Relevant bibliographies by topics / Eye Saccadic eye movements. Visual perception

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Academic literature on the topic 'Eye Saccadic eye movements. Visual perception'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Eye Saccadic eye movements. Visual perception"

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Krock, Rebecca M., and Tirin Moore. "Visual sensitivity of frontal eye field neurons during the preparation of saccadic eye movements." Journal of Neurophysiology 116, no. 6 (December 1, 2016): 2882–91. http://dx.doi.org/10.1152/jn.01140.2015.

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Primate vision is continuously disrupted by saccadic eye movements, and yet this disruption goes unperceived. One mechanism thought to reduce perception of this self-generated movement is saccadic suppression, a global loss of visual sensitivity just before, during, and after saccadic eye movements. The frontal eye field (FEF) is a candidate source of neural correlates of saccadic suppression previously observed in visual cortex, because it contributes to the generation of visually guided saccades and modulates visual cortical responses. However, whether the FEF exhibits a perisaccadic reduction in visual sensitivity that could be transmitted to visual cortex is unknown. To determine whether the FEF exhibits a signature of saccadic suppression, we recorded the visual responses of FEF neurons to brief, full-field visual probe stimuli presented during fixation and before onset of saccades directed away from the receptive field in rhesus macaques ( Macaca mulatta). We measured visual sensitivity during both epochs and found that it declines before saccade onset. Visual sensitivity was significantly reduced in visual but not visuomotor neurons. This reduced sensitivity was also present in visual neurons with no movement-related modulation during visually guided saccades and thus occurred independently from movement-related activity. Across the population of visual neurons, sensitivity began declining ∼80 ms before saccade onset. We also observed a similar presaccadic reduction in sensitivity to isoluminant, chromatic stimuli. Our results demonstrate that the signaling of visual information by FEF neurons is reduced during saccade preparation, and thus these neurons exhibit a signature of saccadic suppression.
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Hogendoorn, Hinze. "Voluntary Saccadic Eye Movements Ride the Attentional Rhythm." Journal of Cognitive Neuroscience 28, no. 10 (October 2016): 1625–35. http://dx.doi.org/10.1162/jocn_a_00986.

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Visual perception seems continuous, but recent evidence suggests that the underlying perceptual mechanisms are in fact periodic—particularly visual attention. Because visual attention is closely linked to the preparation of saccadic eye movements, the question arises how periodic attentional processes interact with the preparation and execution of voluntary saccades. In two experiments, human observers made voluntary saccades between two placeholders, monitoring each one for the presentation of a threshold-level target. Detection performance was evaluated as a function of latency with respect to saccade landing. The time course of detection performance revealed oscillations at around 4 Hz both before the saccade at the saccade origin and after the saccade at the saccade destination. Furthermore, oscillations before and after the saccade were in phase, meaning that the saccade did not disrupt or reset the ongoing attentional rhythm. Instead, it seems that voluntary saccades are executed as part of an ongoing attentional rhythm, with the eyes in flight during the troughs of the attentional wave. This finding for the first time demonstrates that periodic attentional mechanisms affect not only perception but also overt motor behavior.
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Seirafi, Mehrdad, Peter De Weerd, and Beatrice de Gelder. "Suppression of Face Perception during Saccadic Eye Movements." Journal of Ophthalmology 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/384510.

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Lack of awareness of a stimulus briefly presented during saccadic eye movement is known as saccadic omission. Studying the reduced visibility of visual stimuli around the time of saccade—known as saccadic suppression—is a key step to investigate saccadic omission. To date, almost all studies have been focused on the reduced visibility of simple stimuli such as flashes and bars. The extension of the results from simple stimuli to more complex objects has been neglected. In two experimental tasks, we measured the subjective and objective awareness of a briefly presented face stimuli during saccadic eye movement. In the first task, we measured the subjective awareness of the visual stimuli and showed that in most of the trials there is no conscious awareness of the faces. In the second task, we measured objective sensitivity in a two-alternative forced choice (2AFC) face detection task, which demonstrated chance-level performance. Here, we provide the first evidence of complete suppression of complex visual stimuli during the saccadic eye movement.
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Ibbotson, Michael, and Bart Krekelberg. "Visual perception and saccadic eye movements." Current Opinion in Neurobiology 21, no. 4 (August 2011): 553–58. http://dx.doi.org/10.1016/j.conb.2011.05.012.

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Prime, Steven L., Michael Vesia, and J. Douglas Crawford. "Cortical mechanisms for trans-saccadic memory and integration of multiple object features." Philosophical Transactions of the Royal Society B: Biological Sciences 366, no. 1564 (February 27, 2011): 540–53. http://dx.doi.org/10.1098/rstb.2010.0184.

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Constructing an internal representation of the world from successive visual fixations, i.e. separated by saccadic eye movements, is known as trans-saccadic perception. Research on trans-saccadic perception (TSP) has been traditionally aimed at resolving the problems of memory capacity and visual integration across saccades. In this paper, we review this literature on TSP with a focus on research showing that egocentric measures of the saccadic eye movement can be used to integrate simple object features across saccades, and that the memory capacity for items retained across saccades, like visual working memory, is restricted to about three to four items. We also review recent transcranial magnetic stimulation experiments which suggest that the right parietal eye field and frontal eye fields play a key functional role in spatial updating of objects in TSP. We conclude by speculating on possible cortical mechanisms for governing egocentric spatial updating of multiple objects in TSP.
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Binda, Paola, and Maria Concetta Morrone. "Vision During Saccadic Eye Movements." Annual Review of Vision Science 4, no. 1 (September 15, 2018): 193–213. http://dx.doi.org/10.1146/annurev-vision-091517-034317.

