Visual Encoding in the Human Retina

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Visual Encoding in the Human Retina by : Katja Reinhard

Download or read book Visual Encoding in the Human Retina written by Katja Reinhard and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Encoding Visual Features by Parallel Ganglion Cell Initiated Pathways in the Healthy, Diseased and Artificial Retina

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Publisher : Frontiers Media SA
ISBN 13 : 2889631052
Total Pages : 115 pages
Book Rating : 4.8/5 (896 download)

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Book Synopsis Encoding Visual Features by Parallel Ganglion Cell Initiated Pathways in the Healthy, Diseased and Artificial Retina by : Béla Völgyi

Download or read book Encoding Visual Features by Parallel Ganglion Cell Initiated Pathways in the Healthy, Diseased and Artificial Retina written by Béla Völgyi and published by Frontiers Media SA. This book was released on 2019-10-16 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photons are sensed by retinal photoreceptors whose matrix-like distribution underlies the transformation of illumination patterns of the visual scene into photoreceptor activity patterns in a visuotopic fashion. Activity of neighboring photoreceptors then are compared by secondary bipolar cells to decipher information regarding luminosity- and color-contrast. Bipolar cells achieve this by comparing signals received directly from their center receptive field with those come from spatially offset surrounding receptive field areas mediated by inhibitory, sign-inverting horizontal cells. This information is ultimately sent to retinal ganglion cells, the output neurons of the retina. In addition to the excitatory bipolar cell inputs, spatial and temporal features of ganglion cell activation are robustly modified by inner retinal amacrine cells through inhibitory chemical and/or excitatory electrical synaptic inputs. Ganglion cells sample various bipolar cell subtypes in their dendritic field and utilize collected inputs to generate a spike output code on luminosity-contrast, color-contrast, object motion, background motion, motion direction, changes in background illumination in a subtype specific manner. Ganglion cells in each subtype cover the retinal surface economically, thus collective information across the population provide a feature pattern and through time a feature movie to the brain. Some of these movies are utilized for image perception, whereas others are sent to accessory visual brain centers to control eye-movement, pupil contraction or circadian entrainment. A large body of information has been revealed in the past decade regarding this field, however much of the details still remain unknown or even enigmatic, including: (i) the precise description of neural circuits that serve each ganglion cell subtype to generate a specific feature movie; (ii) the estimation of the number of various ganglion cell subtypes that partake in image forming and non-image forming signaling towards the brain; (iii) the description of changes in the inputs, morphology and signaling of retinal ganglion cells when the tissue is under stress or undergoes disease related degenerative processes; (iv) the comparison of ganglion cell classes with those of the human retina and finally, (v) the practical use of all the above information to establish retina inspired visual algorithms to suit computer, drone and/or robotic vision. Therefore, research articles in this issue were collected to touch upon each of these topics and highlight recent advances of the related field.

Circuit Mechanisms Underlying the Encoding of Ethologically Relevant Visual Stimuli in the Retina

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ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Circuit Mechanisms Underlying the Encoding of Ethologically Relevant Visual Stimuli in the Retina by : Maxwell H. Turner

Download or read book Circuit Mechanisms Underlying the Encoding of Ethologically Relevant Visual Stimuli in the Retina written by Maxwell H. Turner and published by . This book was released on 2017 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the human retina, the axons of roughly 106 retinal ganglion cells (RGCs) carry all of the information underlying visual perception and visually guided behavior. RGC computation is the last processing step before the imposition of this sensory bottleneck. Because of the importance of RGC computation for visual function and because of the accessibility of the retina to physiological investigation, RGCs are among the best studied class of early sensory neurons. Many decades of investigation using artificial visual stimuli (e.g. spots, gratings, white noise etc.) has revealed a great deal about the physiology of RGCs, the computations they can perform, and the circuitry underlying these computations. What is lacking, however, is an understanding of RGC computation and encoding during natural visual stimulation. A complete understanding of RGC function requires extending what we have learned using artificial, mostly static visual stimuli to the dynamic and spatially structured conditions that characterize natural vision. A major focus of the thesis presented here is to begin to bridge this gap. In Chapter 2 I will review some of what is known about how neural circuits in the early visual system encode naturalistic visual inputs. In Chapters 3 & 4 I will present work that connects a ubiquitous concept in early visual processing - the receptive field - to the encoding of natural visual stimuli in the retina. Classical models of the retinal ganglion cell (RGC) receptive field assume linear integration across visual space, and this assumption guides most modern day models that aim to predict RGC responses to visual stimulation. I show that spatial nonlinearities can be important for encoding spatial contrast within a natural scene. Furthermore, we can use what we know about nonlinear receptive field structure to improve models of RGCs. Finally, I show that spatial contrast encoding by RGCs can be modulated by visual context. Regardless of the stimulus being encoded, a fundamental limit to the fidelity with which sensory information can be encoded is the variability of neural responses. Repeated presentations of the same stimulus will elicit variable responses from a single neuron. Noise is a feature of neural population responses as well, and in practice it is often found that this noise is correlated within a population. In Chapter 5, I will present a strategy used by retinal circuits to minimize the effect of noise on the encoding of a behaviorally-relevant feature of the visual world - namely an object's direction of motion.

