Download or read book The Role of Macaque V1 Neurons in Spatiochromatic Processing and Behavior written by Abhishek De and published by . This book was released on 2020 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vision is critical for survival. We can easily identify objects, guide actions, and avoid collisions if our eyes are open but these abilities are severely impaired if our eyes are closed. This tremendous feat of vision appears simplistic but is implemented by complex biological processes performed by the eye and brain. Therefore, a central goal in visual neuroscience is to understand how neurons in the brain represent scenes, and how the neural activity in turn helps guide behavior. Scenes are composed of spatial and chromatic variations, herein referred to as spatiochromatic variations. In the primary visual cortex (V1) of macaque monkeys, some neurons jointly analyze edges and color, making them an ideal substrate for understanding human spatiochromatic vision. Double-opponent (DO) cells in V1 respond strongly to adjacently placed lights of opposite color and weakly to spatially uniform light of one color. These properties make them well suited for processing of color across space. However, we do not know precisely what information DO cells represent and how. Understanding how DO cells function will advance the field of visual neuroscience in three ways. First, it will help us understand how DO cells are connected to other neurons, thereby shedding light on the organization of cells in V1. Second, it will help link the neuronal responses to behavioral phenomena in color vision. Third, it will advance mathematical models of visual processing that will guide research in other fields. How information about scenes is used for behavior is incomplete without understanding the link between neural activity and behavior. A mechanistic understanding of how V1 neural activity impacts visual perception will be important for understanding the role of V1 in diseases and designing brain-machine interfaces. Using a combination of electrophysiological measurements, monkey behavior and state-of-the-art techniques, I investigated the role of V1 DO cells in the spatiochromatic processing of light, and the role of V1 neural activity in visual perception. I compared my findings about DO cells to simple cells--the best understood functional cell type in V1 that represent oriented luminance edges in scenes, and integrate signals across space roughly linearly. I pursued my research in the form of three different projects, and I report the key findings from each of the projects below. In project 1, I investigated the representation of edges by DO cells. I found that DO cells represent chromatic edges the same way as simple cells represent luminance edges. In project 2, I investigated how DO cells integrate color signals across space. I found that DO cells integrate spatial signals as linearly as simple cells meaning that both these classes of neurons simply weigh and sum the incoming light to generate a spiking response. In interpreting this result, it is important to realize that linearity is not the default mode of visual neurons but rather implies a specialized wiring. My results suggest that the specialized wiring creates linear luminance edge detectors and chromatic edge detectors in V1. Together, the results from project 1 and project 2 suggest that DO cells are similar to simple cells in many ways, and these classes of neurons have a similar mechanism of processing edges than previously thought. This property has major implications in understanding the neural circuitry of these cell classes and their contributions to image processing, which I discuss in Chapters 2 & 3. In project 3, I investigated the impact of silencing neural activity on behavior by pioneering a fast and powerful neural inactivation technique in monkey cortex. The advantage of this technique is that the neural inactivation can be reversed on a trial-by-trial basis, which was difficult to achieve previously. Inactivation of V1 led to reduced sensitivity for visual detection by monkeys suggesting that V1 neural activity impacts visual perception. This result opens doors for possible therapeutic treatments of visual impairments and investigations of many outstanding questions in the domain of perception, action and cognition, which I discuss in Chapter 4. Collectively, my research has made important strides in the field of visual neuroscience by advancing our understanding of spatiochromatic processing by DO cells, and the impact of V1 neural activity on visual perception.
Download or read book Contrast Sensitivity written by Robert Shapley and published by MIT Press. This book was released on 1993 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The seventeen contributions present current research in visual signal processing, in the retina and central pathways, and in the study of contrast sensitivity in humans. The seventeen contributions present current research in visual signal processing, in the retina and central pathways, and in the study of contrast sensitivity in humans.