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The perceptual consequences of eye movements are manifold: Each large saccade is accompanied by a drop of sensitivity to luminance-contrast, low-frequency stimuli, impacting both conscious vision and involuntary responses, including pupillary constrictions. They also produce transient distortions of space, time, and number, which cannot be attributed to the mere motion on the retinae. All these are signs that the visual system evokes active processes to predict and counteract the consequences of saccades. We propose that a key mechanism is the reorganization of spatiotemporal visual fields, which transiently increases the temporal and spatial uncertainty of visual representations just before and during saccades. On one hand, this accounts for the spatiotemporal distortions of visual perception; on the other hand, it implements a mechanism for fusing pre- and postsaccadic stimuli. This, together with the active suppression of motion signals, ensures the stability and continuity of our visual experience.
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Awater, Holger, and Markus Lappe. "Perception of Visual Space at the Time of Pro- and Anti-Saccades." Journal of Neurophysiology 91, no. 6 (June 2004): 2457–64. http://dx.doi.org/10.1152/jn.00821.2003.

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The localization of peri-saccadically flashed objects shows two types of errors: first, a uniform shift in saccade direction, and second, a compression of visual space around the saccade target. Whereas the uniform shift occurs when the experiment is performed in complete darkness compression occurs when additional visual references are available. Thus peri-saccadic mislocalization contains motor and visual components. To distinguish between both factors we compared peri-saccadic localization errors during pro- and anti-saccades. In the case of anti-saccades, the visual cue that elicits the saccade and the actual eye movement are in opposite directions. We asked whether peri-saccadic compression can be observed with anti-saccades, and if so, whether the compression is directed toward the visual cue or follows the actual eye movement. In blocked trials, subjects performed saccades either toward a visual cue (pro-saccade) or to the mirrored position opposite to a visual cue (anti-saccade). Peri-saccadically, we flashed a thin vertical bar at one of four possible locations. Subjects had to indicate the perceived position of the bar with a mouse pointer about 500 ms after the saccade. Experiments were performed in complete darkness and with visual references. Peri-saccadic mislocalizations occurred during anti-saccades. The mislocalizations were very similar for pro- and anti-saccades in magnitude and direction. For both, pro- and anti-saccades, mislocalizations were directed toward the actual eye movement and not the visual cue.
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Goettker, Alexander, Doris I. Braun, Alexander C. Schütz, and Karl R. Gegenfurtner. "Execution of saccadic eye movements affects speed perception." Proceedings of the National Academy of Sciences 115, no. 9 (February 13, 2018): 2240–45. http://dx.doi.org/10.1073/pnas.1704799115.

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Due to the foveal organization of our visual system we have to constantly move our eyes to gain precise information about our environment. Doing so massively alters the retinal input. This is problematic for the perception of moving objects, because physical motion and retinal motion become decoupled and the brain has to discount the eye movements to recover the speed of moving objects. Two different types of eye movements, pursuit and saccades, are combined for tracking. We investigated how the way we track moving targets can affect the perceived target speed. We found that the execution of corrective saccades during pursuit initiation modifies how fast the target is perceived compared with pure pursuit. When participants executed a forward (catch-up) saccade they perceived the target to be moving faster. When they executed a backward saccade they perceived the target to be moving more slowly. Variations in pursuit velocity without corrective saccades did not affect perceptual judgments. We present a model for these effects, assuming that the eye velocity signal for small corrective saccades gets integrated with the retinal velocity signal during pursuit. In our model, the execution of corrective saccades modulates the integration of these two signals by giving less weight to the retinal information around the time of corrective saccades.
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Chen, Jing, Matteo Valsecchi, and Karl R. Gegenfurtner. "Saccadic suppression measured by steady-state visual evoked potentials." Journal of Neurophysiology 122, no. 1 (July 1, 2019): 251–58. http://dx.doi.org/10.1152/jn.00712.2018.

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Visual sensitivity is severely impaired during the execution of saccadic eye movements. This phenomenon has been extensively characterized in human psychophysics and nonhuman primate single-neuron studies, but a physiological characterization in humans is less established. Here, we used a method based on steady-state visually evoked potential (SSVEP), an oscillatory brain response to periodic visual stimulation, to examine how saccades affect visual sensitivity. Observers made horizontal saccades back and forth, while horizontal black-and-white gratings flickered at 5–30 Hz in the background. We analyzed EEG epochs with a length of 0.3 s either centered at saccade onset (saccade epochs) or centered at fixations half a second before the saccade (fixation epochs). Compared with fixation epochs, saccade epochs showed a broadband power increase, which most likely resulted from saccade-related EEG activity. The execution of saccades, however, led to an average reduction of 57% in the SSVEP amplitude at the stimulation frequency. This result provides additional evidence for an active saccadic suppression in the early visual cortex in humans. Compared with previous functional MRI and EEG studies, an advantage of this approach lies in its capability to trace the temporal dynamics of neural activity throughout the time course of a saccade. In contrast to previous electrophysiological studies in nonhuman primates, we did not find any evidence for postsaccadic enhancement, even though simulation results show that our method would have been able to detect it. We conclude that SSVEP is a useful technique to investigate the neural correlates of visual perception during saccadic eye movements in humans. NEW & NOTEWORTHY We make fast ballistic saccadic eye movements a few times every second. At the time of saccades, visual sensitivity is severely impaired. The present study uses steady-state visually evoked potentials to reveal a neural correlate of the fine temporal dynamics of these modulations at the time of saccades in humans. We observed a strong reduction (57%) of visually driven neural activity associated with saccades but did not find any evidence for postsaccadic enhancement.
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Ignashchenkova, A., S. Dash, P. W. Dicke, T. Haarmeier, M. Glickstein, and P. Thier. "Normal Spatial Attention But Impaired Saccades and Visual Motion Perception After Lesions of the Monkey Cerebellum." Journal of Neurophysiology 102, no. 6 (December 2009): 3156–68. http://dx.doi.org/10.1152/jn.00659.2009.

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Lesions of the cerebellum produce deficits in movement and motor learning. Saccadic dysmetria, for example, is caused by lesions of the posterior cerebellar vermis. Monkeys and patients with such lesions are unable to modify the amplitude of saccades. Some have suggested that the effects on eye movements might reflect a more global cognitive deficit caused by the cerebellar lesion. We tested that idea by studying the effects of vermis lesions on attention as well as saccadic eye movements, visual motion perception, and luminance change detection. Lesions in posterior vermis of four monkeys caused the known deficits in saccadic control. Attention tested by examination of acuity threshold changes induced by prior cueing of the location of the targets remained normal after vermis lesions. Luminance change detection was also unaffected by the lesions. In one case, after a lesion restricted to lobulus VIII, the animal had impaired visual motion perception.
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Dissertations / Theses on the topic "Eye Saccadic eye movements. Visual perception"

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Richard, Alby-Réal. "The interaction of visual perception and saccadic eye movements." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123018.

