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The Functional Dissection Of Motion Processing Pathways In The Human Visual Cortex Using Fmri Guided Tms
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Book Synopsis The Functional Dissection of Motion Processing Pathways in the Human Visual Cortex Using FMRI-guided TMS. by : Samantha Louise Strong
Download or read book The Functional Dissection of Motion Processing Pathways in the Human Visual Cortex Using FMRI-guided TMS. written by Samantha Louise Strong and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visual Motion Processing in the Human Cortex by : Alexander Christopher Huk
Download or read book Visual Motion Processing in the Human Cortex written by Alexander Christopher Huk and published by . This book was released on 2001 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of Visual Motion Processing by : Guillaume S. Masson
Download or read book Dynamics of Visual Motion Processing written by Guillaume S. Masson and published by Springer Science & Business Media. This book was released on 2009-12-02 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis FMRI of Attention in the Human Visual Motion Processing System by : Michael S. Beauchamp
Download or read book FMRI of Attention in the Human Visual Motion Processing System written by Michael S. Beauchamp and published by . This book was released on 1997 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Color and Motion Processing in Human Cortical Areas MT+, V4, and Vo Investigated by Online Repetitive Transcranial Magnetic Stimulation (TMS) by : Irem Önay
Download or read book Color and Motion Processing in Human Cortical Areas MT+, V4, and Vo Investigated by Online Repetitive Transcranial Magnetic Stimulation (TMS) written by Irem Önay and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The visual environment contains a vast amount of information which is encoded efficiently by the visual system through the use of segregated dorsal and ventral streams. This study investigates the interaction between selected areas in the parallel dorsal and ventral pathways with the use of online repetitive TMS. The effects of TMS on two psychophysical tasks were investigated: a global motion task directed at the specialties of dorsal area hMT+ and a color contrast task directed at the specialties of ventral areas VO and V4. In each case, TMS was applied to the selected areas and a control area (vertex). Regions of interest were localized using fMRI. As our global motion task, we used a two-interval speed discrimination task with achromatic random dot kinematograms (RDKs) as stimuli, in which subjects were presented with a reference stimulus in the first interval and a test stimulus in the second interval. Regions of interest were dorsal area hMT+ and ventral area V4. The color contrast discrimination task consisted of isoluminant red stationary RDKs masked by achromatic noise and a similar two-interval design. Regions of interest were ventral area VO and dorsal area hMT+. Tasks were performed without and with TMS. We developed a task using two reference stimuli to avoid learning effects to replace the single fixed reference used in other studies. TMS was always applied during the second (test) interval. In the speed discrimination task, TMS was found to cause a perceived slowing of global motion stimuli, indicated by a significant increase in "test slower than reference" responses. This effect was not area-specific. Reaction times were longer with the TMS of hMT+ and shorter with the TMS of V4 compared to control, however, this difference did not reach significance. In the color contrast discrimination task, TMS did not have an effect on perceived contrast. Reaction times were longer with the TMS of VO and shorter with the TMS of hMT+ compared to control; again, this difference was non-significant. In conclusion, online rTMS was found to slow down motion perception. The trends seen in reaction times indicate a dissociation between dorsal and ventral areas and suggest that these areas exert a level of inhibition on each other. These findings provide insights into the working of dorsal and ventral streams in the visual system and pave the way for future studies." --
Book Synopsis The Analysis of FMRI Data with Applications in Human Visual Cortex by : Rehan M. Khan
Download or read book The Analysis of FMRI Data with Applications in Human Visual Cortex written by Rehan M. Khan and published by . This book was released on 1999 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Role of Early Visual Cortex in Global Motion Processing by : Marshall L. Green
Download or read book The Role of Early Visual Cortex in Global Motion Processing written by Marshall L. Green and published by . This book was released on 2018 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both visual area V1 and the medial temporal (MT) region of the human brain are involved in motion perception. V1 is thought to process “local motion,” such as the movement of a bird flying across a relatively small part of space, while MT is thought to process “global motion,” such as the movement of a flock of birds flying across the sky. However, recent studies using fMRI to measure human brain activity have identified signals in V1 that appear to be global motion signals, although it is unclear whether these are related to global motion processing or some other process. In two experiments, a series of stimulus manipulations were conducted to determine the extent to which these signals in V1 reflect global motion. Although initial results have so far proven inconclusive, they highlight discrepancies between previous results, suggesting that V1 motion signals may be more interesting than researchers have assumed.
