Download or read book Exploring Mechanisms for Contextual Modulation in V1 written by Matthew P. Whitmire and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The brain can quickly take complex visual information in a scene and group together or distinguish relevant features, allowing us to seamlessly interpret and interact with the world around us. Evidence from recordings in visual cortex have shown that neurons not only responsive to stimuli within their receptive field, but also sensitive to stimuli in the surrounding area. This effect is referred to as contextual modulation. The primary visual cortex (V1) represents high resolution spatial information and stands as the bottleneck before all other visual processing in the cortex, making it a prime location to study complex mechanisms for sensory encoding, like contextual modulation. This dissertation investigates contextual modulation mechanisms present in V1 by: 1) testing if the large-scale population activity in V1 contributes to contour grouping while a monkey is engaged in a complex and difficult contour detection task, and 2) comparing how excitatory and inhibitory cell populations in V1 contribute to orientation tuning, size tuning, and surround modulation effects. First, I will show that we can train rhesus macaques to reliably perform a complex contour detection task with stimuli based on the statistics of contours found in natural scenes. Next, I will demonstrate that when recording voltage sensitive dye imaging signals during the contour detection task, V1 does not show evidence of participating in the contour grouping computation. This suggests V1 may only relay information from individual elements, which are then grouped together in subsequent visual areas. Continuing, I will present that inhibitory cells in macaque V1 show orientation tuning and orientation maps with broader tuning than excitatory cells. Then, I will demonstrate that inhibitory and excitatory size tuning and receptive field sizes do not differ substantially and that V1 surround modulation may be sensitive to general discontinuity, rather than only orientation difference. These results do not support key models of inhibition during size tuning effects and open the field to more work comparing contextual modulation effects across excitatory and inhibitory cells in macaque. Overall, this thesis challenges widely held models of contextual modulation in V1, both for contour grouping and how inhibition shapes surround modulation effects

Download or read book Exploring Robotic Minds written by Jun Tani and published by Oxford University Press. This book was released on 2017 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: How do 'minds' work? In 'Exploring Robotic Minds', Jun Tani answers this fundamental question by reviewing his own pioneering neurorobotics research project.

Download or read book Computational and Psychophysical Mechanisms of Visual Coding written by Michael Jenkin and published by Cambridge University Press. This book was released on 1997-05-13 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: All visual tasks, from the simplest computer graphics program to the most complex biological visual system, require an underlying representation of visual information. The structure or coding of this representation provides the framework for processing the information. Both the biological and computational communities have had to address the task of designing or inferring visual coding strategies. This volume, by some of the most active contributors in the field of visual coding, describes some of the mechanisms used to code descriptions of visual phenomena in both areas. These chapters illustrate the similarities in the problems considered and the common models and algorithms that are proposed to solve them. The book includes an overview that sets the later chapters in context. Researchers in neuroscience and computational vision will find a wealth of new ideas here.

Download or read book Micro Meso and Macro Dynamics of the Brain written by György Buzsáki and published by Springer. This book was released on 2016-05-02 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together leading investigators who represent various aspects of brain dynamics with the goal of presenting state-of-the-art current progress and address future developments. The individual chapters cover several fascinating facets of contemporary neuroscience from elementary computation of neurons, mesoscopic network oscillations, internally generated assembly sequences in the service of cognition, large-scale neuronal interactions within and across systems, the impact of sleep on cognition, memory, motor-sensory integration, spatial navigation, large-scale computation and consciousness. Each of these topics require appropriate levels of analyses with sufficiently high temporal and spatial resolution of neuronal activity in both local and global networks, supplemented by models and theories to explain how different levels of brain dynamics interact with each other and how the failure of such interactions results in neurologic and mental disease. While such complex questions cannot be answered exhaustively by a dozen or so chapters, this volume offers a nice synthesis of current thinking and work-in-progress on micro-, meso- and macro- dynamics of the brain.