Foundations of Vision

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Publisher : Sinauer Associates, Incorporated
ISBN 13 :
Total Pages : 508 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Foundations of Vision by : Brian A. Wandell

Download or read book Foundations of Vision written by Brian A. Wandell and published by Sinauer Associates, Incorporated. This book was released on 1995 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed for students, scientists and engineers interested in learning about the core ideas of vision science, this volume brings together the broad range of data and theory accumulated in this field.

Webvision

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (53 download)

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Book Synopsis Webvision by :

Download or read book Webvision written by and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Parallel Processing in the Visual System

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Publisher : Springer Science & Business Media
ISBN 13 : 1468444336
Total Pages : 439 pages
Book Rating : 4.4/5 (684 download)

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Book Synopsis Parallel Processing in the Visual System by : Jonathan Stone

Download or read book Parallel Processing in the Visual System written by Jonathan Stone and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the mid-sixties, John Robson and Christina Enroth-Cugell, without realizing what they were doing, set off a virtual revolution in the study of the visual system. They were trying to apply the methods of linear systems analysis (which were already being used to describe the optics of the eye and the psychophysical performance of the human visual system) to the properties of retinal ganglion cells in the cat. Their idea was to stimulate the retina with patterns of stripes and to look at the way that the signals from the center and the antagonistic surround of the respective field of each ganglion cell (first described by Stephen Kuffier) interact to generate the cell's responses. Many of the ganglion cells behaved themselves very nicely and John and Christina got into the habit (they now say) of calling them I (interesting) cells. However. to their annoyance, the majority of neurons they recorded had nasty, nonlinear properties that couldn't be predicted on the basis of simple summ4tion of light within the center and the surround. These uncoop erative ganglion cells, which Enroth-Cugell and Robson at first called D (dull) cells, produced transient bursts of impulses every time the distribution of light falling on the receptive field was changed, even if the total light flux was unaltered.

From Pigments to Perception

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Publisher : Springer Science & Business Media
ISBN 13 : 1461537185
Total Pages : 475 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis From Pigments to Perception by : Arne Valberg

Download or read book From Pigments to Perception written by Arne Valberg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a NATO ARW on Advances in Understanding Visual Processes: Convergence of Neurophysiological and Psychological Evidence, held in Roros, Norway, August 6-10, 1990

The Beginnings of Visual Perception

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (633 download)

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Book Synopsis The Beginnings of Visual Perception by : John I. Yellott

Download or read book The Beginnings of Visual Perception written by John I. Yellott and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Retinal Computation

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Publisher : Elsevier
ISBN 13 : 0128198966
Total Pages : 340 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Retinal Computation by : Greg Schwartz

