Author: Guy A. OrbanPublisher:
ISBN:
Category :
Languages : en
Pages : 222
Book Description
Visual Cortical Mechanisms of Movement Perception
Author: Guy A. OrbanVisual Cortical Mechanisms of Motion Perception and Navigation
Author: Christopher PackPublisher:
ISBN:
Category : Motion perception (Vision)
Languages : en
Pages : 248
Book Description
Brain Mechanisms and Spatial Vision
Author: D.J. InglePublisher: Springer Science & Business Media
ISBN: 9400950713
Category : Psychology
Languages : en
Pages : 486
Book Description
This volume contains chapters derived from a N. A. T. O. Advanced Study Institute held in June 1983. As the director of this A. S. I. it was my hope that some of the e1ectrophysiologists could express the potentialities of their work for perceptual theory, and that some perceptionists could speculate on the underlying "units" of perception in a way that would engage the imagination of physio logists. The reader will have to be the judge of whether this was achieved, or whether such a psychophysiological inter1ingua is still overly idealistic. It is clear that after the revolution prec~pitated by Hube1 and Weisel in understanding of visual cortical neurons we still have only a foggy idea of the behavioral output of any particular species of cortical detector. It was therefore particularly unfortunate that two persons who have made great strides in correlating interesting facets of cat cortical physio logy with human psychophysics (Max Cynader and Martin Regan of Dalhousie University) were unable to attend this meeting. Never theless, a number of new and challenging ideas regarding both spatial perception and cortical mechanisms are represented in this volume, and it is hoped that the reader will remember not only the individual demonstrations but the critical questions posed by the apposition of the two different collections of experimental facts. David Ingle April 1984 VII TABLE OF CONTENTS PREFACE V D. N. Lee and D. S. Young Visual Timing of Interceptive Action 1 J. J.
Dynamics of Visual Motion Processing
Author: Guillaume S. MassonPublisher: Springer Science & Business Media
ISBN: 1441907815
Category : Medical
Languages : en
Pages : 362
Book Description
Motion processing is an essential piece of the complex brain machinery that allows us to reconstruct the 3D layout of objects in the environment, to break camouflage, to perform scene segmentation, to estimate the ego movement, and to control our action. Although motion perception and its neural basis have been a topic of intensive research and modeling the last two decades, recent experimental evidences have stressed the dynamical aspects of motion integration and segmentation. This book presents the most recent approaches that have changed our view of biological motion processing. These new experimental evidences call for new models emphasizing the collective dynamics of large population of neurons rather than the properties of separate individual filters. Chapters will stress how the dynamics of motion processing can be used as a general approach to understand the brain dynamics itself.
Cortical Mechanisms of Vision
Author: Michael JenkinPublisher: Cambridge University Press
ISBN: 0521889618
Category : Medical
Languages : en
Pages : 459
Book Description
The advent of sensors capable of localizing portions of the brain involved in specific computations has provided significant insights into normal visual information processing and specific neurological conditions. Aided by devices such as fMRI, researchers are now able to construct highly detailed models of how the brain processes specific patterns of visual information. This book brings together some of the strongest thinkers in this field, to explore cortical visual information processing and its underlying mechanisms. It is an excellent resource for vision researchers with both biological and computational backgrounds, and is an essential guide for graduate students just starting out in the field.
Visual Perception
Author: Vicki BrucePublisher: Psychology Press
ISBN: 1136917071
Category : Psychology
Languages : en
Pages : 496
Book Description
This comprehensively updated and expanded revision of the successful second edition continues to provide detailed coverage of the ever-growing range of research topics in vision. In Part I, the treatment of visual physiology has been extensively revised with an updated account of retinal processing, a new section explaining the principles of spatial and temporal filtering which underlie discussions in later chapters, and an up-to-date account of the primate visual pathway. Part II contains four largely new chapters which cover recent psychophysical evidence and computational model of early vision: edge detection, perceptual grouping, depth perception, and motion perception. The models discussed are extensively integrated with physiological evidence. All other chapters in Parts II, III, and IV have also been thoroughly updated.
Neural Mechanisms of Color Vision
Author: Bevil Richard ConwayPublisher: Springer Science & Business Media
ISBN: 1475759533
Category : Medical
Languages : en
Pages : 155
Book Description
Dr. Conway mapped the spatial and temporal structure of the cone inputs to single neurons in the primary visual cortex of the alert macaque. Color cells had receptive fields that were often Double-Opponent, an organization of spatial and chromatic opponency sufficient to form the basis for color constancy and spatial color contrast. Almost all color cells gave a bigger response to color when preceded by an opposite color, suggesting that these cells also encode temporal color contrast. In sum, color perception is likely subserved by a subset of specialized neurons in the primary visual cortex. These cells are distinct from those that likely underlie form and motion perception. Color cells establish three color axes sufficient to describe all colors; moreover these cells are capable of computing spatial and temporal color contrast - and probably contribute to color constancy computations - because the receptive fields of these cells show spatial and temporal chromatic opponency.
Vision and Movement
Author: Visual Perception Part 1
Author: Susana Martinez-CondePublisher: Elsevier
ISBN: 0080466087
Category : Psychology
Languages : en
Pages : 341
Book Description
This book presents a collection of articles reflecting state-of-the-art research in visual perception, specifically concentrating on neural correlates of perception. Each section addresses one of the main topics in vision research today. Volume 1 Fundamentals of Vision: Low and Mid-Level Processes in Perception covers topics from receptive field analyses to shape perception and eye movements. A variety of methodological approaches are represented, including single-neuron recordings, fMRI and optical imaging, psychophysics, eye movement characterization and computational modelling. The contributions will provide the reader with a valuable perspective on the current status of vision research, and more importantly, with critical insight into future research directions and the discoveries yet to come. · Provides a detailed breakdown of the neural and psychophysical bases of Perception · Presents never-before-published original discoveries · Includes multiple full-color illustrations
Inhibitory Mechanisms in Visual Motion Perception
Author: Sandra Arranz ParaísoPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The world around us is constantly changing, with multiple objects in the environment changing position, luminance, and color. These objects can also move on static or in motion backgrounds, with the same or different speed, in opposite direction, etc. Our Visual System can segregate figures from the background and thus extract information about objects in complex environments. Understanding how humans process motion is one of the most relevant and sophisticated problems in visual perception (see review of Nishida, 2011). The functional characteristics of the underlying mechanisms are not completely known, in particular, the role of the inhibitory mechanisms in motion perception. Therefore, the main goal of this Thesis is the psychophysical characterization of the functional properties of two inhibitory mechanisms involved in visual motion perception. It has traditionally been proposed that the antagonistic center-surround mechanisms are implicated in the segregation of the figure from the background (Lappin & Tadin, 2004;Tadin et al., 2019). The normal functioning of these mechanisms causes difficulties in perceiving large moving objects at high contrast (Derrington & Goddard, 1989). However, at low contrast, the larger the size of the object, the easier it is to detect its motion (Tadin etal., 2003). To explain these results, it is assumed that in these mechanisms, when the stimulus is large and has high contrast, the peripheral region suppresses or inhibits the activation of the center, and for low contrast, it facilitates the activation of the center. The same results have been found by analyzing the response of neurons with antagonistic center-surround receptive fields present in the medial temporal (MT) area of the visual cortex (Pack, Hunter & Born, 2005) and in the medial superior temporal (MST) area (Eifuku & Wurtz, 1998). The shape of these receptive fields is not fully characterized, although recent studies suggest an elongated spatial configuration in the direction of movement (Serrano-Pedraza, Hogg & Read, 2011), in agreement with physiological evidence (Xiao et al., 1997)...