Neural Basis Of Visual Motion Perception
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Neural Basis Of Visual Motion Perception
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Author : Yunmin Wu
language : en
Publisher:
Release Date : 2019
Neural Basis Of Visual Motion Perception written by Yunmin Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Dynamics Of Visual Motion Processing
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Author : Guillaume S. Masson
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-12-02
Dynamics Of Visual Motion Processing written by Guillaume S. Masson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-12-02 with Medical categories.
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.
Neural Basis Of Motion Perception For Visual Navigation
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Author :
language : en
Publisher:
Release Date : 2010
Neural Basis Of Motion Perception For Visual Navigation written by 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.
Neural Basis Of Motion Perception For Visual Navigation
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Author : Saqib Ishaq Khan
language : en
Publisher:
Release Date : 2010
Neural Basis Of Motion Perception For Visual Navigation written by Saqib Ishaq Khan 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.
Investigation In Neural Computation And Circuitry Of Human Visual Motion Perception
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Author : Javier Omar Garcia
language : en
Publisher:
Release Date : 2009
Investigation In Neural Computation And Circuitry Of Human Visual Motion Perception written by Javier Omar Garcia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Motion is an important cue in the everyday lives of visual creatures. Motion information facilitates the separation of figure from background, aides in seeing objects that would otherwise be effectively camouflaged and surfaces that would be otherwise imperceptible. The research presented is an investigation of the neural correlates of complex motion stimuli. Experiment 1 is a psychophysical investigation of a complex motion phenomenon, called biological motion. Previous research has shown the resilience of this stimulus under highly degraded conditions, but by creating stimuli that favor the "form system", we measured the reliance of biological motion perception on the "motion system". We challenge form-based biological motion research, and we conclude that motion perception is necessary (but not sufficient) for perceiving biological motion. We conjecture that this insufficiency is due to another mechanism, in addition to those involved in simple motion discriminations. Experiment series 2 is a neuroimaging investigation of biological motion as a function of contrast modulations, which seeks to find the neural correlate of the effect found in Experiment 1. We specifically targeted the human middle temporal complex (hMT+, the motion-sensitive human homologue to monkey MT), a region implicated in motion perception and historically important in neuroscience research. We find the responses in hMT+ to be stimulus-dependent and to be a part of network of brain regions supporting complex motion perception. Experiment series 3 is a neuroimaging investigation of another form of complex motion perception, a phenomenon called motion transparency. When the visual system encounters two overlapping motion vectors, it resolves them by segmenting them into different surfaces (or objects). We attempt to uncover the neural basis of object segmentation defined by motion vectors. We find the hMT to house competing motion vectors with mutual inhibition, including a local competition between motion vectors as well as a global competition between motion-defined surfaces. These results add to the expansive literature on motion processing and depart from a more traditional depiction of the neural underpinnings of motion perception.
Perceptual Consequences Of Surround Suppression And Plasticity In Visual Motion Processing
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Author : Liu Liu
language : en
Publisher:
Release Date : 2017
Perceptual Consequences Of Surround Suppression And Plasticity In Visual Motion Processing written by Liu Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
"The visual nervous system transforms the input from the visual scene into electrical signals. The electrical signals are in turn read out by other areas of the brain to form perceptual decisions. The relationship between neuronal responses evoked by sensory stimuli and their perceptual correlates is an important research question in modern computational and systems neuroscience. Previous studies of this relationship focused on correlating the response of single neurons to stimuli in their receptive field (RF), defined as a region of the visual space where selective stimuli can evoke a response. However, single neurons are part of a local circuitry that controls their selectivity and modulates their response. The local circuitry is composed of many neurons that encode surrounding regions of the visual space. The neurons in the circuit can interact via excitatory or inhibitory connections. The interactions are crucial for contextual modulation of single neuron response, since any stimulus on the RF of a neuron is part of a larger visual context. Aside from the contextual modulation of neuronal responses, another part of the sensory-to-decision transformation is how the responses of neurons are read out from a population. Correlations in the responses of neurons can have a large impact in the amount of information in a population, and this correlation should be quantified when considering a