Download or read book Brain and Visual Perception written by David H. Hubel M.D. and published by Oxford University Press. This book was released on 2004-10-14 with total page 739 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the story of a hugely successful and enjoyable 25-year collaboration between two scientists who set out to learn how the brain deals with the signals it receives from the two eyes. Their work opened up a new area of brain research that led to their receiving the Nobel Prize in 1981. The book contains their major papers from 1959 to 1981, each preceded and followed by comments telling how and why the authors went about the study, how the work was received, and what has happened since. It begins with short autobiographies of both men, and describes the state of the field when they started. It is intended not only for neurobiologists, but for anyone interested in how the brain works-biologists, psychologists, philosophers, physicists, historians of science, and students at all levels from high school to graduate level.

Download or read book Cognitive Neuroscience written by Michael D. Rugg and published by Psychology Press. This book was released on 2013-04-15 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing up-to-date and authoritative coverage of key topics in the new discipline of cognitive neuroscience, this book will be essential reading in cognitive psychology, neuropsychology and neurophysiology. Striking a balance between theoretical and empirical approaches to the question of how cognition is supported by the brain, it presents the major experimental methods employed by cognitive neuroscientists and covers a representative range of the subjects currently exciting interest in the field. The nine chapters of the book have been written by leading authorities in their fields. The individual chapters provide "state-of-the-art" reviews of their respective attempts to build bridges between domains of enquiry that, until quite recently, were largely independent of one another. The chapters include two describing the different methods that are now available for non-invasive measurement of human brain activity; another two that discuss various current theoretical approaches to the problem of how information is coded in the nervous system; and single contributions dealing with the neural mechanisms of long-term memory and of movement, the functional and neural architecture of working memory, the organization of language in the brain, and the relationship between perception and consciousness. Cognitive Neuroscience will appeal to advanced undergraduate and graduate students interested in the relationship between the brain and higher mental functions, as well as to established researchers in cognitive neuroscience and related fields.

Download or read book Dynamic Coordination in the Brain written by Christoph Von Der Malsburg and published by MIT Press. This book was released on 2010-07-09 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: An examination of how widely distributed and specialized activities of the brain are flexibly and effectively coordinated. A fundamental shift is occurring in neuroscience and related disciplines. In the past, researchers focused on functional specialization of the brain, discovering complex processing strategies based on convergence and divergence in slowly adapting anatomical architectures. Yet for the brain to cope with ever-changing and unpredictable circumstances, it needs strategies with richer interactive short-term dynamics. Recent research has revealed ways in which the brain effectively coordinates widely distributed and specialized activities to meet the needs of the moment. This book explores these findings, examining the functions, mechanisms, and manifestations of distributed dynamical coordination in the brain and mind across different species and levels of organization. The book identifies three basic functions of dynamic coordination: contextual disambiguation, dynamic grouping, and dynamic routing. It considers the role of dynamic coordination in temporally structured activity and explores these issues at different levels, from synaptic and local circuit mechanisms to macroscopic system dynamics, emphasizing their importance for cognition, behavior, and psychopathology. Contributors Evan Balaban, György Buzsáki, Nicola S. Clayton, Maurizio Corbetta, Robert Desimone, Kamran Diba, Shimon Edelman, Andreas K. Engel, Yves Fregnac, Pascal Fries, Karl Friston, Ann Graybiel, Sten Grillner, Uri Grodzinski, John-Dylan Haynes, Laurent Itti, Erich D. Jarvis, Jon H. Kaas, J.A. Scott Kelso, Peter König, Nancy J. Kopell, Ilona Kovács, Andreas Kreiter, Anders Lansner, Gilles Laurent, Jörg Lücke, Mikael Lundqvist, Angus MacDonald, Kevan Martin, Mayank Mehta, Lucia Melloni, Earl K. Miller, Bita Moghaddam, Hannah Monyer, Edvard I. Moser, May-Britt Moser, Danko Nikolic, William A. Phillips, Gordon Pipa, Constantin Rothkopf, Terrence J. Sejnowski, Steven M. Silverstein, Wolf Singer, Catherine Tallon-Baudry, Roger D. Traub, Jochen Triesch, Peter Uhlhaas, Christoph von der Malsburg, Thomas Weisswange, Miles Whittington, Matthew Wilson

