cleaner datasets with progressive worsening with the addition of increased random elements. The experiments with real data extracted from UCI and ISO-NE were done to investigate the applicability of the methodology in the real world. The proposed method was able to improve regression prediction values by about 95% of the experiments with real data.
Esta pesquisa propõe uma metodologia para melhorar previsões calculadas por um modelo de regressão, sem a necessidade de modificar seus parâmetros ou sua arquitetura. Em outras palavras, o objetivo é obter melhores resultados por meio de ajustes nos valores computados pela regressão, sem alterar ou reconstruir o modelo de previsão original. A proposta é ajustar os valores previstos pela regressão por meio do uso de estimadores de confiabilidade individuais capazes de indicar se um determinado valor estimado é propenso a produzir um erro considerado crítico pelo usuário da regressão. O método proposto foi testado em três conjuntos de experimentos utilizando três tipos de dados diferentes. O primeiro conjunto de experimentos trabalhou com dados produzidos artificialmente, o segundo, com dados transversais extraídos no repositório público de dados UCI Machine Learning Repository, e o terceiro, com dados do tipo séries de tempos extraídos do ISO-NE (Independent System Operator in New England). Os experimentos com dados artificiais foram executados para verificar o comportamento do método em situações controladas. Nesse caso, os experimentos alcançaram melhores resultados para dados limpos artificialmente produzidos e evidenciaram progressiva piora com a adição de elementos aleatórios. Os experimentos com dados reais extraído das bases de dados UCI e ISO-NE foram realizados para investigar a aplicabilidade da metodologia no mundo real. O método proposto foi capaz de melhorar os valores previstos por regressões em cerca de 95% dos experimentos realizados com dados reais.

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Dodenhoff, Danielle J. "AN ANALYSIS OF ACOUSTIC COMMUNICATION WITHIN THE SOCIAL SYSTEM OF DOWNY WOODPECKERS (PICOIDES PUBESCENS)." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1032381559.

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Abraham, Ashley N. "Word Recognition in High and Low Skill Spellers: Context effects on Lexical Ambiguity Resolution." Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1493035902158255.

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Silva, AntÃnio CÃsar Ferreira da. "IndivÃduo e RepÃblica em Jean-Jacques Rousseau: realizaÃÃo e reconhecimento." Universidade Federal do CearÃ, 2017. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=19868.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior
O presente trabalho procura destacar o olhar de Rousseau a respeito do indivÃduo moderno. No entanto, para muitos leitores e estudiosos de Rousseau, esta questÃo nÃo temnenhum destaque nas obras do pensador genebrino. Ã uma questÃo que nÃo interessa Ã filosofia roussseauniana, e, a prova disto, Ã que boa parte dos intÃrpretes apontam que o centro desta filosofia gira em torno da importÃncia da vida republicana. Aqui, o contrÃrio Ã o que vigora. Admite-se que a grande questÃo que envolve o pensamento rousseauniano se dÃ em torno dos problemas enfrentados pelos indivÃduos, que sÃo decorrentes da evoluÃÃo da sociedade moderna. A sociedade moderna propiciou o desenvolvimento e o progresso das ciÃncias. Este contexto para Rousseau fez com que os problemas dos indivÃduos se agravassem, ao invÃs de serem solucionados. As estruturas da sociedade moderna levaram os indivÃduos a terem bloqueadas a sua possibilidade de realizaÃÃo; algo que Rousseau tenta sanar em sua reflexÃo sobre o mundo moderno, sobre os indivÃduos. Na sua concepÃÃo, a chave para a formulaÃÃo de respostas aos problemas do indivÃduo moderno se encontram na possibilidade de reconhecimento do indivÃduo, como uma forma de realizaÃÃo. Ã medida em que o indivÃduo Ã reconhecido, hÃ a possibilidade de realizaÃÃo deste mesmo indivÃduo. A realizaÃÃo como reconhecimento sÃ poderÃ ocorrer dentro de um contexto especÃfico, que para Rousseau Ã o contexto da repÃblica. Ã a repÃblica o espaÃo no qual o indivÃduo deve construir para que seja possÃvel a sua realizaÃÃo. Tal realizaÃÃo se efetiva na medida em que o indivÃduo tem preservada a sua constituiÃÃo mais profunda, que se sustenta com o sentimento de existÃnciaprimeiro, o amor-de-si. A possibilidade de realizaÃÃo enquanto reconhecimento sÃ se torna viÃvel para o indivÃduo na proporÃÃo em que ele tem garantida a sua plena constituiÃÃo. Enquanto indivÃduo, que Ã o agente da construÃÃo de uma repÃblica que o acolhe enquantocidadÃo e que tem em suas mÃos a possibilidade de ser um artÃfice da construÃÃo do pacto republicano. Desta forma, Rousseau se insere numa tradiÃÃo importante, que tem no indivÃduosua grande preocupaÃÃo.