population readout.Another level of complexity is that downstream areas must use this sensory code flexibly in perceptual decision making. Many neurons and areas can contain the information about the sensory stimulus, and the readout should correspond to the experience of the animal. This thesis investigates these issues in order. In chapter 2, I determine the neural basis for a type of contextual modulation in our motion perception, the worsening of motion perception at large stimulus size. Large stimuli suppress the firing rate of neurons in a form of contextual modulation known as surround suppression. I simultaneously record from multiple neurons in the middle temporal visual area (MT), and I perform a simulation of the recorded responses and the correlation structure. I find surround suppression improves the population sensitivity for small stimuli at the expense of weaker sensitivity for large stimuli. In chapter 3, I examine the underlying circuitry mechanisms for surround suppression. Recent work suggests that the cortex operates in a theoretical network where excitation alone is strong enough to induce instability but inhibition maintains the stability. I pharmacologically manipulate the efficacy of inhibitory processes and find that the neuronal dynamics are consistent with the predictions. I then perform additional experiments to confirm that this network mechanism can be generalized to different stimulus dimensions in MT. In chapter 4, I examine the flexibility of the readout of sensory information. The readout of sensory evidence for visual perception is plastic and depends on recent training experience. I use reversible inactivation and microstimulation to probe the causal relationship between MT neuronal response and perception. I find the causal contribution of MT to visual motion perception depends on training the animals on a specific task of motion integration. This thesis has implications in the broader context of neural coding in health and diseases. Previous work shows that natural aging or disease processes can lead to deficits in our sensory perception, and the reduction of inhibition efficacy has been implicated. Therefore, an understanding of the inhibitory interactions in local cortical circuitry may lead to future treatments and interventions." --
Neural Basis Of Motion Perception
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Author : V. S. Ramachandran
language : en
Publisher:
Release Date : 1993
Neural Basis Of Motion Perception written by V. S. Ramachandran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Binocular vision categories.
This research is concerned with visual surface representation and the manner in which visual image segmentation influences certain early visual processes such as stereopsis, motion correspondence, structure from motion, shape from shading, and the "aperture problem." A number of new visual effects in the laboratory (e.g. "motion capture", stereoscopic capture, etc.) have given novel insights in to the mechanisms underlying human motion perception and stereopsis.
Neural Basis Of Motion Perception
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Author : V. S. Ramachandran
language : en
Publisher:
Release Date : 1993
Neural Basis Of Motion Perception written by V. S. Ramachandran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Binocular vision categories.
This research is concerned with visual surface representation and the manner in which visual image segmentation influences certain early visual processes such as stereopsis, motion correspondence, structure from motion, shape from shading, and the "aperture problem." A number of new visual effects in the laboratory (e.g. "motion capture", stereoscopic capture, etc.) have given novel insights in to the mechanisms underlying human motion perception and stereopsis.
Visual Perception Part 1
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Author : Susana Martinez-Conde
language : en
Publisher: Elsevier
Release Date : 2006-10-05
Visual Perception Part 1 written by Susana Martinez-Conde and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-10-05 with Psychology categories.
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
Visual Perception
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Author : Lothar Spillmann
language : en
Publisher: Elsevier
Release Date : 2012-12-02
Visual Perception written by Lothar Spillmann and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Psychology categories.
This book presents an interdisciplinary overview of the main facts and theories that guide contemporary research on visual perception. While the chapters cover virtually all areas of visual science, from philosophical foundations to computational algorithms, and from photoreceptor processes to neuronal networks, no attempt has been made to provide an exhaustive treatment of these topics. Rather, researchers from such diverse disciplines as psychology, neurophysiology, anatomy, and clinical vision sciences have worked together to review some of the most important correlations between perceptual phenomena and the underlying neurophysiological processes and mechanisms. The book is thus intended to serve as an advanced text for graduate students and as a guide for all vision researchers to understanding current progress outside their specialized fields of interest. ï Examines parallel processing of visual informationï Discusses links between physiologically-measured receptive fields and psychophysically-measured perceptive fieldsï Presents a spatial sampling by the retina and cortical modulesï Covers signal transduction and the sites of adaptationï Describes a single-cell analysis of attentionï Discusses computational models of vision