Spatial And Temporal Contextual Effects In Early Visual Physiology And Visual Perception
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Spatial And Temporal Contextual Effects In Early Visual Physiology And Visual Perception
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Author : Stephanie Wissig
language : en
Publisher:
Release Date : 2012
Spatial And Temporal Contextual Effects In Early Visual Physiology And Visual Perception written by Stephanie Wissig 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.
The Effects Of Background Wavelength On Visual Perception
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Author : Hong Zhou
language : en
Publisher:
Release Date : 1994
The Effects Of Background Wavelength On Visual Perception written by Hong Zhou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
The Importance Of Spatial And Temporal Context For Visual Processing
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Author : Chris Tailby
language : en
Publisher:
Release Date : 2003
The Importance Of Spatial And Temporal Context For Visual Processing written by Chris Tailby and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Eye categories.
Spatial And Temporal Context Effects In Vision Cognition
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Author : Ingrid R. Olson
language : en
Publisher:
Release Date : 2000
Spatial And Temporal Context Effects In Vision Cognition written by Ingrid R. Olson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Space And Time In Perception And Action
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Author : Romi Nijhawan
language : en
Publisher: Cambridge University Press
Release Date : 2010-03-25
Space And Time In Perception And Action written by Romi Nijhawan and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-03-25 with Medical categories.
Brings together cutting edge experiments and theoretical treatments regarding space, time and motion in visual neuroscience and psychophysics.
Spatial Vision
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Author : Russell L. DeValois
language : en
Publisher: Oxford University Press
Release Date : 1990-08-09
Spatial Vision written by Russell L. DeValois and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-08-09 with Psychology categories.
This volume presents an integrated view of how we perceive the spatial relations in our visual world, covering anatomical, physiological, psychophysical, and perceptual aspects. The authors discuss the visual system primarily in terms of spatial frequency analysis using a linear systems approach. They review evidence supporting a local, patch-by-patch spatial frequency filtering of visual information rather than the global Fourier analysis other researchers have proposed. A separate chapter addresses the special issues surrounding color vision, and a brief, nonmathematical introduction to linear systems analysis is included for the uninitiated reader.
Parallel And Competitive Processes In Low Level Vision And Their Impact On Awareness
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Author : Rachel Denison
language : en
Publisher:
Release Date : 2013
Parallel And Competitive Processes In Low Level Vision And Their Impact On Awareness written by Rachel Denison and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Perception consists of the brain's single best interpretation of the sensory world at a given moment in time. Multiple channels of visual input - be they from the two eyes or from the many parallel visual pathways that originate as early as the retina - must be reconciled to arrive at a unified percept. The fact that this must occur in roughly real time as the visual scene changes poses special challenges and constraints. I investigated two classes of visual processes relevant for the perception of time-varying visual stimuli: prediction, with a probable neural substrate in early visual cortical areas, and parallel processing in the magnocellular (M) and parvocellular (P) pathways. In Chapters 2 and 3, I asked how prediction and parallel pathways, respectively, contribute to perceptual selection using dynamic binocular rivalry stimuli. In binocular rivalry, incompatible images presented to the two eyes result in just one of the images being selected for awareness at any given time. This bistability makes rivalry a useful tool for the study of perceptual selection. In Chapter 2, we found that predictive context in the form of an unambiguous rotating grating biased perceptual selection during subsequent rivalry towards the expected next grating in the rotation sequence, compared to an orthogonal grating. This provided evidence that a prediction-like process influences perceptual selection during rivalry between gratings, which other work has shown is likely resolved at early stages of visual processing. In Chapter 3, we studied spatial, temporal, luminance, and chromatic factors influencing perceptual selection during interocular switch rivalry. In this type of rivalry, flickering orthogonal gratings are periodically exchanged between the two eyes, resulting in either the perception of a fast, regular alternation between orthogonally oriented gratings (similar to the display presented to a single eye) or a slow, irregular alternation, a percept that requires integration across the two eyes over time. We found that stimuli biased toward the M pathway increased the prevalence of fast, regular alternations, while stimuli