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Brennand, David Alexander Arthur. "Individual differences in recognition times to random dot stereograms, complex diamond stereograms and amplitude judgements in ridge stereograms : the role of tonic accommodation stereograms." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392544.

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Michalkiewicz, Martha [Verfasser], and Rüdiger F. [Akademischer Betreuer] Pohl. "Assessing and Explaining Individual Differences within the Adaptive Toolbox Framework: New Methodological and Empirical Approaches to the Recognition Heuristic / Martha Michalkiewicz ; Betreuer: Rüdiger F. Pohl." Mannheim : Universitätsbibliothek Mannheim, 2016. http://d-nb.info/1117474526/34.

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Michalkiewicz, Martha Verfasser], and Rüdiger [Akademischer Betreuer] [Pohl. "Assessing and Explaining Individual Differences within the Adaptive Toolbox Framework: New Methodological and Empirical Approaches to the Recognition Heuristic / Martha Michalkiewicz ; Betreuer: Rüdiger F. Pohl." Mannheim : Universitätsbibliothek Mannheim, 2016. http://d-nb.info/1117474526/34.

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Valentin, Caroline. "La légitimité des artistes de cabaret." Thesis, Toulouse 2, 2011. http://www.theses.fr/2011TOU20019.

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L’ouvrage souhaite apporter des clarifications et des définitions à propos des artistes évoluant dans les cabarets toulousains. L’objectif est de détecter les « processus de légitimation » que ceux-ci mettent en oeuvre afin d’asseoir leur légitimité, sociale, culturelle, familiale, artistique, professionnelle. Couronnés d’une aura de mystère de par leur statut de travailleur, leur mode de vie, leur emploi du temps, leurs rites et codes, leur organisation en réseaux, leurs cercles sociaux et leurs carrières atypiques, le sens commun aurait tendance à les étiqueter de « particuliers », « différents », « bohêmes », etc. Ainsi, en partant de préjugés et de stéréotypes dominants, on peut se poser la question de la manière dont ces artistes de music-hall légitiment leurs activités, leur statut par rapport aux autres arts, mais surtout, comment réussissent-ils à exporter leur légitimité dans leurs autres sphères relationnelles. L’hypothèse étant que la légitimité des artistes de cabaret toulousains n’est pas acquise ni assurée en tous milieux.Il s’agit également d’évaluer la légitimité culturelle dans le domaine des arts de ce groupe d’artistes professionnels composant le spectacle vivant. En effet, quelle est donc leur place dans la hiérarchie des arts, au regard d’un milieu de l’art se révélant structuré par des conflits de valeurs ? En se basant, entre autre, sur le principe des variations intra-individuelles, le débat discutera de la « démocratie culturelle » et des hiérarchies de valeurs culturelles, révélant la légitimité des « arts du divertissement ».Une enquête ethnosociologique où le chercheur est impliqué sur le terrain, visant à rendre compte des préoccupations sociales, telles qu’elles sont vécues dans le quotidien
This work wants to bring definitions and clarifications about the artists working in the cabarets of Toulouse. In order to discern the “processes of legitimization” the artists struggle to assert their social, cultural, artistic, professional legitimacy.Due to the mystery which floats around these workers’ status, their way of life, their timetable, their rituals and codes, their organization in networks, their social circles and their atypical careers, people have a tendency to put the label of “particular”, “different”, “bohemian” on them. So, on the basis of the prejudices and on the predominant stereotypes, we can wonder how these artists of music-hall can justify their activities, their status in comparison with the order arts and especially how they succeed in exporting their legitimacy in other relational spheres. The hypothesis shows that the legitimacy of the artists of the cabaret in Toulouse is neither acquired nor assured in any circles.It is also a question of assessing the cultural legitimacy of this group among the other arts. These professional artists propose shows in live and we can wonder what place they have in the hierarchy of art, noticing that arts turned out to be structured by conflicts of values. Based on the principle of intra-individual variations, we can debate about “Cultural Democracy” and the hierarchies of cultural values, and so reveal the legitimacy of “the arts of entertainment”.This work is an ethnosociological survey, in which the researcher is involved in, and he denounces the social problems he experiences in his daily life

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Fox, Elizabeth J. S. "Call-independent identification in birds." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0218.