Download or read book Retinal Computation written by Greg Schwartz and published by Elsevier. This book was released on 2021-08-17 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Retinal Computation summarizes current progress in defining the computations performed by the retina, also including the synaptic and circuit mechanisms by which they are implemented. Each chapter focuses on a single retinal computation that includes the definition of the computation and its neuroethological purpose, along with the available information on its known and unknown neuronal mechanisms. All chapters contain end-of-chapter questions associated with a landmark paper, as well as programming exercises. This book is written for advanced graduate students, researchers and ophthalmologists interested in vision science or computational neuroscience of sensory systems. While the typical textbook's description of the retina is akin to a biological video camera, the real retina is actually the world's most complex image processing machine. As part of the central nervous system, the retina converts patterns of light at the input into a rich palette of representations at the output. The parallel streams of information in the optic nerve encode features like color, contrast, orientation of edges, and direction of motion. Image processing in the retina is undeniably complex, but as one of the most accessible parts of the central nervous system, the tools to study retinal circuits with unprecedented precision are up to the task. This book provides a practical guide and resource about the current state of the field of retinal computation. Editorial Reviews: ".this book is also a unique overview of our current understanding of the why and the how of retinal computation and there is something here for anyone with a grounding in vision science who recognises that there is more to what the retina does than. meets the eye." -- Prof Steven Dakin, New Zealand Optics, May 28, 2022. "I want to commend Dr. Schwartz for assembling this incredible resource and strongly recommend Retinal Computation to everyone who is a student of vision. The vast majority of modern topics in retina are covered yet in a fashion that is clear, and concise. The book covers the cellular and circuit basis of computations ranging from those covered by most textbooks, such as center-surround receptive field or direction selectivity , to those you probably do not associated with the retina such as "motion anticipation" and "threat detection". Each chapter is self-contained, meaning you can easily "pick and choose" the topics. A quick perusal of the chapter titles are almost certainly going to pique your interest. For example, you may know that the retina has single photon sensitivity but do you know "How many photons does it take to create a percept"? (Chapter 1). How does the retina encode texture (i.e. spatial fluctuations within the receptive field)? (Chapter 7). Is object motion sensitivity related to Direction selectivity? (Chapter 12). The list goes on. This book will also serve as a great resource for those teaching advanced undergraduate or graduate level vision courses for students with backgrounds in experimental or computational vision science. Each chapter contains what Dr. Schwartz's considers a "landmark paper" in the field, with a set of questions that can be used as a guide for reading these papers. And finally he includes programming exercises that can be easily implemented in Matlab to address basic concepts introduced in the chapter. The instructions are detailed so that even those new to Matlab will be able to implement these exercises these straightforward. It is this combination - textbook chapter + primary literature + quantitative exercises that will solidify these concepts. There are many vision science topics not covered in the book. For example, there is little on retinal disease or development. But these limitations are far outweighed by where the book succeeds. The vast majority of the book is written by Dr. Schwartz, giving it a uniformity that is welcome. Despite tackling quite modern questions where there is ongoing progress, Dr.Schwartz has extracted what are key findings that are likely to stand the test of time. And finally, it is really interesting! For those who think that the retina is "solved", think again. Retinal computations is a fantastic way for all circuit neuroscientist to learn how much computations can be achieved with very few synapses." -- Marla B. Feller, Ph. D., Paul Licht Distinguished Professor in Biological Sciences, Division of Neurobiology, Department of Molecular and Cell Biology & Helen Wills Neuroscience Institute University of California, Berkeley "This fantastic new textbook from a rising star in the field clearly and thoroughly updates our picture of what the retina computes. It is detailed enough for senior researchers but also pedagogical, providing a go-to reference for students. The illustrations within the text and for the chapter headings are both beautiful and informative." -- Stephanie E. Palmer, Ph.D., Associate Professor, Department of Organismal Biology and Anatomy, Department of Physics, University of Chicago "This book summarizes the impressive recent progress in understanding how visual computations are performed by retinal circuits. The book is an important resource not only for retinal experts, but more generally for anyone seeking to explain how the brain works at the level of neural circuits. Greg Schwartz and his co-authors have made a major contribution to the field." -- Sebastian Seung, Anthony B. Evnin '62 Professor, Neuroscience Institute and Computer Science Dept., Princeton University "This is a wonderful book from a true expert in the retina field. It is a fantastic resource for researchers, lecturers, and students alike. The book nicely covers the many facets of how the retina processes the visual input that enters the eye. Despite the richness in material, the presentation manages to stay accessible and always connects back to fundamental questions of visual processing. Each chapter by itself is a great entry point into a particular area of how the neural network of the retina deals with a specific set of visual challenges. I have thoroughly enjoyed this wonderful overview of retinal computation, served on a silver platter, and I will use the book both as background material for research and as a resource for teaching. I particularly like the sets of exercises that conclude each chapter." -- Dr. Tim Gollisch, Professor for Sensory Processing in the Retina, Department of Ophthalmology, University Medical Center Göttingen

Motion Encoding in the Salamander Retina

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Motion Encoding in the Salamander Retina by : Norma Krystyna Kühn

Download or read book Motion Encoding in the Salamander Retina written by Norma Krystyna Kühn and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detection and correct interpretation of motion in visual scenes is important in everyday tasks, e.g., for avoiding cars when crossing the street or for assessing the optic flow, induced by self-motion, when navigating through a room. The processing of visual motion starts in the retina where specialized neural circuits integrate the incoming signals and extract relevant features. Retinal ganglion cells, the output neurons of the retina, send the processed information to downstream brain areas. Here, the retinal coding of motion signals was studied in the salamander, a widely used model ...