Download or read book Vision written by Jeanny Hrault and published by World Scientific. This book was released on 2010 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the fascinating frontiers of neurobiology, mathematics and psychophysics, this book addresses the problem of human and computer vision on the basis of cognitive modeling. After recalling the physics of light and its transformation through media and optics, Hrault presents the principles of the primate's visual system in terms of anatomy and functionality. Then, the neuronal circuitry of the retina is analyzed in terms of spatio?temporal filtering. This basic model is extended to the concept of neuromorphic circuits for motion processing and to the processing of color in the retina. For more in-depth studies, the adaptive non-linear properties of the photoreceptors and of ganglion cells are addressed, exhibiting all the power of the retinal pre-processing of images as a system of information cleaning suitable for further cortical processing. As a target of retinal information, the primary visual area is presented as a bank of filters able to extract valuable descriptors of images, suitable for categorization and recognition and also for local information extraction such as saliency and perspective. All along the book, many comparisons between the models and human perception are discussed as well as detailed applications to computer vision.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Science of Color written by Optical Society of America. Committee on Colorimetry and published by . This book was released on 1963 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elements of Neurogeometry written by Jean Petitot and published by Springer. This book was released on 2017-11-08 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes several mathematical models of the primary visual cortex, referring them to a vast ensemble of experimental data and putting forward an original geometrical model for its functional architecture, that is, the highly specific organization of its neural connections. The book spells out the geometrical algorithms implemented by this functional architecture, or put another way, the “neurogeometry” immanent in visual perception. Focusing on the neural origins of our spatial representations, it demonstrates three things: firstly, the way the visual neurons filter the optical signal is closely related to a wavelet analysis; secondly, the contact structure of the 1-jets of the curves in the plane (the retinal plane here) is implemented by the cortical functional architecture; and lastly, the visual algorithms for integrating contours from what may be rather incomplete sensory data can be modelled by the sub-Riemannian geometry associated with this contact structure. As such, it provides readers with the first systematic interpretation of a number of important neurophysiological observations in a well-defined mathematical framework. The book’s neuromathematical exploration appeals to graduate students and researchers in integrative-functional-cognitive neuroscience with a good mathematical background, as well as those in applied mathematics with an interest in neurophysiology.
Download or read book The Dynamic Receptive Field Structure of Cone Inputs to Macaque LGN and V1 Neurons written by Nicolas P. Cottaris and published by . This book was released on 2001 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Visual Psychophysics written by Zhong-Lin Lu and published by MIT Press. This book was released on 2013-10-11 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive treatment of the skills and techniques needed for visual psychophysics, from basic tools to sophisticated data analysis. Vision is one of the most active areas in biomedical research, and visual psychophysical techniques are a foundational methodology for this research enterprise. Visual psychophysics, which studies the relationship between the physical world and human behavior, is a classical field of study that has widespread applications in modern vision science. Bridging the gap between theory and practice, this textbook provides a comprehensive treatment of visual psychophysics, teaching not only basic techniques but also sophisticated data analysis methodologies and theoretical approaches. It begins with practical information about setting up a vision lab and goes on to discuss the creation, manipulation, and display of visual images; timing and integration of displays with measurements of brain activities and other relevant techniques; experimental designs; estimation of behavioral functions; and examples of psychophysics in applied and clinical settings. The book's treatment of experimental designs presents the most commonly used psychophysical paradigms, theory-driven psychophysical experiments, and the analysis of these procedures in a signal-detection theory framework. The book discusses the theoretical underpinnings of data analysis and scientific interpretation, presenting data analysis techniques that include model fitting, model comparison, and a general framework for optimized adaptive testing methods. It includes many sample programs in Matlab with functions from Psychtoolbox, a free toolbox for real-time experimental control. Once students and researchers have mastered the material in this book, they will have the skills to apply visual psychophysics to cutting-edge vision science.