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[Truncated abstract] The identification of individual animals based on acoustic parameters is a non-invasive method of identifying individuals with considerable advantages over physical marking procedures. One requirement for an effective and practical method of acoustic individual identification is that it is call-independent, i.e. determining identity does not require a comparison of the same call or song type. This means that an individuals identity over time can be determined regardless of any changes to its vocal repertoire, and different individuals can be compared regardless of whether they share calls. Although several methods of acoustic identification currently exist, for example discriminant function analysis or spectrographic cross-correlation, none are call-independent. Call-independent identification has been developed for human speaker recognition, and this thesis aimed to: 1) determine if call-independent identification was possible in birds, using similar methods to those used for human speaker recognition, 2) examine the impact of noise in a recording on the identification accuracy and determine methods of removing the noise and increasing accuracy, 3) provide a comparison of features and classifiers to determine the best method of call-independent identification in birds, and 4) determine the practical limitations of call-independent identification in birds, with respect to increasing population size, changing vocal characteristics over time, using different call categories, and using the method in an open population. ... For classification, Gaussian mixture models and probabilistic neural networks resulted in higher accuracy, and were simpler to use, than multilayer perceptrons. Using the best methods of feature extraction and classification resulted in 86-95.5% identification accuracy for two passerine species, with all individuals correctly identified. A study of the limitations of the technique, in terms of population size, the category of call used, accuracy over time, and the effects of having an open population, found that acoustic identification using perceptual linear prediction and probabilistic neural networks can be used to successfully identify individuals in a population of at least 40 individuals, can be used successfully on call categories other than song, and can be used in open populations in which a new recording may belong to a previously unknown individual. However, identity was only able to be determined with accuracy for less than three months, limiting the current technique to short-term field studies. This thesis demonstrates the application of speaker recognition technology to enable call-independent identification in birds. Call-independence is a pre-requisite for the successful application of acoustic individual identification in many species, especially passerines, but has so far received little attention in the scientific literature. This thesis demonstrates that call-independent identification is possible in birds, as well as testing and finding methods to overcome the practical limitations of the methods, enabling their future use in biological studies, particularly for the conservation of threatened species.

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Vázquez, Martínez Silvina. "Identidad y Reconocimiento. Un estudio sobre los espacios públicos internos de la política." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/461410.