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Primates have evolved to make high velocity, ballistic eye movements called saccades approximately three to five times per second in order to orient the high resolution part of their retina, or fovea, towards objects of interest. While saccades are generally adaptive in most situations, they also present the brain with certain challenges in order maintain a stable perception of the world. With every movement of the visual axis involving the eyes alone or through a combined eye-head gaze shift, the retina is presented with a rapidly changing view of the world. Most observers are not aware of the actual flow of incoming retinal information during a saccade, and instead perceive the world as being stable from one gaze movement to the next. How the brain accomplishes this stability has been referred to as the problem of 'trans-saccadic' perceptual stability. While this problem been pondered for more than a century by philosophers, psychologists, and neuroscientists, there is still no consensus on the precise mechanism by which visual stability is achieved. One way to approach the problem of perceptual stability is to study the way in which visual perception changes around the time of saccades. It is well known that objects briefly presented around the time of saccadic eye movements are not perceived at their veridical location, a phenomenon called perisaccadic mislocalization. Most observers make errors of two types that are predictable and systematic: a translational shift in the direction of the saccade, and compression towards the target location. This later effect, the compression of visual space towards the saccade target, is the primary phenomenon through which this thesis sought to understand the mechanisms responsible for visual stability across saccades. To this end, a series of psychophysical experiments were conducted to explore which signals may be involved in computing where an object was in space around the time of a saccade. In the fist paper, we described a biological framework in which an oculomotor signal encoding the gaze command interacts with a visual signal encoding afferent information. The outcome of this interaction was related to the perceived position of the object presented around the time of the saccade, and this formulation was able to capture both our results in addition to data from outside our laboratory. After successfully modelling the compression effect within a plausible biological framework, the next paper focused on elucidating the nature of the oculomotor signal. We accomplished this by testing observers in a variety of conditions aimed to disambiguate whether the signal was encoding the eye movement alone or the eye-head gaze shift, and found that compression was indeed linked to the eye-head gaze shift. Moreover, the experiments performed allowed us to further describe the parameters involved in modulating the compression effect. With our understanding of the compression effect and the likely biological signals involved, we then used this model to gain an enhanced understanding of how perisaccadic visual perception may be altered in patients with schizophrenia. The final paper examines the postulate that patients with schizophrenia may have an altered corollary discharge signal in the visual pathway for saccadic eye movements. With this study we were able to show that these patients do in fact exhibit qualitative differences in mislocalization compared to controls, and that these are attributable to a noisy corollary discharge that encodes the eye's position in space. This thesis comprises a systematic overview of what signals are involved in maintaining perceptual stability across saccadic eye and head movements. We have been able to investigate these signals through a combination of psychophysical studies and computational modeling. Finally, we used these paradigms to understand how these signaling mechanisms are altered in patients with schizophrenia.
Au cours de l'évolution, les primates ont développé des mouvements oculaires rapides, ou les saccades. Bien que les saccades soient généralement une fonction adaptive, elles engendrent des défis important au près du système visuel qui cherche à maintenir une perception stable sur le monde. À chaque mouvement de l'axe visuel, que ce soit les yeux seuls ou la tête en combinaison avec les yeux, la rétine reçoit une nouvelle image du monde. La majorité des observateurs n'a pas conscience de ce flux important d'information rétinienne discontinue et perçoit plutôt un monde stable d'un regard à l'autre. Ce phénomène de consolidation de l'influx visuel saccadé en une perception stable et fluide du monde est intitulé le problème de la « perception stable trans-saccadique ». Le phénomène de la « perception stable trans-saccadique » peut être étudié par le biais d'une approche scientifique rigoureuse qui se penche sur la manière dont la perception visuelle évolue à travers les mouvements oculaires. Notamment, il a été démontré que les cibles présentées très brièvement lors d'un saccade sont perçu de façon erronée par rapport à leur emplacement spatial véridique, le phénomène des erreurs de localization peri-saccadique (ELPS). Ces erreurs prédictibles et systématiques sont de deux types : le premier est un simple déplacement dans la direction de la saccade ; le deuxième est sous forme de compression vers l'objet cible. Ce dernier type d'erreur, la compression du champ visuelle vers l'objet de la saccade, est le phénomène principal dont cette thèse s'est servi pour étudier les mécanismes qui engendrent la stabilité visuelle lors des saccades. Une série d'expérience psychophysique a donc été réalisée pour explorer les signaux qui entre en jeux lors du jugement spatial de la cible d'une saccade.Dans le premier chapitre, nous avons élucidé un schéma expérimental qui décrit l'interaction d'un signal oculomoteur qui encode le mouvement oculaire avec un signal visuel qui encode la position de la cible. Selon notre formulation, l'issue de cette interaction est directement reliée au positionnement perçu de la cible qui est présentée autour d'une saccade. Ce modèle a reproduit non seulement les résultats de notre laboratoire mais aussi ceux d'un collaborateur extérieur dont nous avons reçus que les données brutes. Suite à ce premier succès, lors du deuxième chapitre nous nous sommes orientés vers la nature même du signal oculomoteur. Nous avons accomplit cette tache en utilisant une variété de conditions expérimentales qui visaient à préciser si le signal visuel encodait le mouvement oculaire seule ou en conjonction avec le mouvement de la tête. Nos résultats ont clairement démontré que le phénomène de compression est en effet lié à la combinaison des mouvements des yeux et de la tête, que la compression était vers le but du regard et non l'objet de la saccade en tant que tel. Ces expériences nous ont aussi permis de décrire plus précisément les paramètres et les conditions qui affectent la compression. Armé de notre compréhension de l'effet de compression ci-haut et de ses signaux biologiques probables, lors du dernier chapitre nous avons employés notre model biologique pour comprendre davantage la manière dont la vision chez les patients atteints de la schizophrénie pourrait être altérée lors des saccades. Plus spécifiquement, nous avons étudié l'hypothèse que la décharge corollaire (DC) des voies optiques pourrait être altérée chez les patients schizophrènes. Nos études ont en effet souligné que lors des saccades, les patients schizophrènes démontrent des différences qualitatives en terme d'erreur de localisation de signal par rapport aux patients du groupe témoin. Le résultat de cette étude à démontrer que le DC dans les schizophrènes était différent que chez les contrôles, et que cette différence était suffisante pour expliquer les différences remarquées dans leur perception visuelle autour des saccades.
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Diamond, Mark R. "The effect of saccades on visual sensitivity and time perception /." Connect to this title, 2002. http://theses.library.uwa.edu.au/adt-WU2003.0038.

