Fixational Eye Movements
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Microsaccades
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Author : Bettenbühl, Mario
language : en
Publisher: Universitätsverlag Potsdam
Release Date : 2015-12-15
Microsaccades written by Bettenbühl, Mario and has been published by Universitätsverlag Potsdam this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-15 with Mathematics categories.
The first thing we do upon waking is open our eyes. Rotating them in our eye sockets, we scan our surroundings and collect the information into a picture in our head. Eye movements can be split into saccades and fixational eye movements, which occur when we attempt to fixate our gaze. The latter consists of microsaccades, drift and tremor. Before we even lift our eye lids, eye movements – such as saccades and microsaccades that let the eyes jump from one to another position – have partially been prepared in the brain stem. Saccades and microsaccades are often assumed to be generated by the same mechanisms. But how saccades and microsaccades can be classified according to shape has not yet been reported in a statistical manner. Research has put more effort into the investigations of microsaccades’ properties and generation only since the last decade. Consequently, we are only beginning to understand the dynamic processes governing microsaccadic eye movements. Within this thesis, the dynamics governing the generation of microsaccades is assessed and the development of a model for the underlying processes. Eye movement trajectories from different experiments are used, recorded with a video-based eye tracking technique, and a novel method is proposed for the scale-invariant detection of saccades (events of large amplitude) and microsaccades (events of small amplitude). Using a time-frequency approach, the method is examined with different experiments and validated against simulated data. A shape model is suggested that allows for a simple estimation of saccade- and microsaccade related properties. For sequences of microsaccades, in this thesis a time-dynamic Markov model is proposed, with a memory horizon that changes over time and which can best describe sequences of microsaccades.
Microsaccades
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Author : Mario Bettenbühl
language : en
Publisher:
Release Date : 2012
Microsaccades written by Mario Bettenbühl and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Fixational Eye Movements
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Author : Anna-Katharina Hauperich
language : en
Publisher:
Release Date : 2019
Fixational Eye Movements written by Anna-Katharina Hauperich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
The Roles Of Fixational Eye Movements In Visual Perception
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Author : Moshe Fried
language : en
Publisher:
Release Date : 2008
The Roles Of Fixational Eye Movements In Visual Perception written by Moshe Fried and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
The Role Of Fixational Eye Movements In Foveal Spatio Temporal Vision
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Author : Rick Lee Phillips
language : en
Publisher:
Release Date : 1985
The Role Of Fixational Eye Movements In Foveal Spatio Temporal Vision written by Rick Lee Phillips and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Eye categories.
Eye Movements And Their Role In Visual And Cognitive Processes
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Author : Eileen Kowler
language : en
Publisher: Elsevier Publishing Company
Release Date : 1990
Eye Movements And Their Role In Visual And Cognitive Processes written by Eileen Kowler and has been published by Elsevier Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Medical categories.
This is the first book to deal exclusively with oculomotor performance in a series that, up to this point, has been devoted largely to reviews of research on oculomotor anatomy and physiology. The publication of this volume signifies the recognition of the fact that a genuine understanding of eye movement will not come about through the study of neurons alone. We need to know about the capacity to make different kinds of eye movement, and about how such oculomotor capacity is used to accomplish different sorts of visual and cognitive tasks, i.e. how the eye can move and why it moves in particular ways. Research on respective topics was critically evaluated by the contributing authors, resulting in a controversial and up-to-date appraisal of this subject.
Eye Movement Research
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Author : Christoph Klein
language : en
Publisher: Springer Nature
Release Date : 2019-10-16
Eye Movement Research written by Christoph Klein and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-16 with Psychology categories.
This edited volume presents fundamentals as well as applications of oculomotor methods in industrial and clinical settings. The topical spectrum covers 1.) basics and background material, 2.) methods such as recording techniques, markov models, Lévy flights, pupillometry and many more, as well as 3.) a broad range of applications in clinical and industrial settings. The target audience primarily comprises research experts and practitioners, but the book may also be beneficial for graduate students.
Eye Movement
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Author : Dominic P. Anderson
language : en
Publisher: Nova Biomedical Books
Release Date : 2011
Eye Movement written by Dominic P. Anderson and has been published by Nova Biomedical Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Eye categories.
Eye movements are a key factor in human vision. During steady state fixation where the visual attention is voluntarily centered on a fixation estimulous, the eye shows involuntary small movements that exhibit an erratic trajectory. This new book describes fixational eye movements, their mathematical models, and the factors that affect fixation. Also explored, herein, is Congential Nystagmus, which is one of the diseases that affect binocular vision, reducing the visual quality of a subject, saccadic eye movements, eye movement patterns in hemispatial neglect and eye-gaze input systems used by people with severe disabilities.
The Control Of Fixational Eye Movements
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Author : Konstantin Mergenthaler
language : en
Publisher:
Release Date : 2008
The Control Of Fixational Eye Movements written by Konstantin Mergenthaler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Vision In The Presence Of Fixational Eye Movements
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Author : Gaëlle Desbordes
language : en
Publisher:
Release Date : 2007
Vision In The Presence Of Fixational Eye Movements written by Gaëlle Desbordes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Abstract: The projection of the visual scene onto the retina is never stationary---even during the brief intersaccadic periods of fixation that characterize natural viewing conditions. Psychophysical studies in which fixation was maintained for seconds or minutes suggest that small fixational eye movements are necessary to prevent visual percepts from fading. Neurophysiological studies indicate that neurons in the early visual system are sensitive to the input changes produced by fixational eye movements. However, the possible functions of fixational eye movements in natural viewing conditions have remained controversial. The role of fixational eye movements was investigated by using combined psychophysical and neural modeling approaches. In psychophysical experiments a high-precision Dual-Purkinje-Image eyetracker was used to stabilize the retinal image by compensating for fixational eye movements, in order to quantify the loss of performance experienced by human observers during a short-duration visual discrimination task. Performance was significantly lower in the absence of fixational eye movements than in their presence. Previous modeling simulations of the early visual system suggested an important role of small eye movements in the correlational structure of neural activity. The present study focuses on the temporal evolution of spatial patterns of synchronously active neurons in the primate. Macaque retinal ganglion cells with receptive fields separated by various distances were computationally modeled. Neural responses were simulated while the cell receptive fields scanned natural images following eye movements patterns recorded in human subjects. At the onset of fixation, the responses of neighboring cells were broadly correlated over several degrees of visual angle, a distance significantly larger than the size of the receptive fields. Following this initial period, non-overlapping ganglion cells in the magnocellular pathway became, on average, uncorrelated during a typical 300-ms fixation. This dynamic spatial decorrelation was highly robust, as it originated from the temporal transience of magnocellular responses, the second-order statistics of natural images, and the retinal image motion introduced by eye movements. Spatial decorrelation facilitates a more compact neural code in the information transfer to the visual cortex. These psychophysical and computational results support the view that fixational eye movements play an important role in natural viewing conditions.