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El trabajo de investigación doctoral que aquí presentamos explora la problemática de la identidad personal y comunitaria a través de la categoría del reconocimiento. Nuestro objetivo principal consiste en repensar estos conceptos de forma tal que quede resguardada la pluralidad de significados que cada uno de ellos alberga, al tiempo que se intenta poner en valor tanto la hondura política del sí mismo como su estructura relacional. Ambos conceptos, identidad y reconocimiento, comportan algún tipo de lazo con la alteridad, con la noción de un otro que transforma la propia percepción del sí mismo (o self). Pero también cobijan un fondo de perplejidad y extrañeza relativo al mundo interno del ciudadano. Nuestra principal hipótesis es que esta interioridad del self es, en parte, un fenómeno de raigambre pública y política. Y esto requiere implementar una matriz teórica abierta a trascender las estructuras lógico-verbales del pensamiento con las que se suele abordar la problemática del reconocimiento identitario; empezando por el propio lenguaje de «lo objetivo» y «lo subjetivo», de la división a ultranza entro «lo público» y «lo privado», entre el «adentro» y el «afuera». Con el fin de acometer este examen conceptual, hemos desplegado una investigación exhaustiva de los conceptos de identidad y reconocimiento mediante la lectura de tres tipos distintos de fuentes téoricas: dialógicas, retóricas y psicoanalíticas. Mientras que la perspectiva dialógica (o dialéctica) absorbe los debates identitarios de las ciencias sociales tanto como permanece ceñida al sentido de la vista y al principio de identidad aristotélico; las fuentes retóricas permiten abordar el fenómeno de la identidad poniendo el acento en los aspectos contigentes de la imaginación (inventio), el juicio y la palabra. Una primera hipótesis de lectura nos llevó a conjeturar sobre la retórica cívica como una forma alternativa a la del discurso dialéctico. Una forma en la que late otro modo de pensar, de comunicar y de traspasar trozos de experiencia, más acorde con la fragilidad y contingencia humana. Así mismo, las lecturas psiconalíticas nos brindaron la oportunidad de incluir en la reflexión los sustratos no-conscientes de la identidad y las maneras en que éstos intervienen sobre el loable propósito del reconocimiento comunitario. De tener en cuenta estos aportes, conceptos como los de memoria, olvido (léthe) y voluntad ―todos ellos cruciales en los procesos de identificación y reconocimiento político― se ven notablemente afectados por comparación a la narrativa moderna del sujeto-soberano, de voluntad omnipotente y razón cartográfica. Nuestra investigación nos llevará a concluir que el ámbito donde se juega lo primordial de la identidad y del reconocimiento político no puede ser comprendido desde contornos definibles y coordenadas precisas. Se trataría más bien de espacios (tanto mentales y afectivos como vinculares) en donde los axiomas de no-contradicción y el principio de identidad aristotélico no rigen, lo que representa un inmenso desafío para consciencia lógico-temporal del individuo.
The doctoral investigation presented here explores the issue of personal and community identity through the category of recognition. Our main objective consists of rethinking these concepts in a way that guards the plurality of significance that each one shelters, at the same time seeking to evaluate as much the political depth of the self as its relational structure. Both concepts - identity and recognition - contain some kind of link with otherness, with the notion of other that transforms the individual’s perception of self. But these concepts also shelter a base of perplexity and strangeness relative to the internal world of the citizen. Our main hypothesis is that this interiority of self is, partly, a public and political phenomenon. This hypothesis requires implementing a theoretical matrix open to transcending the logical-verbal structures of thought with which the issue of identity recognition is usually addressed, starting with the lexicon of “objective” and “subjective”, the extreme division of “what is public” and “what is private”, between the “inside” and “outside”.

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Samsodien, Adeeb. "Entrepreneurial learning, opportunity recognition and development - Evaluating the impact of a training programme at TSiBA Education, Cape Town, South Africa." University of the Western Cape, 2017. http://hdl.handle.net/11394/6325.

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Magister Commercii - MCom (Business and Finance)
The youth of South Africa is currently faced with high levels of unemployment and poverty. This raises concerns about the future of the South African people and its economy. Consequently, much is needed to develop the youth to allow for a prosperous future. A decrease in poverty and unemployment was found to be linked to an increase in education. Entrepreneurial education can have a significant impact on entrepreneurial success. This research paper aims to assess the influence of entrepreneurial education and training on students' entrepreneurial development. To ensure a comprehensive assessment of the development of students, I utilised a mixed methodology to assess students both quantitatively and qualitatively. The study assessed a sample of students from South Africa and the United States of America who jointly partook in a two-week entrepreneurial education and training programme at TSiBA Education, Cape Town, South Africa. Entrepreneurial education and training had a positive effect on the students' entrepreneurial development, entrepreneurial orientation and intentions to start a business. While entrepreneurial orientation aids the exploitation of business opportunities, before opportunities can be exploited they must be recognised. Bringing into question the link between students' entrepreneurial orientation and their abilities to recognise and develop opportunities into successful ventures. To explore this I interviewed two participants and found the high entrepreneurially orientated participant to exhibit greater opportunity recognition and development abilities, compared to the low entrepreneurially orientated participant. I concluded by finding that although differences do exist between high and low entrepreneurially orientated students, entrepreneurial education and training could positively influence students' entrepreneurial orientation and assist in the development of entrepreneurs. The results suggest that TSiBA Education should attempt to increase the duration of the entrepreneurial programme to maximize the influence of the entrepreneurial education and training.

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Hughes-Scalise, Abigail T. "Exploring the Roles of Adolescent Emotion Regulation, Recognition, and Socialization in Severe Illness: A Comparison Between Anorexia Nervosa and Chronic Pain." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1401897218.