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Diamond, Mark R. "The effect of saccades on visual sensitivity and time perception." University of Western Australia. School of Psychology, 2003. http://theses.library.uwa.edu.au/adt-WU2003.0038.

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Considerable evidence indicates that visual sensitivity is reduced during saccadic eye movement. A central question has been whether saccadic suppression results from a non-visual central signal, or whether the obligate image motion that accompanies saccades is itself sufficient to mask vision. In the first of a series of experiments described here, the visual and non-visual effects of saccades were distinguished by measuring contrast sensitivity to luminance modulated low spatial frequency gratings, at 17 cd·m¯² and 0.17 cd·m¯², in saccade conditions and in conditions in which saccade-like image motion was produced by the rotation of a mirror but when observers’ eyes were kept still. The time course of suppression was examined by making measurements from well before image motion began until well after it had ended. A tenfold decrease in contrast sensitivity was found for luminance-modulated gratings with saccades, but little suppression was found with simulated saccades. Adding high contrast noise to the visual display increased the magnitude and the duration of the suppression during simulated saccades but had little effect on suppression produced by real saccades. At lower luminance, suppression was found to be reduced, and its course shallower than at higher luminance. Simulated saccades produced shallower suppression over a longer time course at both higher and lower luminance. In a second experiment the time course of contrast sensitivity to chromatically modulated gratings, at 17 cd·m¯², was examined. No suppression was found; rather there was some evidence of an enhancement of sensitivity, both before and after saccades, relative to fixation conditions. Differences in the effects of real and simulated saccades in the magnitude and time course of sensitivity loss with luminance modulated gratings suggest that saccadic suppression has an extraretinal component that acts on the magnocellular system; the pattern of enhancement found in the later experiment suggests a selective favouring of the parvocellular system both immediately prior to and immediately after saccades. The possibility that the degree of enhancement in sensitivity varies across the visual field was examined using spatially localized stimuli (either high spatial frequency chromatically modulated gratings or letter combinations). Sensitivity was found to decrease at the initial fixation point during the 75 ms prior to saccadic onset and simultaneously to improve at the saccadic target. In the immediate post-saccadic period, sensitivity at the saccadic target was found to exceed that which had been manifest at the initial fixation point prior to saccades, suggesting that post-saccadic enhancement may improve the temporal contrast between one fixation and the next. The final experiments investigated the possibility that our sense of continuity across saccades (as opposed to stability) is influenced by saccade-induced errors in locating events in time. The results of these experiments suggest that saccades can result in errors in judging (a) the time at which external events occur relative to saccadic onset, (b) the temporal order of visual events, and (c) the magnitude of temporal intervals. It is concluded that apparent time is generally foreshortened prior to saccades. This might be due to selective suppression of magnocellular activity and might function to hide saccades and their effects from our awareness. A speculative synthesis is presented based on the idea that recurrent feedback between the neocortical and cortical structures on the one hand, and the thalamic nuclei on the other, has special importance for perception around the time of saccades
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Whitchurch, Elizabeth A. "Audiovisual integration in the saccadic system of the barn owl /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1280135971&sid=3&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2006.
Typescript. Includes vita and abstract. "These investigations were supported in part by the National Institute on Deafness and Communication Disorders ... and the National Institute of General Medical Sciences"--P. viii. Includes bibliographical references (leaves 142-152). Also available for download via the World Wide Web; free to University of Oregon users.
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Awater, Holger. "Perception of visual space at the time of saccadic eye movements Wahrnehmung des visuellen Raumes im Zeitraum sakkadischer Augenbewegungen /." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965503003.

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Ziesche, Arnold, and Fred H. Hamker. "Brain circuits underlying visual stability across eye movements—converging evidence for a neuro-computational model of area LIP." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-147862.

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The understanding of the subjective experience of a visually stable world despite the occurrence of an observer's eye movements has been the focus of extensive research for over 20 years. These studies have revealed fundamental mechanisms such as anticipatory receptive field (RF) shifts and the saccadic suppression of stimulus displacements, yet there currently exists no single explanatory framework for these observations. We show that a previously presented neuro-computational model of peri-saccadic mislocalization accounts for the phenomenon of predictive remapping and for the observation of saccadic suppression of displacement (SSD). This converging evidence allows us to identify the potential ingredients of perceptual stability that generalize beyond different data sets in a formal physiology-based model. In particular we propose that predictive remapping stabilizes the visual world across saccades by introducing a feedback loop and, as an emergent result, small displacements of stimuli are not noticed by the visual system. The model provides a link from neural dynamics, to neural mechanism and finally to behavior, and thus offers a testable comprehensive framework of visual stability.
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Szinte, Martin. "The recovery of target locations in space across movements of eyes and head." Phd thesis, Université René Descartes - Paris V, 2012. http://tel.archives-ouvertes.fr/tel-00760375.