Book Synopsis Low-level Visual Cortex and Motion Perception by : Nicolas Wotawa
Download or read book Low-level Visual Cortex and Motion Perception written by Nicolas Wotawa and published by . This book was released on 2006 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of cerebral imaging technologies combined with specific image processing algorithms contribute to improving our knowledge of the brain functioning, in particular regarding visual perception. This thesis contributes to current understanding implied in visual motion perception in humans, based on complementary information brought by different Magnetic Resonance Imaging (MRI) modalities. The first part of this work focuses on functional MRI (fMRI) identification of low-level visual areas. We detail the fMRI retinotopic mapping procedure we developed, from the stimulus design to the final anatomo-functional analysis. A specific functional localization of the hMT/V5+ complex is also obtained with a block design. These methods, optimized according to some stimulation parameters, allow the extraction of individually defined and homogeneous Regions Of Interest (ROI). In the second part, we characterize functionally these previously identified low-level visual areas. Based on the recent fMR-Adaptation paradigm, which allows to investigate the sensitivity of a cortical region to quantitative variations of a given feature, we demonstrate a functional differentiation across areas regarding their relative sensitivity to visual direction of motion. Lastly, we combine fMRI and Diffusion Tensor MRI (DTI) to study the anatomical connectivity within the low-level visual cortex. Based on state of the art white matter fibers mapping algorithms, this characterization gives insights on the network of areas implied, among others, in visual motion processing.
Book Synopsis Updates on multisensory perception: from neurons to cognition by : Angelo Maravita
Download or read book Updates on multisensory perception: from neurons to cognition written by Angelo Maravita and published by Frontiers E-books. This book was released on with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years there has been a dramatic progress in understanding how stimuli from different sensory modalities are integrated among each other. Multisensory integration results in a unitary representation of the world that strongly characterizes perception and cognition in humans. Knowledge about multi sensory integration has research techniques and approaches, including neurophysiology, experimental psychology, neuropsychology, neuroimaging, and computational modelling. This special issue aims at presenting an up-to-date integrative overview of the physiological, psychological, developmental, and functional processes associated with multisensory integration. The proposed collection of papers is organized thematically into sections, each featuring a state-of-the-art review of key themes in multisensory research, from more approaches in the animal, to the study of multisensory perception and cognition in humans. Specifically, this special issue will consider: The physiological mechanisms of multisensory processing in cortical and subcortical brain structures of model animal species, (rat, cat, and monkey); current biologically inspired computational modelling of multisensory integration; evidence about the multisensory contributions to perception in humans, as highlighted by psychophysical and neuropsychological evidence; the neural basis of multisensory processing in the human brain uncovered by recent neuroimaging techniques, including EEG, PET, fMRI; the consequences of the breakdown of normal sensory integration as shown by studies with techniques of brain stimulation in humans; developmental processes of multisensory perception in humans and the constrains for the emergence of multisensory processes in relation to sensory experience; the issue of crossmodal neuroplasticity concerning behavioral and neural changes following sensory deprivation. The challenge of this Research Topic is to provide an interdisciplinary context allowing to understand the basic principles of multisensory integration in humans and the key issues that this fascinating field of study rises for future research.
Book Synopsis The Auditory Cortex by : Jeffery A. Winer
Download or read book The Auditory Cortex written by Jeffery A. Winer and published by Springer Science & Business Media. This book was released on 2010-12-02 with total page 711 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been substantial progress in understanding the contributions of the auditory forebrain to hearing, sound localization, communication, emotive behavior, and cognition. The Auditory Cortex covers the latest knowledge about the auditory forebrain, including the auditory cortex as well as the medial geniculate body in the thalamus. This book will cover all important aspects of the auditory forebrain organization and function, integrating the auditory thalamus and cortex into a smooth, coherent whole. Volume One covers basic auditory neuroscience. It complements The Auditory Cortex, Volume 2: Integrative Neuroscience, which takes a more applied/clinical perspective.
Book Synopsis Dynamic Coordination in the Brain by : Christoph von der Malsburg
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 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nervous systems do not live by the rate code alone. The ceaseless activities of groups of neurons are choregraphed into waves, oscillations, synchronized rhythms, and transient coalitions; it is these that underlie behavior, memory, and conscious perception. This exuberant manifesto masterfully summarizes and reflects upon the relevant evidence of these patterns from all manner of brains, small and large." --
Book Synopsis Atlas of Human Brain Connections by : Marco Catani
Download or read book Atlas of Human Brain Connections written by Marco Catani and published by Oxford University Press, USA. This book was released on 2012-06-14 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the major challenges of modern neuroscience is to define the complex pattern of neural connections that underlie cognition and behaviour. This atlas capitalises on novel diffusion MRI tractography methods to provide a comprehensive overview of connections derived from virtual in vivo tractography dissections of the human brain.