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Tessarolo, Geiziane. "Variação no canto de anúncio de Dendropsophus cruzi (Pombal & Bastos,1998) (Anura: Hylidae)." Universidade Federal de Goiás, 2010. http://repositorio.bc.ufg.br/tede/handle/tede/3723.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The advertisement call of anurans contains spectral and temporal information important for specific recognition, beside relevance in social organization and attraction of females. The variation in features call has been received attention because their importance in breeding behavior, and implications for the recognition of conespecifics in multiple levels of social organization. The objective of this study is to investigate patterns of variability in the acoustics properties of the advertisement call of Dendropsophus cruzi in different levels: individual, population and specific, in ten populations of state of Goiás. The following acoustic variables were analyzed: call repetition rate, duration of call, number of pulses, duration of pulse and dominant frequency. The acoustics parameters weret influenced as for temperature as for rostrumcloacal length (CRC), and presented different variability coefficients, within-male and among-male being the variability among-male greater than the variability within-male. The dominant frequency is the property of greater potential for use in the specific recognition and also is the characteristic that best discriminates populations. The geographic distance did not predict the differences found in the call. However, geographic cline patterns was found for duration of call, call repetition rate and CRC. The differences among populations can be due to local selective pressures as environmental and social structure of the chorus. The decreases of CRC to the north reflect the gradual change in the temperature in the same sense, influencing the development and growth rates, with smaller individuals. On the other hand, the increase of the temporal characters of call occur for increase the loss attractiveness caused by the high dominant frequency imposed by the smallest size of the body.
O canto de anúncio contém informações espectrais e temporais importantes para o reconhecimento específico, além de sua relevância na organização social e atração sexual de fêmeas. A variação nas características do canto tem recebido bastante atenção devido sua importância no comportamento de acasalamento e suas implicações para o reconhecimento de coespecíficos em múltiplos níveis de organização social. Assim o objetivo deste estudo é investigar padrões de variabilidade nos parâmetros acústicos do canto de anúncio de Dendropsophus cruzi em nível individual, populacional e específico, em dez populações do estado de Goiás. As seguintes variáveis acústicas foram analisadas: taxa de repetição, duração do canto, número de pulsos, duração do pulso e frequência dominante. Os parâmetros acústicos foram influenciados tanto pela temperatura como pelo comprimento rostro-cloacal (CRC), e apresentaram diferentes coeficientes de variação, sendo que o CVinter-individual foi maior que o CVintraindividual. A freqüência dominante é a propriedade de maior potencial para ser usada no reconhecimento específico e também é a característica que melhor discrimina as populações. A distância geográfica entre as populações não foi preditora para as diferenças encontradas no canto. Entretanto padrões geográficos clinais foram encontrados para duração do canto, freqüência dominante, taxa de repetição e CRC. As diferenças entre as populações podem ser devidas a pressões seletivas locais tanto ambientais como de estrutura social do coro. A diminuição do CRC ao norte reflete a mudança gradual de temperatura que ocorre nesse sentido, influenciando as taxas de desenvolvimento e crescimento, com indivíduos menores. Por outro lado o aumento das características temporais do canto ocorre para aumentar a atratividade perdida pelas altas freqüências dominantes impostas pelo menor tamanho do corpo.

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Orrell, Kimberly Sue. "Intersexual Communication, Male Mate Preference, and Reproductive Energetics of the Polygynous Lizard, Anolis Carolinensis." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/28366.