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The visual system has evolved to deal with the consequences of our own movements onour perception. In particular, evolution has given us the ability to perceive our visual world as stableand continuous despite large shift of the image on our retinas when we move our eyes, head orbody. Animal studies have recently shown that in some cortical and sub-cortical areas involved inattention and saccade control, neurons are able to anticipate the consequences of voluntary eyemovements on their visual input. These neurons predict how the world will look like after a saccadeby remapping the location of each attended object to the place it will occupy following a saccade.In a series of studies, we first showed that remapping could be evaluated in a non-invasive fashion in human with simple apparent motion targets. Using eye movement recordingsand psychophysical methods, we evaluated the distribution of remapping errors across the visualfield and found that saccade compensation was fairly accurate. The pattern of errors observedsupport a model of space constancy based on a remapping of attention pointers and excluded otherknown models. Then using targets that moved continuously while a saccade was made across themotion path, we were able to directly visualize the remapping processes. With this novel method wedemonstrated again the existence of systematic errors of correction for the saccade, best explainedby an inaccurate remapping of expected moving target locations. We then extended our model toother body movements, and studied the contribution of sub-cortical receptors (otoliths and semi-circular canals) in the maintenance of space constancy across head movements. Contrary tostudies reporting almost perfect compensations for head movements, we observed breakdowns ofspace constancy for head tilt as well as for head translation. Then, we tested remapping of targetlocations to correct for saccades at the very edge of the visual field, remapping that would place theexpected target location outside the visual field. Our results suggest that visual areas involved inremapping construct a global representation of space extending out beyond the traditional visualfield. Finally, we conducted experiments to determine the allocation of attention across saccades.We demonstrated that the attention captured by a brief transient was remapped to the correctspatial location after the eye movement and that this shift can be observed even before thesaccade.Taken together these results demonstrate the management of attention pointers to therecovery of target locations in space as well as the ability of behavioral measurements to address atopic pioneered by eletrophysiologists.
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Tagu, Jérôme. "Le rôle de la dominance oculaire dans la boucle perception-action : une propriété à l'origine d'asymétries perceptives et motrices How eye dominance strength modulates the influence of a distractor on saccade accuracy Isoler les effets de la dominance oculaire et du biais attentionnel sur la précision des saccades Influence de la dominance oculaire sur les sélections oculomotrice et attentionnelle Recentering bias for temporal saccades only: evidence from binocular recordings of eye movements Quantifying eye dominance strength – New insights into the neurophysiological bases of saccadic asymmetries." Thesis, Sorbonne Paris Cité, 2018. https://wo.app.u-paris.fr/cgi-bin/WebObjects/TheseWeb.woa/wa/show?t=1818&f=14763.

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L'homme présente plusieurs préférences latérales, utilisant plutôt une main, un pied et un œil donnés. Si l'impact de la latéralité manuelle sur les performances perceptives et motrices a été très étudié, le rôle des autres latéralités est mal connu. Le premier axe de cette thèse avait pour objectif de mieux comprendre la place de la dominance oculaire dans les processus perceptivo-moteurs. L’œil dominant est celui choisi lors de la réalisation d'une tâche monoculaire. La neuroimagerie a montré qu'il était lié au cortex visuel primaire ipsilatéral, et du fait du croisement des voies optiques, à l'hémichamp visuel controlatéral. Dans cette thèse nous avons comparé les performances perceptives et oculomotrices dans les hémichamps controlatéral et ipsilatéral à l’œil dominant. Les participants devaient soit réaliser des saccades oculaires vers la gauche ou vers la droite, soit réaliser une tâche de discrimination visuelle sur une cible présentée à gauche ou à droite, soit réaliser une double-tâche de saccades et discrimination visuelle. Ces études ont montré que la relation entre l’œil dominant et le cortex visuel primaire ipsilatéral permettait un rehaussement perceptif des cibles visuelles de l'hémichamp controlatéral comparées à celles de l'hémichamp ipsilatéral. Ce rehaussement perceptif améliore à la fois les performances de discrimination visuelle et la précision des saccades oculaires dans l'hémichamp controlatéral à l’œil dominant comparé à l'hémichamp ipsilatéral. Nous avons ainsi montré que la dominance oculaire occupait une place importante dans les relations perception-action, engendrant des différences de traitement entre hémichamps visuels. Dans un deuxième axe, nous nous sommes intéressés à la quantification de la dominance oculaire. Contrairement aux questionnaires de latéralité manuelle permettant une mesure en pourcentages, les tests actuels de dominance oculaire ne fournissent qu'une mesure binaire (gauche ou droite). En vue d'attribuer à chaque individu un pourcentage de dominance oculaire, nous avons étudié les asymétries du système saccadique. Les saccades oculaires présentent en effet des pics de vitesse plus élevés vers la tempe (saccades vers la gauche de l’œil gauche et saccades vers la droite de l’œil droit) que vers le nez (saccades vers la droite de l’œil gauche et saccades vers la gauche de l’œil droit). Cette asymétrie semble liée à l'intensité de la dominance oculaire en ne s'exprimant que chez les participants ayant une dominance oculaire faible. En cas d'une forte dominance oculaire, les pics de vitesse sont plus élevés vers l'hémichamp ipsilatéral à l’œil dominant, que la saccade soit nasale ou temporale. Dans la présente thèse, nous avons également testé d'autres asymétries saccadiques avec l'idée que l'étude simultanée de plusieurs asymétries permettrait une quantification graduelle de dominance oculaire. Notamment, les pics de vitesse sont aussi plus élevés pour les saccades centripètes (vers le droit-devant) que centrifuges (vers l'extérieur). Nous avons utilisé une tâche de saccades depuis cinq positions de départ (afin d'analyser des saccades centripètes et centrifuges) et un enregistrement binoculaire (afin d'analyser des saccades temporales et nasales). Les résultats montrent (1) que les deux asymétries saccadiques sont liées, suggérant qu'elles partagent des bases neurophysiologiques communes, (2) que la dominance oculaire influence toutes les asymétries testées et (3) que l'analyse simultanée des deux asymétries permet d'assigner à chaque individu un pourcentage de dominance oculaire. L'absence de dominance oculaire correspondait à la manifestation de toutes les asymétries saccadiques, tandis qu'une dominance oculaire maximale correspondait à l'absence d'asymétries. Ainsi, cette thèse aura précisé les rôles de la dominance oculaire dans la boucle perception-action et permis d'élaborer une mesure graduelle de dominance oculaire, basée sur les performances visuo-motrices
Humans present several lateral preferences, using more a given hand, foot and eye than the other one. If handedness has already been shown to influence perceptual and motor performance, the role of other lateral preferences is currently unknown. The first part of this thesis is dedicated to the study of the influence of eye dominance on visuo-motor tasks. The dominant eye, the one used to perform monocular tasks, is linked to the ipsilateral primary visual cortex. As such, it I s also linked to the contralateral hemifield. In this thesis, we thus compared performance in the contralateral and ipsilatereral hemifields relative to the dominant eye. Participants had either to make leftward and rightward saccades, a visual discrimination task, or both simultaneously. These studies have shown that the relationship between the dominant eye and the ipsilateral primary visual cortex induced a greater perceptual enhancement of visual targets presented in the contralateral than ipsilateral hemifield relative to the dominant eye. This perceptual enhancement leaded to both higher discrimination performance and higher saccade accuracy in this hemifield compared to the ipsilateral one. Thereby, we showed that eye dominance was an important property to consider in the perception-action links, leading to asymmetries between hemifields. In a second part of this thesis, we focused on the quantification of eye dominance. Indeed, contrary to handedness questionnaires which provide a percentage-based measure, tests of eye dominance only dissociate between left and right eye dominance. To assign to each participant a percentage of eye dominance, we studied the asymmetries of the saccadic system. Saccadic peak velocity is indeed higher toward the temple (i.e., rightward saccades of the right eye and leftward saccades of the left eye) than toward the nose (i.e., leftward saccades of the right eye and rightward saccades of the right eye). This asymmetry seems linked to the strength of eye dominance, as it is only observed in case of weak eye dominance. People with strong eye dominance show higher saccadic peak velocity toward the hemifield ipsilateral to their dominant eye, irrespective of the temporal or nasal nature of the saccade. In this thesis, we simultaneously tested several saccadic asymmetries, with the idea that it could provide a graduated measure of eye dominance strength. Peak velocities are also higher for centripetal (toward the straight-ahead direction) than centrifugal (away from the straight-ahead direction) saccades. Participants had to make saccades from five different starting position (to elicit centripetal and centrifugal saccades) while the movements of their both eyes were recorded (to analyze temporal and nasal saccades). The results showed (1) that both saccadic asymmetries are linked together, suggesting that they share a common structure in their neurophysiological bases, (2) that eye dominance modulates all the saccadic asymmetries tested, and (3) that the study of several saccadic asymmetries allows quantifying eye dominance strength on a percentage-based continuous model. Observation of huge saccadic asymmetries corresponded to very weak eye dominance, whereas strong eye dominance was associated to no asymmetry. All in all, in this thesis we clarified the roles of eye dominance in the perception-action loop, and we computed a graduated measure of eye dominance strength based on oculomotor performance
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Eymond, Cécile. "L'attention sélective et les traits visuels dans la correspondance transsaccadique." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB234.