Download or read book 20 Years of Computational Neuroscience written by James M Bower and published by Springer Science & Business Media. This book was released on 2013-07-11 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: When funding agencies and policy organizations consider the role of modeling and simulation in modern biology, the question is often posed, what has been accomplished ? This book will be organized around a symposium on the 20 year history of the CNS meetings, to be held as part of CNS 2010 in San Antonio Texas in July 2010. The book, like the symposium is intended to summarize progress made in Computational Neuroscience over the last 20 years while also considering current challenges in the field. As described in the table of contents, the chapter’s authors have been selected to provide wide coverage of the applications of computational techniques to a broad range of questions and model systems in neuroscience. The proposed book will include several features that establish the history of the field. For each article, its author will select an article originally appearing in a CNS conference proceedings from 15 – 20 years ago. These short (less than 6 page) articles will provide illustrations of the state of the field 20 years ago. The new articles will describe what has been learned about the subject in the following 20 years, and pose specific challenges for the next 20 years. The second historical mechanism will be the reproduction of the first 12 years of posters from the CNS meeting. These posters in and of themselves have become famous in the field (they hang in the halls of the NIH in Bethesda Maryland) and were constructed as allegories for the state and development of computational neuroscience. The posters were designed by the book’s editor, who will, for the first time, provide a written description of each poster.

Download or read book Inhibitory Synaptic Plasticity written by Melanie A. Woodin and published by Springer Science & Business Media. This book was released on 2010-11-02 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume will explore the most recent findings on cellular mechanisms of inhibitory plasticity and its functional role in shaping neuronal circuits, their rewiring in response to experience, drug addiction and in neuropathology. Inhibitory Synaptic Plasticity will be of particular interest to neuroscientists and neurophysiologists.

Download or read book Micro Meso and Macro Connectomics of the Brain written by Henry Kennedy and published by Springer. This book was released on 2016-03-10 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has brought together leading investigators who work in the new arena of brain connectomics. This includes ‘macro-connectome’ efforts to comprehensively chart long-distance pathways and functional networks; ‘micro-connectome’ efforts to identify every neuron, axon, dendrite, synapse, and glial process within restricted brain regions; and ‘meso-connectome’ efforts to systematically map both local and long-distance connections using anatomical tracers. This book highlights cutting-edge methods that can accelerate progress in elucidating static ‘hard-wired’ circuits of the brain as well as dynamic interactions that are vital for brain function. The power of connectomic approaches in characterizing abnormal circuits in the many brain disorders that afflict humankind is considered. Experts in computational neuroscience and network theory provide perspectives needed for synthesizing across different scales in space and time. Altogether, this book provides an integrated view of the challenges and opportunities in deciphering brain circuits in health and disease.

Download or read book Visual Attention Mechanisms written by Virginio Cantoni and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Fifth International School on Neural Networks "E.R. Caianiello" on Visual Attention MechaProceedings of the Fifth International School on Neural Networks "E.R. Caianiello" on Visual Attention Mechanisms, held 23-28 October 2000 in Vietri sul Mare, Italy.nisms, held 23-28 October 2000 in Vietri sul Mare, Italy. The book covers a number of broad themes relevant to visual attention, ranging from computer vision to psychology and physiology of vision. The main theme of the book is the attention processes of vision systems and it aims to point out the analogies and the divergences of biological vision with the frameworks introduced by computer scientists in artificial vision.