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Particularly lacking in the current body of sexual selection literature are studies based on reptile species and intrasexually selected mating systems. Because the life history traits and ecology of reptiles are dramatically different from other animal taxa, current models of sexual selection are insufficient for predicting how sexual selection should influence the behavior and mating systems of lizards. Similarly, intersexually selected mating systems (i.e., based on female choice) are inappropriate predictive models for examining species with intrasexually selected mating systems (i.e., based on consexual contests). I investigated three aspects of Anolis carolinensis behavior and mating system (communication signals, male mate preference, and reproductive energetics) to contribute to a theoretical model for sexual selection based on a lizard with an intrasexually selected, polygynous mating system. In my first study, I quantified the structure and use of signals exchanged by both sexes, compared signal structure and use during heterosexual interactions to that of other social contexts (e.g., male-alone, male-male, female-female), then related signal structure and use to the species mating system. During heterosexual interactions, both sexes performed three kinds of stereotypic headbob displays with equal precision that were essentially identical to those previously documented for other social contexts. Thus, there is no courtship-specific headbob display for A. carolinensis. However, male and female signal use was extremely dimorphic. For the purpose of indicating sexual identity, the sexually dimorphic patterns of signal use were excessively redundant, yet equivocal. Although the male pattern of signal use reliably conveys sexual identity, the female pattern of signal use conveys ambiguous sexual identity. Based on circumstantial evidence from other studies, I propose the hypothesis that the female pattern of signal use may permit female-sized, nonterritorial males to mimic female signals. Small males may be selected to use female mimicry to gain access to the territories of larger males and mating opportunities with resident females, while females may be indirectly selected to use a signaling pattern that provides them with an alternative mating option. From field and laboratory data on A. carolinensis signal behavior during other social contexts and the species' female-defense mating system, I evaluate proposed functions for heterosexual signaling from a perspective of intrasexual selection. In my second study, I tested the prediction that males should include a preference for mating with novel females (PNF) as part of their mating strategy. This prediction was supported by both laboratory and field manipulations. Compared to their encounters with resident females, males during laboratory encounters with novel females significantly increased their display rate, volley frequency, volley length, and significantly decreased the distance and number of movements traveled away from the female. My laboratory data also suggest that males discriminated novel females from resident females independently of female behavioral or chemical cues. Similarly, compared to their interactions with resident females, free-ranging males responded to introduced novel females by significantly increasing the proportion of time spent in female-directed activities and the proportion of displays directed toward novel females, and significantly decreasing the proportion of time spent in territorial activities and the proportion of displays used in territorial activities. Data from both experiments indicate that males appear to distinguish among individual females, and use this ability to increase reproductive success by identifying and preferentially pursuing novel females over previously inseminated resident females. I suggest that males are able to cognitively identify individual resident females, and use this ability to control mating decisions within their territories. In my third study, I examined the energy expenditure of males and females during breeding and postbreeding seasons. I used laboratory respirometry to determine resting metabolic rates, and the doubly-labeled water technique to determine field metabolic rates in free-ranging lizards. Resting metabolic rates were significantly influenced by body mass and season, but not sex. Field metabolic rates were significantly influenced by body mass, but not sex or season. I attributed the ~40% seasonal increase in resting metabolic rates to a seasonal increase in feeding rates and the effect of specific dynamic action. Resting and field metabolic rates were used to calculate energy budgets for each sex during breeding and postbreeding seasons, and to calculate the energy expended by each sex for reproduction. Despite having 40% smaller body mass, females expended 46% more energy for reproduction than males, and a similar amount of total maintenance energy as males. The total maintenance energy of males was similar during both seasons, however that of females decreased 44% from breeding to postbreeding season. I found both seasonal and sexual differences in the amount of energy lizards allocated to resting and activity. Anolis carolinensis had field metabolic rates that were similar to tropical and temperate species of lizards, and higher than lizards from arid/semiarid environments. Anolis carolinensis also expended more energy on eggs, and more total energy during the breeding season, than lizards from arid/semiarid habitats.
Ph. D.

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Hale, Jennifer Ann. "The Role of Male Vocal Signals During Male-Male Competition and Female Mate Choice in Greater Prairie-Chickens (Tympanuchus cupido)." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365786099.

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Trilha, Schappo Kellen. "Les angles morts d'un monde juridiquement hétérogène : essai sur l'exercice stratégique de la volonté en droit international privé contemporain." Thesis, Paris, Institut d'études politiques, 2016. http://www.theses.fr/2016IEPP0071/document.