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Chaque saccade oculaire décale brusquement l'image projetée sur la rétine. Pourtant notre perception du monde reste stable et uniforme car le système visuel fait correspondre les informations avant et après chaque saccade. Pour établir cette correspondance, les mécanismes attentionnels seraient fondamentaux. Jusqu'à présent, ce lien transsaccadique a été mis en évidence par des études portant essentiellement sur le traitement des informations spatiales - à savoir, comment la position rétinienne d'un objet est corrigée à chaque saccade pour maintenir une perception stable du monde. Le traitement des traits visuels tels que la couleur ou la forme est encore mal compris et leur rôle dans l'impression de stabilité reste à établir. Est-ce que les traits et l'attention dédiée aux traits (feature-based attention), par définition indépendants de l'espace, participent aussi à la correspondance transsaccadique ? Pour analyser la relation entre le traitement des traits et celui des positions lors des saccades oculaires, cette thèse a suivi deux approches. La première s'est intéressée à la perception des attributs visuels, uniforme malgré l'hétérogénéité du système visuel. Les résultats ont montré que si la perception uniforme des attributs visuels s'appuie sur un apprentissage, les mécanismes sous-jacents ne seraient pas spécifiques aux mouvements oculaires. L'uniformité de la perception s'appuierait plutôt sur un mécanisme d'apprentissage associatif général. La seconde approche a cherché à mieux comprendre la nature de l'attention sélective transsaccadique. Les résultats ont montré que l'attention allouée à la cible d'une saccade ne contribue pas à aux mécanismes sélectifs guidés par les traits et engagés juste après l'exécution d'un mouvement oculaire. L'attention allouée à une cible saccadique et l'attention aux traits seraient alors indépendantes. Enfin, la dernière étude a montré que, lorsque l'attention sélective basée sur les traits est engagée pendant la préparation de la saccade en dehors de la cible saccadique, les traits sont maintenus pendant la saccade et affectent les processus sélectifs engagés juste après la saccade. L'attention transsaccadique ne serait alors pas de nature purement spatiale. L'ensemble de ces résultats suggère que les traits et l'attention aux traits joueraient un rôle dans la correspondance transsaccadique
With each saccade, the image on the retina shifts abruptly but our perception of the surrounding world remains stable and uniform, because the visual system matches pre- and post-saccadic visual information. Attentional mechanisms could play a fundamental role in this process and numerous studies have examined the role of spatial attention. The processing of feature-based attention across saccades remains unclear and its role in matching pre- to post-saccadic visual information is not known. Do visual features and feature-based attention, assumed to enhance the feature-specific representations throughout the visual field, take part in the transsaccadic correspondence? To examine the relationship between feature and spatial processing, this thesis chose two approaches. The first one considered the uniform perception that we have for features despite the heterogeneity of the retina. Results show that, if the transsaccadic correspondence of visual features relies on learning, the underlying mechanisms would not be specific to eye movements. Visual constancy is more likely to arise from a general associative learning. The second approach examined the nature of transsaccadique attention. Results show that attention drawn to the saccade target did not contribute to selective mechanisms engaged just after an eye movement, suggesting a dissociation between feature-based attention and saccade programming. Finally, the last study show that feature-based selectivity is maintained across saccades to ensure spatiotopic correspondence, pointing out the potential role of feature-based attention in matching pre- to post-saccadic information
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Notice, Keisha Joy. "Visual working memory and saccadic eye movements." Thesis, Anglia Ruskin University, 2013. http://arro.anglia.ac.uk/332975/.