biased toward the P pathway increased the prevalence of slow, irregular alternations. This finding suggested that the M and P pathways can make distinct contributions to perception during binocular rivalry and led us to propose a new framework for understanding perceptual selection during interocular switch rivalry. Physiological measurement of activity in the M and P pathways can lead to greater understanding of how these pathways contribute to perceptual experience, but methods for measuring functional signals from the M and P pathways of humans have been lacking. Therefore, in Chapter 4, we developed a procedure for functionally mapping the M and P subdivisions of human LGN, the site where these pathways are most clearly segregated, using functional magnetic resonance imaging (fMRI). We observed a gradient of more M-like to more P-like responses across the LGN. Importantly, this gradient had a spatial layout consistent with known LGN anatomical organization. This new method for localizing the M and P subdivisions of the LGN provides a way forward for investigating the function of these pathways in human visual perception, in both healthy and clinical populations. In summary, prediction and parallel processing are two classes of mechanisms that contribute to perception of dynamic visual stimuli. Here we have shown how such mechanisms operating at low levels of the visual system can help resolve competition between percepts, thereby affecting the contents of visual awareness. In addition, we developed a method for the physiological study of the M and P LGN subdivisions in the human brain, which is a promising technique for the future investigation of the roles of the M and P pathways in human visual perception, among other applications.
Contextual Effects On Visual Perception
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Author :
language : en
Publisher:
Release Date : 2021
Contextual Effects On Visual Perception written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
In this thesis we improve our understanding of how contextual effects affect the activity of neurons in primary visual cortex (V1). We investigate a variety of contextual effects, starting with the position of visual stimuli on the retina. We then look at the neural traces of iconic memory in V1, and how those can be affected by adding the context of a cue. We then show that mice can perceive figures that are defined by texture patterns, and that the context of being part of a figure elicits enhanced V1 responses to identical visual stimulation. We further suggest that the contextual modulation is driven by interneurons in the cortex that modulate the responses of cells around them. Last, we investigate the effects of task-related context on visual perception in the mouse and in humans. We present further evidence that V1 is much more than a simple relay station of neural signals but encodes different forms of contextual information.
Understanding Vision
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Author : Li Zhaoping
language : en
Publisher: OUP Oxford
Release Date : 2014-05-08
Understanding Vision written by Li Zhaoping and has been published by OUP Oxford this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-08 with Medical categories.
While the field of vision science has grown significantly in the past three decades, there have been few comprehensive books that showed readers how to adopt a computional approach to understanding visual perception, along with the underlying mechanisms in the brain. Understanding Vision explains the computational principles and models of biological visual processing, and in particular, of primate vision. The book is written in such a way that vision scientists, unfamiliar with mathematical details, should be able to conceptually follow the theoretical principles and their relationship with physiological, anatomical, and psychological observations, without going through the more mathematical pages. For those with a physical science background, especially those from machine vision, this book serves as an analytical introduction to biological vision. It can be used as a textbook or a reference book in a vision course, or a computational neuroscience course for graduate students or advanced undergraduate students. It is also suitable for self-learning by motivated readers. in addition, for those with a focused interest in just one of the topics in the book, it is feasible to read just the chapter on this topic without having read or fully comprehended the other chapters. In particular, Chapter 2 presents a brief overview of experimental observations on biological vision; Chapter 3 is on encoding of visual inputs, Chapter 5 is on visual attentional selection driven by sensory inputs, and Chapter 6 is on visual perception or decoding. Including many examples that clearly illustrate the application of computational principles to experimental observations, Understanding Vision is valuable for students and researchers in computational neuroscience, vision science, machine and computer vision, as well as physicists interested in visual processes.
Interdependence Of Spatial And Temporal Judgments In Visual Perception
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Author : Yih Lerh Huang
language : en
Publisher:
Release Date : 1981
Interdependence Of Spatial And Temporal Judgments In Visual Perception written by Yih Lerh Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.