Book Synopsis A Combined MRI and Histology Atlas of the Rhesus Monkey Brain in Stereotaxic Coordinates by : Kadharbatcha S. Saleem
Download or read book A Combined MRI and Histology Atlas of the Rhesus Monkey Brain in Stereotaxic Coordinates written by Kadharbatcha S. Saleem and published by Academic Press. This book was released on 2012-04-23 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Combined MRI and Histology Atlas of the Rhesus Monkey Brain in Stereotaxic Coordinates, Second Edition maps the detailed architectonic subdivisions of the cortical and subcortical areas in the macaque monkey brain using high-resolution magnetic resonance (MR) images and the corresponding histology sections in the same animal. This edition of the atlas is unlike anything else available as it includes the detailed cyto- and chemoarchitectonic delineations of the brain areas in all three planes of sections (horizontal, coronal, and sagittal) that are derived from the same animal. This is a significant progress because in functional imaging studies, such as fMRI, both the horizontal and sagittal planes of sections are often the preferred planes given that multiple functionally active regions can be visualized simultaneously in a single horizontal or sagittal section. This combined MRI and histology atlas is designed to provide an easy-to-use reference for anatomical and physiological studies in macaque monkeys, and in functional-imaging studies in human and non-human primates using fMRI and PET. The first rhesus monkey brain atlas with horizontal, coronal, and sagittal planes of sections, derived from the same animal Shows the first detailed delineations of the cortical and subcortical areas in horizontal, coronal, and sagittal plane of sections in the same animal using different staining methods Horizonal series illustrates the dorsoventral extent of the left hemisphere in 47 horizontal MRI and photomicrographic sections matched with 47 detailed diagrams (Chapter 3) Coronal series presents the full rostrocaudal extent of the right hemisphere in 76 coronal MRI and photomicrographic sections, with 76 corresponding drawings (Chapter 4) Sagittal series shows the complete mediolateral extent of the left hemisphere in 30 sagittal MRI sections, with 30 corresponding drawings (Chapter 5). The sagittal series also illustrates the location of different fiber tracts in the white matter Individual variability - provides selected cortical and subcortical areas in three-dimensional MRI (horizontal, coronal, and sagittal MRI planes). For comparison, it also provides similar areas in coronal MRI section in six other monkeys. (Chapter 6) Vasculature - indicates the corresponding location of all major blood vessels in horizontal, coronal, and sagittal series of sections Provides updated information on the cortical and subcortical areas, such as architectonic areas and nomenclature, with references, in chapter 2 Provides the sterotaxic grid derived from the in-vivo MR image
Book Synopsis Stroke Syndromes, 3ed by : Louis R. Caplan
Download or read book Stroke Syndromes, 3ed written by Louis R. Caplan and published by Cambridge University Press. This book was released on 2012-07-12 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive survey of dysfunction due to stroke, this revised edition remains the definitive guide to stroke patterns and syndromes.
Book Synopsis Fiber Pathways of the Brain by : Jeremy D. Schmahmann
Download or read book Fiber Pathways of the Brain written by Jeremy D. Schmahmann and published by OUP USA. This book was released on 2009-02-11 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: The text is enriched throughout by close attention to functional aspects of the anatomical observations."--Jacket.
Author :Wibke S. Müller-Forell Publisher :Springer Science & Business Media ISBN 13 :354027989X Total Pages :454 pages Book Rating :4.5/5 (42 download)
Book Synopsis Imaging of Orbital and Visual Pathway Pathology by : Wibke S. Müller-Forell
Download or read book Imaging of Orbital and Visual Pathway Pathology written by Wibke S. Müller-Forell and published by Springer Science & Business Media. This book was released on 2005-12-29 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deals with imaging of pathology of the visual system. This book is divided into two parts, general and special. In the general part, important basics of modern imaging methods are discussed. The knowledge on the indication, technique, and results of functional MR imaging is also presented.
Book Synopsis Brain and Visual Perception by : David H. Hubel M.D.
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.