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Saccadic eye movements, produced by the oculomotor system, are used to bring salient information in line with the high resolution fovea. It has been suggested that visual working memory, the cognitive system that temporarily stores and manipulates visual information (Baddeley & Hitch, 1974), is utilised by the oculomotor system in order to maintain saccade programmes across temporal delays (Belopolsky & Theeuwes, 2011). Saccadic eye movements have been found to deviate away from information stored in visual working memory (Theeuwes and colleagues, 2005, 2006). Saccadic deviation away from presented visual stimuli has been associated with top-down suppression (McSorley, Haggard, & Walker, 2006). This thesis examines the extent to which saccade trajectories are influenced by information held in visual working memory. Through a series of experiments behavioural memory data and saccade trajectory data were explored and evidence for visual working memory-oculomotor interaction was found. Other findings included specific interactions with the oculomotor system for the dorsal and ventral pathways as well as evidence for both bottom-up and top-down processing. Evidence of further oculomotor interaction with manual cognitive mechanisms was also illustrated, suggesting that visual working memory does not uniquely interact with the oculomotor system to preserve saccade programmes. The clinical and theoretical implications of this thesis are explored. It is proposed that the oculomotor system may interact with a variety of sensory systems to inform accurate and efficient visual processing.
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Books on the topic "Eye Saccadic eye movements. Visual perception"

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Transsakkadische Informationsverarbeitung im visuellen System: Auswirkungen auf Wahrnehmung und Mustererkennung. Regensburg: S. Roderer, 1993.

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Doma, Hansraj. Aspects of saccadic eye-movements towards or away from photopic, mesopic, or scotopic stimuli. Toronto: University of Toronto, Department of Physiology, 1986.

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Pogled i slika =: Eye movements and pictures. Zagreb: Hermes, 1996.

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Barabanshchikov, V. A. Sistemogenez chuvstvennogo vosprii︠a︡tii︠a︡. Moskva: Moskovskiĭ psikhologo-sot︠s︡ialʹnyĭ in-t, 2000.

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Stone, Leland S. On the visual input driving human smooth-pursuit eye movements. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1996.

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Stone, Leland S. On the visual input driving human smooth-pursuit eye movements. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1996.

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Fedorovich, Lomov Boris, ed. Sistemnai͡a︡ organizat͡s︡ii͡a︡ zritelʹnykh funkt͡s︡iĭ. Moskva: "Nauka", 1988.

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W, Tatler Benjamin, ed. Looking and acting: Vision and eye movements in natural behaviour. Oxford: Oxford University Press, 2009.

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Land, Michael F. Looking and acting: Vision and eye movements in natural behaviour. Oxford: Oxford University Press, 2009.

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Blickbewegungsmuster bei der Wiedererkennung piktorialen Materials. Münster: Lit, 1986.

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Book chapters on the topic "Eye Saccadic eye movements. Visual perception"

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Greenlee, Mark W., and Hubert Kimmig. "Visual Perception and Eye Movements." In Eye Movement Research, 165–96. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20085-5_5.

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Findlay, John M., and Trevor I. Crawford. "The Visual Control of Saccadic Eye Movements: Evidence for Limited Plasticity." In Eye Movements and Psychological Functions, 115–27. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003165538-11.

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Hafed, Ziad M., and Richard J. Krauzlis. "Interactions Between Perception and Smooth Pursuit Eye Movements." In Dynamics of Visual Motion Processing, 189–211. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0781-3_9.

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Ilg, Uwe J., Jan Churan, and Stefan Schumann. "The Physiological Basis for Visual Motion Perception and Visually Guided Eye Movements." In The Primate Visual System, 285–310. Chichester, UK: John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470868112.ch10.

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Kimmig, H., C. Pinnow, T. Mergner, and M. Greenlee. "Smooth Pursuit Eye Movements in Patients with Impaired Visual Motion Perception." In Multisensory Control of Posture, 325–29. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1931-7_41.

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Munoz, Douglas P., Karen A. Hampton, Kim D. Moore, and Jenny E. Goldring. "Control of Purposive Saccadic Eye Movements and Visual Fixation in Children with Attention-Deficit Hyperactivity Disorder." In Current Oculomotor Research, 415–23. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4757-3054-8_58.

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Khellat-Kihel, Souad, Zhenan Sun, and Massimo Tistarelli. "An Hybrid Attention-Based System for the Prediction of Facial Attributes." In Lecture Notes in Computer Science, 116–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-82427-3_9.

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AbstractRecent research on face analysis has demonstrated the richness of information embedded in feature vectors extracted from a deep convolutional neural network. Even though deep learning achieved a very high performance on several challenging visual tasks, such as determining the identity, age, gender and race, it still lacks a well grounded theory which allows to properly understand the processes taking place inside the network layers. Therefore, most of the underlying processes are unknown and not easy to control. On the other hand, the human visual system follows a well understood process in analyzing a scene or an object, such as a face. The direction of the eye gaze is repeatedly directed, through purposively planned saccadic movements, towards salient regions to capture several details. In this paper we propose to capitalize on the knowledge of the saccadic human visual processes to design a system to predict facial attributes embedding a biologically-inspired network architecture, the HMAX. The architecture is tailored to predict attributes with different textural information and conveying different semantic meaning, such as attributes related and unrelated to the subject’s identity. Salient points on the face are extracted from the outputs of the S2 layer of the HMAX architecture and fed to a local texture characterization module based on LBP (Local Binary Pattern). The resulting feature vector is used to perform a binary classification on a set of pre-defined visual attributes. The devised system allows to distill a very informative, yet robust, representation of the imaged faces, allowing to obtain high performance but with a much simpler architecture as compared to a deep convolutional neural network. Several experiments performed on publicly available, challenging, large datasets demonstrate the validity of the proposed approach.
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Banerjee, Anwesha, Ankita Mazumder, Poulami Ghosh, and D. N. Tibarewala. "Visual Perception from Object Scanning as Revealed by Electrooculography." In Advances in Bioinformatics and Biomedical Engineering, 147–63. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8811-7.ch007.