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Est-il possible ou même souhaitable d’empêcher qu’un justiciable choisisse un cadre juridique le plus favorable possible à ses intérêts ? Le droit encadre et limite la volonté individuelle dans des domaines où des intérêts collectifs doivent primer ; l’internationalité d’un rapport relativise, toutefois, ces limites, et ouvre aux justiciables une multitude de possibilités pour le développement d’un cadre juridique sur mesure. Le droit international privé répond aux difficultés propres à l’internationalité du rapport, mais la complexité de certaines situations défie les limites des mécanismes mis à disposition par cette discipline. En effet, le contrôle du choix individuel est rendu plus difficile par l’exploitation, par les acteurs privés, non seulement du contenu variable des règles applicables à un certain rapport, mais des corps de règles accessoires au rapport principal, dans un monde juridiquement hétérogène. L’exercice stratégique de la volonté consiste dans la manipulation du cadre juridique par un justiciable en vue d’écarter l’application d’une loi moins favorable à ses intérêts que celle qu’il est en mesure de lui substituer. En soumettant sa situation à un cadre juridique de son choix, le justiciable l’écarte du champ de vision de l’ordre juridique de départ, qui ne reverra la situation qu’au moment de décider sur ses effets. La nouvelle solution développée par le justiciable risque également de n’avoir pas été anticipée et réglementée par l’ordre juridique d’accueil, ou par un quelconque ordre juridique appelé à émettre une décision en rapport avec la situation. Les intérêts en présence ne sont ainsi pas complètement considérés et mis en balance. Comme un espace qui échappe à la vision d’un observateur, certains aspects de la situation se trouveront donc dans un angle mort, phénomène que cette thèse aura pour objectif de décrire pour ensuite envisager le traitement
It is practically impossible to prevent individuals from choosing the legal framework that would best fit their expectations. Law regulates and limits individual will in contexts in which collective interests, as it understands them, should prevail; the international aspect of a situation relativizes, however, these limits, and offers multiple possibilities for individuals to develop a tailor-made framework for their own relationship. Private international law addresses the difficulties arising from the international aspects of a situation, but the complexity of some cases challenges the limits of the discipline’s mechanisms. Controlling the effects of individual choices becomes more difficult when not only the different content of rules from a country to another is explored, but individual strategy extends also to neighbouring regimes, in a normatively heterogeneous world. The strategic exercise of will consists in the manipulation of the regulatory framework by an individual aiming at excluding the application of a norm which does not satisfy their purpose. The submission of the situation to a chosen legal framework diverts it from the field of vision of the initial legal order, which will not see the situation again unless it is called to decide upon its effects. The new solution developed by the individual risks being not fully anticipated and regulated by the receiving legal order, or by any legal order that will have to decide on matters related to the main situation. Thus, in these conditions, the different interests at stake are not fully considered and balanced. As a space that escapes from an observer’s eyesight, some aspects of the situations are in a blind spot, phenomenon whose description and treatment are at the centre of this thesis

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Avancini, Tiffany Moukbel Chaim. "Acurácia diagnóstica em sujeitos adultos com TDAH e transtorno bipolar: classificação individual de imagens de ressonância magnética de crânio." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5142/tde-06062017-103414/.

