Literatura académica sobre el tema "Gaze Pattern"

Perceiving the direction of another's attention is a critical component of normal social behaviour. Seminal electrophysiology studies demonstrated that single cells in macaque superior temporal sulcus (STS) are tuned to specific directions of social cues, including gaze direction, head view, and body posture. Furthermore, a subset of such neurons respond to a single direction across multiple cues, suggesting that the code is driven by the direction of another's social attention regardless of how this is conveyed. Attempts to reveal similar gaze representations in humans using fMRI have provided mixed results. This thesis describes research where multivariate pattern analysis (MVPA) methods are applied to fMRI data in order to better explain how the human brain and particularly STS codes perceived gaze direction. After describing the MVPA methods applied in this thesis, I first demonstrate that fMRI response patterns in anterior STS distinguish between the direction of dynamic head turns, but not between the direction of rotation in non-social ellipsoids. In subsequent work, anterior STS is found to code the direction of another's gaze in a head view-invariant manner, thus demonstrating a potential parallel to previous macaque evidence for single cells that code the direction of another's attention. However, comparisons that run both across species (macaque, human) and methods (electrophysiology, fMRI) are problematic. To overcome this limitation I next tested whether macaque STS distinguishes gaze direction and head view when responses are measured with fMRI. In conclusion, this thesis demonstrates the utility of applying MVPA to fMRI data to reveal socially-relevant representations of the direction of another's attention. The thesis particularly highlights anterior STS as a key region in supporting direction-specific representations of social cues. These results advance our understanding of how the brain codes socially-relevant information, and highlight possible similarities and dissimilarities between humans and macaques.

Lack of eye contact is one of the key clinical observations in schizophrenia. Sixteen schizophrenic patients and sixteen control subjects participated in our study of eye gazing. Frequencies of eye contact of both groups were measured in a role-play test which is closer to a natural environment. Autistic traits of both groups were measured using the Autism Quotient Questionnaire. We hypothesized that patients’ frequencies of eye contact were fewer than control subjects. We anticipated that patient group would score high in AQ. Furthermore, we examined the relationship between frequency of eye contact and cognitive functioning and symptomatology. Lastly, the study also examined the relationship between frequency of eye contact and autistic traits. Result showed that patients’ eye contact were significantly fewer than control group. Patients’ overall cognitive functioning was not as good as control group. In addition, schizophrenic patients scored significantly higher than control group in the Autism Quotient Questionnaire; autistic traits were found in schizophrenia patients. There was no relationship between frequency of eye contact and cognitive functioning. Nonetheless, negative correlation was found between frequency of eye contact and Digital symbol. More eye contact was associated with lower Digital symbol score. No relationship was found between frequency of eye contact and Autism quotient. Lastly, a trend correlation was found between frequency of eye contact and PANSS negative score; more eye contact was associated with higher PANSS negative score.<br>published_or_final_version<br>Psychological Medicine<br>Master<br>Master of Psychological Medicine

Dyslexia affects between 5-17% of all school children, mak-ing it the most common learning disability. It has beenfound to severely affect learning ability in school subjectsas well as limit the choice of further education and occupa-tion. Since research has shown that early intervention andsupport can mitigate the negative effects of dyslexia, it iscrucial that the diagnosis of dyslexia is easily available andaimed at the right children. To make sure children whoare experiencing problems reading and potentially could bedyslectic are investigated for dyslexia an easy access, sys-tematic, and unbiased screening method would be helpful.This thesis therefore investigates the use of machine learn-ing methods to analyze eye movement patterns for dyslexiaclassification.The results showed that it was possible to separatedyslectic from non-dyslectic readers to 83% accuracy, us-ing non-sequential feature based machine learning methods.Equally good results for lower sample frequencies indicatedthat consumer grade eye trackers can be used for the pur-pose. Furthermore a sequential approach using RecurrentNeural Networks was also investigated, reaching an accu-racy of 78%. The thesis is intended to be an introduction to whatmethods could be viable for identifying dyslexia and as aninspiration for researchers aiming to do larger studies in thearea.

Emerging research suggests that many adults with Autism Spectrum Disorder (ASD) experience impairing Social Anxiety Disorder (SAD) or social anxiety symptoms (e.g., Joshi et al., 2013; Kleinhans et al., 2010), yet there is little guidance or agreement about how to best assess social anxiety in this population. Direct examination of overt eye gaze patterns may help determine if the attentional biases often reported in people with SAD also operate in those with ASD and co-occurring social anxiety. This study sought to assess the influence of social anxiety on gaze patterns in adults with ASD. An exploratory aim was to better understand the phenomenology of SAD within ASD. Three groups of participants were included: adults with ASD (n = 25), adults with SAD (n = 25), and adults without ASD or SAD (n = 25). As hypothesized, a large subset (n = 11; 44%) of the participants with ASD met diagnostic criteria for SAD. Contrary to study hypotheses related to gaze patterns, however, there was no evidence for gaze vigilance followed by avoidance for socially threatening stimuli in either the ASD or SAD groups, and there was no relationship between fear of negative evaluation and gaze duration toward socially threatening stimuli within the ASD group. Possible reasons for these null findings are considered. Clinical implications and suggestions for future research are also discussed.<br>Ph. D.

It has been hypothesized that head-unrestrained gaze shifts are controlled by an error signal produced by a feedback loop. It has also been hypothesized that the superior colliculus (SC) is within this feedback loop. If the feedback-to-SC hypothesis is valid, an unexpected mid-flight perturbation in gaze trajectory should be quickly followed by a concurrent change in the discharges of collicular saccade-related neurons. To verify this prediction experimentally, primate head movements were unexpectedly and briefly halted during head-unrestrained gaze shifts in the dark. Perturbed gaze shifts were composed of first a gaze saccade made when the head was immobilized by the head-brake, followed by a period where gaze was immobile, called a gaze plateau. The latter was composed of an initial period when the eyes and head were immobile, followed by a period wherein the head was released and the eyes counter-rotated to stabilize gaze. The plateau ended with a corrective gaze saccade to the goal location. In perturbed gaze shifts, there was widely distributed activity on the SC map during gaze plateaus, and there was no evidence that the initial motor program was aborted; the corrective gaze saccades were not "fresh" small stand-alone movements. Cells on the SC map responded at short latencies to head accelerations and associated gaze shift perturbations and carried a gaze position error (GPE = final - instantaneous gaze position) signal. As a large gaze shift progressed there was a caudo-rostral moving hill of activity on the SC map that encoded, not instantaneous veridical GPE, but a filtered version of it (time constant 100ms). Recordings from both the motor map and the so-called "fixation zone" in the rostral SC during perturbed head-unrestrained gaze shifts reveal gaze feedback control and a gaze feedback signal to the SC. However, these results do not prove that the SC is within the online gaze feedback loop, only that such a loop exists and that the collicular map is informed about its calculations.

The following master thesis is the product of the work carried out during the Erasmus exchange of the year 2017-2018 that involved the author, exchange student from the University of Bologna, the Universitat Politècnica de Catalunya , TriM, an italian company with a strong knowledge of weather data and forecasting, and Meteocat, the public meteorological company of Catalonia in a collaboration aimed to find new methodologies for the processing of meteorological data. The reason that motivated this work is dictated by the increasing amount of weather data available today, that necessarily drives the weather forecasting in a more automated procedure that reduces the time needed to generate a forecast and the intervention of a human, in the figure of a meteorologist, in the analysis of the data. This allows to process more data and thus having predictions that take advantages of the usage of many information that could result in improved forecasting. The development in the field of machine learning allows today to treat a vast amount of information in an automatic way, leaving the analysis process to the machines, freeing the user of this time-consuming task. And unsupervised learning is the branch that can process data that are not labelled nor preprocessed, speeding up the data mining. The goal of this thesis is to apply unsupervised learning techniques to this scope, taking inspiration from the available literature that experimented in this field and combining different solutions into a new technique that aims to reduce the human decision in the process of the recognition of wind patterns and improve the automationof the whole process.

Mobile apps have emerged ever since the smartphone has been establishedinto most peoples everyday life. Almost half of those available apps in the appstores are mobile games. We study game design patterns speci cally for endlessmobile minigames, as they are one of the emerging categories. This genre hasbecome popular in the app stores with its unique characteristics which include veryshort play session iterations and its minimalist design. Game design patterns arefocused on the interaction with the player and provide knowledge and experiencewith regards to games in general. Not only are they bene cial for game designers,but also for developers, practitioners and possibly researchers, as patterns providea common terminology to share information between di erent professions.We conduct a case study including ve example games and analyze endlessmobile games to identify and create genre speci c game design patterns. We searchfor commonalities and major aspects of endless mobile minigames to facilitate theproduction of such games for developers. To con rm our results, we implementa prototype of an endless mobile minigame, which is then evaluated through asurvey.The result is a collection of game design patterns based on our cases. Thequestionnaire reveals which of those patterns are relevant and should be consideredwhen developing an endless mobile game. The result outlines that game designpatterns are considered supportive when designing a game, however requires ad-justments and revisions.