Download or read book Filling In written by Luiz Pessoa and published by Oxford University Press. This book was released on 2003-02-27 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The best example of filling-in involves the blind spot, a region of the retina devoid of photoreceptors. Remarkably, the region of visual space corresponding to the blind spot is not perceived as a dark region in space, but instead as having the same color and texture as the surrounding background; hence the expression "filling in." While this type of perceptual completion phenomenon is common in the visual domain, it is argued by the leading scientists who contribute to this book that forms of filling-in also take place in other sensory modalities, including the auditory, somatosensory, and motor systems. In a concluding chapter an integrative approach is taken, which attempts to provide a common framework for completion phenomena occurring on a fast time scale, and cortical reorganization in sensory and motor cortex induced by peripheral damage or skill learning taking place on a slower time scale. It is proposed that systematic changes in the interplay between inhibitory and excitatory inputs permit cortical neurons to become driven by new sources of input, which, in addition to initial perceptual consequences can lead to a long-term structural reorganization of cortex. This book represents a truly interdisciplinary approach to neuroscience, with chapters covering computational modeling, visual psychophysics, functional brain imaging, single-cell physiology, and clinical patient cases. It will be of interest to researchers and graduate students in systems neuroscience, cognitive neuroscience, vision science, neuroimaging, perceptual psychology, computational neuroscience, and philosophy of mind.

Download or read book Perceptual Learning written by Manfred Fahle and published by MIT Press. This book was released on 2002 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perceptual learning is the specific and relatively permanent modification of perception and behaviour following sensory experience. This book presents advances made during the 1990s in this rapidly growing field.

Download or read book An Introduction to the Event Related Potential Technique second edition written by Steven J. Luck and published by MIT Press. This book was released on 2014-05-30 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential guide to designing, conducting, and analyzing event-related potential (ERP) experiments, completely updated for this edition. The event-related potential (ERP) technique, in which neural responses to specific events are extracted from the EEG, provides a powerful noninvasive tool for exploring the human brain. This volume describes practical methods for ERP research along with the underlying theoretical rationale. It offers researchers and students an essential guide to designing, conducting, and analyzing ERP experiments. This second edition has been completely updated, with additional material, new chapters, and more accessible explanations. Freely available supplementary material, including several online-only chapters, offer expanded or advanced treatment of selected topics. The first half of the book presents essential background information, describing the origins of ERPs, the nature of ERP components, and the design of ERP experiments. The second half of the book offers a detailed treatment of the main steps involved in conducting ERP experiments, covering such topics as recording the EEG, filtering the EEG and ERP waveforms, and quantifying amplitudes and latencies. Throughout, the emphasis is on rigorous experimental design and relatively simple analyses. New material in the second edition includes entire chapters devoted to components, artifacts, measuring amplitudes and latencies, and statistical analysis; updated coverage of recording technologies; concrete examples of experimental design; and many more figures. Online chapters cover such topics as overlap, localization, writing and reviewing ERP papers, and setting up and running an ERP lab.

Download or read book Visual Perception Part 2 written by Susana Martinez-Conde and published by Elsevier. This book was released on 2006-10-06 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. Part 2: Fundamentals of Awareness, Multi-Sensory Integration and High-Order Perception covers topics from filling-in to visual awareness to crossmodal interactions. 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

Download or read book Neural Computation written by and published by . This book was released on 2005 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neural Mechanisms written by Fabrizio Calzavarini and published by Springer Nature. This book was released on 2020-12-02 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume brings together new papers advancing contemporary debates in foundational, conceptual, and methodological issues in cognitive neuroscience. The different perspectives presented in each chapter have previously been discussed between the authors, as the volume builds on the experience of Neural Mechanisms (NM) Online – webinar series on the philosophy of neuroscience organized by the editors of this volume. The contributed chapters pertain to five core areas in current philosophy of neuroscience. It surveys the novel forms of explanation (and prediction) developed in cognitive neuroscience, and looks at new concepts, methods and techniques used in the field. The book also highlights the metaphysical challenges raised by recent neuroscience and demonstrates the relation between neuroscience and mechanistic philosophy. Finally, the book dives into the issue of neural computations and representations. Assembling contributions from leading philosophers of neuroscience, this work draws upon the expertise of both established scholars and promising early career researchers.