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INTRODUÇÃO: O transtorno de déficit de atenção com hiperatividade (TDAH) persistente em adultos apresenta prevalência significativa na população geral. Nota-se também uma alta taxa de comorbidade com outros quadros psiquiátricos, especialmente o transtorno bipolar (TB). Entretanto, ainda hoje discutem-se as próprias definições do TDAH e os limites da comorbidade TDAH+TB, que poderia ser uma extensão dos sintomas do espectro bipolar, uma sobreposição dos dois transtornos ou uma entidade separada com substrato neurobiológico distinto. Impõe-se, assim, a pesquisa de biomarcadores válidos com potencial aplicação na prática clínica. O surgimento recente de técnicas de classificação de padrões morfológicos cerebrais complexos possibilita uma investigação mais direcionada de biomarcadores, buscando em cada indivíduo um conjunto de características que seja capaz de classificá-lo como pertencente a um determinado grupo. OBJETIVOS: Aplicar, de maneira inédita, a técnica de reconhecimento automatizado de padrão aos dados de neuroimagem de pacientes adultos sem tratamento prévio com diagnóstico de TDAH com início na infância, TB, TDAH+TB e controles saudáveis (CS), em busca de assinaturas neuroanatômicas associadas a estes transtornos. MÉTODOS: Três grupos de adultos nunca tratados compostos de 67 sujeitos com TDAH, 30 sujeitos com TB e 16 sujeitos preenchendo critérios diagnósticos para ambos os transtornos; e uma amostra de CS (n=66), foram submetidos ao exame de ressonância magnética (RM) estrutural e de imagem por tensor de difusão (diffusion tensor imaging; DTI). Através de um método automatizado, regiões de interesse foram posicionadas ao longo de todo o cérebro e através destas foram obtidas medidas cerebrais a partir das imagens multimodais. Tais medidas foram usadas como dados de entrada para um classificador não-linear baseado em support vector machine (SVM). Comparações entre todos os pacientes e CS foram feitas através de subgrupos pareados individualmente para gênero e idade e pareados entre os grupos para nível socioeconômico e escolaridade. As medidas de desempenho diagnóstico foram analisadas com o auxílio de curvas receiver operating characteristic (ROC). RESULTADOS: As análises de classificação entre todos os subgrupos apresentaram resultados expressivamente acima do acaso, com exceção da comparação entre os pacientes com TB e os CS (p=0,09). A comparação entre os subgrupos com TDAH e CS apresentou medidas de área sob a curva (AUC) e acurácia diagnóstica de até 0,71 e 66,2% (p=0,003). A comparação entre os subgrupos com TDAH e TB obteve AUC e acurácia diagnóstica de até 0,78 e 70,2% (p=0,01). As análises de classificação entre os pacientes TDAH+TB e todos os outros subgrupos resultaram em valores de até 0,89 e 80,5% (p=0,0009) de AUC e acurácia diagnóstica respectivamente. CONCLUSÃO: Os resultados fornecem endosso neurobiológico para a validade do diagnóstico clinico de TDAH em adultos. As características cerebrais mostraram-se suficientemente fortes para o diagnóstico diferencial entre o TDAH e o TB e também reforçam a hipótese de que a associação TDAH+TB deve ser compreendida como uma entidade neurobiológica distinta. Restam ainda relevantes dificuldades na busca de biomarcadores para a caracterização do TB. As assinaturas neuroanatômicas identificadas neste estudo podem fornecer informações objetivas adicionais e valiosas, servindo como base para estudos futuros que avaliem sua possível influência em decisões terapêuticas dos pacientes apresentando sintomas do espectro TDAH e da comorbidade TDAH+TB
INTRODUCTION: Attention-deficit/hyperactivity disorder (ADHD) is a highly prevalent condition in the general adult population. Also important is its high rate of comorbidity with other psychiatric disorders, particularly bipolar disorder (BD). However, not only the definition of ADHD is still a matter of discussion but also the limits of the ADHD+BD comorbidity; such comorbidity may be interpreted as a continuum spectrum of BD, an overlap of symptoms, or a separate diagnostic entity with a distinct neurobiological substrate. Therefore, further search for valid biomarkers with potential application in clinical practice is still required. The recent development of high-dimensional pattern recognition techniques has allowed targeted investigations of biomarkers, searching for sets of characteristics that could be used to classify each patient in a particular group. OBECTIVES: To apply, for the first time in the literature, machine learning-based pattern recognition methods to neuroimaging data obtained in never-treated adults with childhood-onset ADHD, BD, ADHD+BD and healthy controls (HC), searching for different neuroanatomical signatures associated with each disorder. METHODS: Three groups of never treated adults as following: 67 ADHD patients, 30 BD patients, 16 patients fulfilling diagnostic criteria for both disorders; and a sample of HC (n=66) underwent structural magnetic resonance imaging (MRI) and diffusion magnetic resonance imaging (DTI) acquisitions. A support vector machine (SVM) classifier with non-linear kernel was applied on multi-modal image features extracted on regions-of-interest placed across the whole brain. Comparisons among all patients and controls were carried out through subgroups individually matched for gender and age, and group-matched for years of education and socio-economic status. Diagnostic performance measures were evaluated by computing receiver operating characteristic (ROC) curves. RESULTS: All results on classification analyses were clearly significant above chance level, except in the comparison analysis between BD patients and HC (p=0.09). The comparison between ADHD and HC subgroups afforded area under the curve (AUC) measures and diagnostic accuracy of up to 0.71 and 66.2% (p=0.003). Comparison between ADHD and BD subgroups achieved AUC and diagnostic accuracy of up to 0.78 and 70.2% (p=0.01). Classification analysis between ADHD+BD patients and the other subgroups yielded AUC and diagnostic accuracy values of up to 0.89 and 80.5% (p=0.0009). CONCLUSION: The present study provides neurobiological endorsement to the validity of the clinically-based diagnosis of ADHD in adults. Brain features were strong enough to the differential diagnosis between ADHD and BD, as well as to reinforce the hypothesis that ADHD+BD may represent a distinct neurobiological entity. However, relevant challenges persist regarding the search for biomarkers for BD. The neuroanatomical signatures identified herein may provide additional, objective information, paving the way for future studies assessing its influence in treatment decisions in adults with ADHD and ADHD+BD spectrum symptoms

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Dissertations / Theses on the topic 'Individual recognition'

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