The Effects of Cognitive State on Visual Encoding Properties in Human Cortex

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ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (19 download)

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Book Synopsis The Effects of Cognitive State on Visual Encoding Properties in Human Cortex by : Vy Ai Vo

Download or read book The Effects of Cognitive State on Visual Encoding Properties in Human Cortex written by Vy Ai Vo and published by . This book was released on 2019 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the format of neural representations is a key problem in neuroscience. I present a series of functional magnetic resonance imaging (fMRI) studies of the human visual system to investigate the format of how visual information is represented, and how the format changes due to different cognitive demands. First, I investigate how covert spatial attention modifies visual encoding properties at two different levels of analysis--at the level of a single spatial encoding unit, the receptive field, and at the level of the encoding population. Second, I examine how the contents of visual memory are represented across both working memory and long-term memory, systems that have traditionally been considered distinct entities. Together these data reveal how different retinotopic regions of visual cortex flexibly encode information about the visual world and how they are altered in response to varying cognitive demands.

Understanding Vision

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Publisher : Oxford University Press, USA
ISBN 13 : 0199564663
Total Pages : 397 pages
Book Rating : 4.1/5 (995 download)

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Book Synopsis Understanding Vision by : Li Zhaoping

Download or read book Understanding Vision written by Li Zhaoping and published by Oxford University Press, USA. This book was released on 2014 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vision science has grown hugely in the past decades, but there have been few books showing readers how to adopt a computional approach to understanding visual perception, along with the underlying mechanisms in the brain. This book explains the computational principles and models of biological visual processing, and in particular, primate vision.

How Nonlinear Processing Shapes Natural Stimulus Encoding in the Retina

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (132 download)

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Book Synopsis How Nonlinear Processing Shapes Natural Stimulus Encoding in the Retina by : Dimokratis Karamanlis

Download or read book How Nonlinear Processing Shapes Natural Stimulus Encoding in the Retina written by Dimokratis Karamanlis and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding natural vision is one of the fundamental goals of sensory neuroscience. The only part of the visual system that may currently be amenable to such a complete understanding is the vertebrate retina, where there is increasing convergence of physiological and anatomical evidence that explain the transformation from visual stimulus to neural response. A first-order approximation of retinal processing assumes that the retina acts as a parallel stream of linear filters, interfacing between the photoreceptors and the axons of retinal ganglion cells, which form the optic nerve. Computa...

Encyclopedia of the Human Brain

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Publisher : Elsevier
ISBN 13 : 0080548032
Total Pages : 3607 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Encyclopedia of the Human Brain by :

Download or read book Encyclopedia of the Human Brain written by and published by Elsevier. This book was released on 2002-07-04 with total page 3607 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, enormous strides have been made in understanding the human brain. The advent of sophisticated new imaging techniques (e.g. PET, MRI, MEG, etc.) and new behavioral testing procedures have revolutionized our understanding of the brain, and we now know more about the anatomy, functions, and development of this organ than ever before. However, much of this knowledge is scattered across scientific journals and books in a diverse group of specialties: psychology, neuroscience, medicine, etc. The Encyclopedia of the Human Brain places all information in a single source and contains clearly written summaries on what is known of the human brain. Covering anatomy, physiology, neuropsychology, clinical neurology, neuropharmacology, evolutionary biology, genetics, and behavioral science, this four-volume encyclopedia contains over 200 peer reviewed signed articles from experts around the world. The Encyclopedia articles range in size from 5-30 printed pages each, and contain a definition paragraph, glossary, outline, and suggested readings, in addition to the body of the article. Lavishly illustrated, the Encyclopedia includes over 1000 figures, many in full color. Managing both breadth and depth, the Encyclopedia is a must-have reference work for life science libraries and researchers investigating the human brain.

Research Awards Index

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ISBN 13 :
Total Pages : 1384 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Research Awards Index by :

Download or read book Research Awards Index written by and published by . This book was released on 1978 with total page 1384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Vision

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Publisher : Cambridge University Press
ISBN 13 : 9780521447690
Total Pages : 472 pages
Book Rating : 4.4/5 (476 download)

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Book Synopsis Vision by : Colin Blakemore

Download or read book Vision written by Colin Blakemore and published by Cambridge University Press. This book was released on 1993-05-13 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professor Colin Blakemore presents a fascinating insight to all the major topics in visual science research.

Research Grants Index

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ISBN 13 :
Total Pages : 1224 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Research Grants Index by : National Institutes of Health (U.S.). Division of Research Grants

Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1975 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt: