Contextual Modulations Of Visual Perception And Visual Cortex Activity In Humans
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Contextual Modulations Of Visual Perception And Visual Cortex Activity In Humans
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Author : B. de Haas
language : en
Publisher:
Release Date : 2014
Contextual Modulations Of Visual Perception And Visual Cortex Activity In Humans written by B. de Haas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Contextual Modulations Of Visual Perception And Visual Cortex Activity In Humans
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Author : Benjamin De Haas
language : en
Publisher:
Release Date : 2014
Contextual Modulations Of Visual Perception And Visual Cortex Activity In Humans written by Benjamin De Haas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
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.
Modulation Of Neuronal Responses
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Author : Giedrius T. Buračas
language : en
Publisher:
Release Date : 2003
Modulation Of Neuronal Responses written by Giedrius T. Buračas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Brain categories.
The unique feature that distinguishes this volume from a number of others addressing neural basis of visual perception and visual attention is that it contains a set of advanced-tutorial chapters that deal with neural modulatory mechanisms at multiple levels of the brain organization in the context of active vision. These chapters encompass modulatory mechanisms starting with the modulation at the level of single neurons (e.g. the level of synaptic transmission), through the level of neuronal ensembles (e.g. population codes), and ending with the modulations due to the behavioral states. The book is organized as follows. The first section begins with the modulatory arousal mechanisms of the midbrain and the basal forebrain that influence the character of neuronal responses to visual stimuli in both cortex and thalamus. Even short-lived transient changes in the state of arousal are shown to affect the coding of visual information. The second section focuses on the contextual mechanisms that determine integration of visual information in the visual cortex based on the prior knowledge about the structure of the environment and the attention/intention mechanisms that endow representations of visual information with behavioral relevance. Selective attention is shown to determine the extent of contextual influences on perception and neuronal responses in the visual cortex. Cortico-cortical feedback connections are proposed to be critical in supporting this modulation of contextual influences. The third section explores neuronal codes that satisfy informational and temporal constraints set by rapidly unfolding behaviors associated with active vision. Finally, the fourth section is dedicated to the issues of correlating measures of perception and behavior with underlying neuronal responses. We believe this volume will offer for interested readers a unique integrated perspective on how modulatory mechanisms at different levels of cerebral or
Cognitive Modulations Of Early Visual Cortex Activity In Humans
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Author : Karsten Rauss
language : en
Publisher:
Release Date : 2010
Cognitive Modulations Of Early Visual Cortex Activity In Humans written by Karsten Rauss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Visual Cortex
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Author : Stephane Molotchnikoff
language : en
Publisher: BoD – Books on Demand
Release Date : 2012-09-26
Visual Cortex written by Stephane Molotchnikoff and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-26 with Medical categories.
The neurosciences have experienced tremendous and wonderful progress in many areas, and the spectrum encompassing the neurosciences is expansive. Suffice it to mention a few classical fields: electrophysiology, genetics, physics, computer sciences, and more recently, social and marketing neurosciences. Of course, this large growth resulted in the production of many books. Perhaps the visual system and the visual cortex were in the vanguard because most animals do not produce their own light and offer thus the invaluable advantage of allowing investigators to conduct experiments in full control of the stimulus. In addition, the fascinating evolution of scientific techniques, the immense productivity of recent research, and the ensuing literature make it virtually impossible to publish in a single volume all worthwhile work accomplished throughout the scientific world. The days when a single individual, as Diderot, could undertake the production of an encyclopedia are gone forever. Indeed most approaches to studying the nervous system are valid and neuroscientists produce an almost astronomical number of interesting data accompanied by extremely worthy hypotheses which in turn generate new ventures in search of brain functions. Yet, it is fully justified to make an encore and to publish a book dedicated to visual cortex and beyond. Many reasons validate a book assembling chapters written by active researchers. Each has the opportunity to bind together data and explore original ideas whose fate will not fall into the hands of uncompromising reviewers of traditional journals. This book focuses on the cerebral cortex with a large emphasis on vision. Yet it offers the reader diverse approaches employed to investigate the brain, for instance, computer simulation, cellular responses, or rivalry between various targets and goal directed actions. This volume thus covers a large spectrum of research even though it is impossible to include all topics in the extremely diverse field of neurosciences.
Human Neurophysiological Mechanisms Of Contextual Modulation In Primary Visual Cortex
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Author : Jennifer Frances Schumacher
language : en
Publisher:
Release Date : 2010
Human Neurophysiological Mechanisms Of Contextual Modulation In Primary Visual Cortex written by Jennifer Frances Schumacher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Higher Order Processing In The Visual System
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Author : Gregory R. Bock
language : en
Publisher: John Wiley & Sons
Release Date : 2008-04-30
Higher Order Processing In The Visual System written by Gregory R. Bock and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-30 with Psychology categories.
Foremost neurophysiologists and psychophysicists provide pertinent information on the nature of representation at the earliest stages as this will constrain the disposition of all subsequent processing. This processing is discussed in several different types of visual perception.
Feedforward And Feedback Processes In Vision
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Author : Hulusi Kafaligonul
language : en
Publisher: Frontiers Media SA
Release Date : 2015-07-10
Feedforward And Feedback Processes In Vision written by Hulusi Kafaligonul and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-10 with Feedback categories.
The visual system consists of hierarchically organized distinct anatomical areas functionally specialized for processing different aspects of a visual object (Felleman & Van Essen, 1991). These visual areas are interconnected through ascending feedforward projections, descending feedback projections, and projections from neural structures at the same hierarchical level (Lamme et al., 1998). Accumulating evidence from anatomical, functional and theoretical studies suggests that these three projections play fundamentally different roles in perception. However, their distinct functional roles in visual processing are still subject to debate (Lamme & Roelfsema, 2000). The focus of this Research Topic is the roles of feedforward and feedback projections in vision. Even though the notions of feedforward, feedback, and reentrant processing are widely accepted, it has been found difficult to distinguish their individual roles on the basis of a single criterion. We welcome empirical contributions, theoretical contributions and reviews that fit into any one (or a combination) of the following domains: 1) their functional roles for perception of specific features of a visual object 2) their contributions to the distinct modes of visual processing (e.g., pre-attentive vs. attentive, conscious vs. unconscious) 3) recent techniques/methodologies to identify distinct functional roles of feedforward and feedback projections and corresponding neural signatures. We believe that the current Research Topic will not only provide recent information about feedforward/feedback processes in vision but also contribute to the understanding fundamental principles of cortical processing in general.
On The Knowledge Of Distance Given By Binocular Vision
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Author : David Brewster
language : en
Publisher:
Release Date : 1844
On The Knowledge Of Distance Given By Binocular Vision written by David Brewster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1844 with Binoculars categories.