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We the human beings are blessed by the nature to become well competent for performing highly precise and copious visual processes with how ever a restricted field of view. Howbeit, this process of visual perception is, to a great extent, controlled by the saccades or more commonly the eye movements. The positioning and accommodation of eyes allows an image to be placed (or fixed) in the fovea centralis of the eyes but although we do so to fix our gaze at a particular object, our eyes continuously move. Even though these fixational eye movements includes magnitude that should make them visible to us yet we remain oblivious to them. Microsacades, drifts and tremors that occurs frequently during fixational eye movements, contribute largely to the visual perception. We use saccades several times per second to move the fovea between points of interest and build an understanding of our visual environment.
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Banerjee, Anwesha, Ankita Mazumder, Poulami Ghosh, and D. N. Tibarewala. "Visual Perception from Object Scanning as Revealed by Electrooculography." In Ophthalmology, 98–114. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5195-9.ch007.

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We the human beings are blessed by the nature to become well competent for performing highly precise and copious visual processes with how ever a restricted field of view. Howbeit, this process of visual perception is, to a great extent, controlled by the saccades or more commonly the eye movements. The positioning and accommodation of eyes allows an image to be placed (or fixed) in the fovea centralis of the eyes but although we do so to fix our gaze at a particular object, our eyes continuously move. Even though these fixational eye movements includes magnitude that should make them visible to us yet we remain oblivious to them. Microsacades, drifts and tremors that occurs frequently during fixational eye movements, contribute largely to the visual perception. We use saccades several times per second to move the fovea between points of interest and build an understanding of our visual environment.
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Deubel, Heiner. "Chapter 5 Visual processing and cognitive factors in the generation of saccadic eye movements." In Perception, 143–89. Elsevier, 1996. http://dx.doi.org/10.1016/s1874-5822(96)80008-9.

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Conference papers on the topic "Eye Saccadic eye movements. Visual perception"

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Tauscher, Jan-Philipp, Fabian Wolf Schottky, Steve Grogorick, Marcus Magnor, and Maryam Mustafa. "Analysis of neural correlates of saccadic eye movements." In SAP '18: ACM Symposium on Applied Perception 2018. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3225153.3225164.

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Welke, Kai, Tamim Asfour, and Rudiger Dillmann. "Bayesian visual feature integration with saccadic eye movements." In 2009 9th IEEE-RAS International Conference on Humanoid Robots (Humanoids 2009). IEEE, 2009. http://dx.doi.org/10.1109/ichr.2009.5379570.

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Yang, Shun-nan, Ju Liu, Juliana Knopf, Hannah Colett, and Philip J. Corriveau. "Assessment of lossy images with visual detection and saccadic eye movements." In 2017 Ninth International Conference on Quality of Multimedia Experience (QoMEX). IEEE, 2017. http://dx.doi.org/10.1109/qomex.2017.7965685.

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Smelinska, Barbara. "Optical Model Of Eye Movements During Visual Perception." In 6th Mtg in Israel on Optical Engineering, edited by Rami Finkler and Joseph Shamir. SPIE, 1989. http://dx.doi.org/10.1117/12.951065.

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Bodala, Indu P., Yu Ke, Hasan Mir, Nitish V. Thakor, and Hasan Al-Nashash. "Cognitive workload estimation due to vague visual stimuli using saccadic eye movements." In 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2014. http://dx.doi.org/10.1109/embc.2014.6944252.

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Xiaoshuai Sun, Hongxun Yao, and Rongrong Ji. "What are we looking for: Towards statistical modeling of saccadic eye movements and visual saliency." In 2012 IEEE Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2012. http://dx.doi.org/10.1109/cvpr.2012.6247846.

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Niknam, Kaiser, Amir Akbarian, Behrad Noudoost, and Neda Nategh. "Model-based decoding of time-varying visual information during saccadic eye movements using population-level information." In 2017 51st Asilomar Conference on Signals, Systems, and Computers. IEEE, 2017. http://dx.doi.org/10.1109/acssc.2017.8335604.

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Roy, Manish, Amir Akbarian, Behrad Noudoost, and Neda Nategh. "The Population Map of Changes in the Spatiotemporal Sensitivity of Visual Neurons Across Saccadic Eye Movements." In 2020 54th Asilomar Conference on Signals, Systems, and Computers. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf51394.2020.9443422.

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Antonya, Csaba, Florin Barbuceanu, Zolta´n Rusa´k, Doru Talaba, Silviu Butnariu, and Hunor Erde´lyi. "Obstacle Avoidance in Simulated Environment Using Eye Tracking Technologies." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87149.

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The paper is investigating the relationship between human eye movements, correlated with the visual perception of computer generated scene on one hand and obstacle avoidance strategies on the other hand, during the process of driving a computer game-like car. Several issues were investigated regarding how the gaze fixation point of the driver is moving during obstacle avoidance maneuvers. The relevance of each issue in making a decision was assessed. The main goal is to establish a correlation (mapping) system between gaze fixation parameters and obstacles avoidance strategies in order to be able to develop cognitive algorithms for driver assistance in real world driving conditions, to monitor driver’s vigilance and ultimately to enable progress towards the autonomous vehicle which can avoid possible obstacles or resolve hazardous traffic situations just by monitoring the eye movements of the driver.
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Varela, Victor P. L., Estela Ribeiro, Pedro A. S. S. Orona, and Carlos E. Thomaz. "Eye movements and human face perception: An holistic analysis and proficiency classification based on frontal 2D face images." In XV Encontro Nacional de Inteligência Artificial e Computacional. Sociedade Brasileira de Computação - SBC, 2018. http://dx.doi.org/10.5753/eniac.2018.4403.

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Human faces convey a collection of information, such as gender, identity, and emotional states. Therefore, understanding the differences between volunteers’ eye movements on benchmark tests of face recognition and perception can explicitly indicate the most discriminating regions to improve performance in this visual cognitive task. The aim of this work is to qualify and classify these eye strategies using multivariate statistics and machine learning techniques, achieving up to 94.8% accuracy. Our experimental results show that volunteers have focused their visual attention, on average, at the eyes, but those with superior performance in the tests carried out have looked at the nose region more closely.
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