Download or read book Human Color Vision written by Jan Kremers and published by Springer. This book was released on 2016-12-06 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our understanding of human color vision has advanced tremendously in recent years, helped along by many new discoveries, ideas, and achievements. It is therefore timely that these new developments are brought together in a book, assembled specifically to include new research and insight from the leaders in the field. Although intentionally not exhaustive, many aspects of color vision are discussed in this Springer Series in Vision Research book including: the genetics of the photopigments; the anatomy and physiology of photoreceptors, retinal and cortical pathways; color perception; the effects of disorders; theories on neuronal processes and the evolution of human color vision. Several of the chapters describe new, state-of-the-art methods within genetics, morphology, imaging techniques, electrophysiology, psychophysics, and computational neuroscience. The book gives a comprehensive overview of the different disciplines in human color vision in a way that makes it accessible to specialists and non-specialist scientists alike. About the Series: The Springer Series in Vision Research is a comprehensive update and overview of cutting edge vision research, exploring, in depth, current breakthroughs at a conceptual level. It details the whole visual system, from molecular processes to anatomy, physiology and behavior and covers both invertebrate and vertebrate organisms from terrestrial and aquatic habitats. Each book in the Series is aimed at all individuals with interests in vision including advanced graduate students, post-doctoral researchers, established vision scientists and clinical investigators. The series editors are N. Justin Marshall, Queensland Brain Institute, The University of Queensland, Australia and Shaun P. Collin, Neuroecology Group within the School of Animal Biology and the Oceans Institute at the University of Western Australia.
Download or read book Visual Mechanisms written by Heinrich Kluver and published by Literary Licensing, LLC. This book was released on 2012-04-01 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributing Authors Include A. C. Krause, George Wald, E. Gellhorn, And Many Others.
Download or read book Information Visualization written by Colin Ware and published by Elsevier. This book was released on 2013 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This is a book about what the science of perception can tell us about visualization. There is a gold mine of information about how we see to be found in more than a century of work by vision researchers. The purpose of this book is to extract from that large body of research literature those design principles that apply to displaying information effectively"--
Download or read book Handbook of Color Psychology written by Andrew J. Elliot and published by Cambridge University Press. This book was released on 2015-12-17 with total page 1737 pages. Available in PDF, EPUB and Kindle. Book excerpt: We perceive color everywhere and on everything that we encounter in daily life. Color science has progressed to the point where a great deal is known about the mechanics, evolution, and development of color vision, but less is known about the relation between color vision and psychology. However, color psychology is now a burgeoning, exciting area and this Handbook provides comprehensive coverage of emerging theory and research. Top scholars in the field provide rigorous overviews of work on color categorization, color symbolism and association, color preference, reciprocal relations between color perception and psychological functioning, and variations and deficiencies in color perception. The Handbook of Color Psychology seeks to facilitate cross-fertilization among researchers, both within and across disciplines and areas of research, and is an essential resource for anyone interested in color psychology in both theoretical and applied areas of study.
Download or read book Classic Cases in Neuropsychology written by Chris Code and published by Psychology Press. This book was released on 2004-08-02 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of detailed examination and theoretical interpretation of the single case has been increasingly recognized in neuropsychology. This book brings together in one volume discussion of the classic cases which have shaped the way we think about the relationships between brain, behaviour and cognition. The single cases covered may be ancient or modern, famous or less well-known. But the book is comprehensive in its coverage of contemporary neuropsychological issues. Represented are classic cases in language, memory, perception, attention and praxis. Some of the cases included are rare, or have acted as catalysts to the development of theory. Some have remained the definitive case; many were the first of their type to be described and gave rise to the development of new syndrome entities. Some are still controversial. In some instances, the cases resulted in major paradigm shifts. Some, while still highly influential, were misinterpreted. But most of them were read only by a few in their original form. Each chapter highlights the relevance of the case for the development of neuropsychology, describes the particular features of the case that are interesting and discusses the theoretical implications.
Download or read book Stevens Handbook of Experimental Psychology and Cognitive Neuroscience Set written by John T. Wixted and published by Wiley. This book was released on 2018-04-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first edition was published in 1951, The Stevens' Handbook of Experimental Psychology has been recognized as the standard reference in the field. The most recent (3rd) edition of the handbook was published in 2004, and it was a success by any measure. But the field of experimental psychology has changed in dramatic ways since then. Throughout the first 3 editions of the handbook, the changes in the field were mainly quantitative in nature. That is, the size and scope of the field grew steadily from 1951 to 2004, a trend that was reflected in the growing size of the handbook itself: the 1-volume first edition (1951) was succeeded by a 2-volume second edition (1988) and then by a 4-volume third edition (2004). Since 2004, however, this still-growing field has also changed qualitatively in the sense that, in virtually every subdomain of experimental psychology, theories of the mind have evolved into theories of the brain. Research methods in experimental psychology have changed accordingly and now include not only venerable EEG recordings (long a staple of research in psycholinguistics) but also MEG, fMRI, TMS, and single-unit recording. The trend towards neuroscience is an absolutely dramatic, worldwide phenomenon that is unlikely to ever be reversed. Thus, the era of purely behavioral experimental psychology is already long gone, even though not everyone has noticed. Experimental psychology and "cognitive neuroscience" (an umbrella term that includes behavioral neuroscience, social neuroscience and developmental neuroscience) are now inextricably intertwined. Nearly every major psychology department in the country has added cognitive neuroscientists to its ranks in recent years, and that trend is still growing. A viable handbook of experimental psychology should reflect the new reality on the ground. There is no handbook in existence today that combines basic experimental psychology and cognitive neuroscience, this despite the fact that the two fields are interrelated – and even interdependent – because they are concerned with the same issues (e.g., memory, perception, language, development, etc.). Almost all neuroscience-oriented research takes as its starting point what has been learned using behavioral methods in experimental psychology. In addition, nowadays, psychological theories increasingly take into account what has been learned about the brain (e.g., psychological models increasingly need to be neurologically plausible). These considerations explain why this edition of: The Stevens' Handbook of Experimental Psychology is now called The Stevens' Handbook of Experimental Psychology and Cognitive Neuroscience. The title serves as a reminder that the two fields go together and as an announcement that the Stevens' Handbook covers it all. The 4th edition of the Stevens’ Handbook is a 5-volume set structured as follows: I. Learning & Memory: Elizabeth Phelps & Lila Davachi (Volume Editors) Topics include fear learning; time perception; working memory; visual object recognition; memory and future imagining; sleep and memory; emotion and memory; attention and memory; motivation and memory; inhibition in memory; education and memory; aging and memory; autobiographical memory; eyewitness memory; and category learning. II. Sensation, Perception & Attention: John Serences (Volume Editor) Topics include attention; vision; color vision; visual search; depth perception; taste; touch; olfaction; motor control; perceptual learning; audition; music perception; multisensory integration; vestibular, proprioceptive, and haptic contributions to spatial orientation; motion perception; perceptual rhythms; the interface theory of perception; perceptual organization; perception and interactive technology; perception for action. III. Language & Thought: Sharon Thompson-Schill (Volume Editor) Topics include reading; discourse and dialogue; speech production; sentence processing; bilingualism; concepts and categorization; culture and cognition; embodied cognition; creativity; reasoning; speech perception; spatial cognition; word processing; semantic memory; moral reasoning. IV. Developmental & Social Psychology: Simona Ghetti (Volume Editor) Topics include development of visual attention; self-evaluation; moral development; emotion-cognition interactions; person perception; memory; implicit social cognition; motivation group processes; development of scientific thinking; language acquisition; category and conceptual development; development of mathematical reasoning; emotion regulation; emotional development; development of theory of mind; attitudes; executive function. V. Methodology: E. J. Wagenmakers (Volume Editor) Topics include hypothesis testing and statistical inference; model comparison in psychology; mathematical modeling in cognition and cognitive neuroscience; methods and models in categorization; serial versus parallel processing; theories for discriminating signal from noise; Bayesian cognitive modeling; response time modeling; neural networks and neurocomputational modeling; methods in psychophysics analyzing neural time series data; convergent methods of memory research; models and methods for reinforcement learning; cultural consensus theory; network models for clinical psychology; the stop-signal paradigm; fmri; neural recordings; open science.
Download or read book Color Vision written by Karl R. Gegenfurtner and published by Cambridge University Press. This book was released on 2001-05-28 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Color Vision, first published in 2000, defines the state of knowledge about all aspects of human and primate color vision.
Download or read book Journal of the Optical Society of America written by and published by . This book was released on 2005 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Full Reference Image Quality Metrics written by Marius Pedersen and published by Foundations and Trends(r) in C. This book was released on 2012-02 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text surveys one full-reference image quality metrics. It starts by classifying these image quality metrics into four different groups and then selects further image quality metrics from each group and evaluates them against six state-of-the-art image quality databases.
