Download or read book Latencies of the Spatial Components of the Retinal Ganglion Cell Receptive Field written by Mary Lou Mallon and published by . This book was released on 1986 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Webvision written by Helga Kolb and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Spatial Organisation of Receptive Fields in Mammalian Retinal Ganglion Cells written by Craig R. Vonhoff and published by . This book was released on 2012 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interference Fringes Used to Determine Retinal Ganglion Cell Receptive Field Sizes written by Charles M. Wormington and published by . This book was released on 1982 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is presented for determining the effective diameter of retinal ganglion cell receptive field centers. Unaffected by the optics of the eye, the method involves single-unit recording of ganglion cell activity in response to drifting interference fringe patterns of various spatial frequencies. The ganglion cell response magnitude (contrast) falls off as the spatial frequency of the fringes is increased. From the spatial frequency dependence of the observed responses, the receptive field centers of the sampled X-cells were estimated to range from 6.8 to 10 micron in diameter. Suggested improvements to the technique are discussed.
Download or read book An Analysis of Spatial Summation in the Receptive Fields of Goldfish Retinal Ganglion Cells written by Michael W. Levine and published by . This book was released on 1972 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applications of Parallel Processing in Vision written by J.R. Brannan and published by Elsevier. This book was released on 1992-01-23 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerable evidence exists that visual sensory information is analyzed simultaneously along two or more independent pathways. In the past two decades, researchers have extensively used the concept of parallel visual channels as a framework to direct their explorations of human vision. More recently, basic and clinical scientists have found such a dichotomy applicable to the way we organize our knowledge of visual development, higher order perception, and visual disorders, to name just a few. This volume attempts to provide a forum for gathering these different perspectives.
Download or read book Spatial Interaction in Peripheral Vision written by Arthur Jean Riopelle and published by . This book was released on 1950 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Retinal Ganglion Cell Survival and Plasticity of Extrastriate Visual Cortex Following Neonatal Damage to Primary Visual Cortex written by Kurt R. Illig and published by . This book was released on 1997 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Spatiotemporal Receptive Field Properties of Rat Retinal Ganglion Cells written by Walter Ferdinand Heine and published by . This book was released on 2011 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The function of the retina is to encode relevant features of the visual world in the form of neural spike trains. These are transmitted to higher visual centers in the brain by retinal ganglion cells (RGCs), which form the neural output of the retina. Little is known about the receptive field properties of these cells in the rat. In vivo recording techniques were used to record from RGC axons while visual stimuli were displayed on a cathode ray tube. Rats have a wide visual field and large receptive fields. In order to capture the majority of the visual field, the monitor was placed in close proximity to the eye of the animal. Visual stimulus patterns such as luminance gratings appear distorted at a close viewing distance. We therefore simulated a spherical screen with the eye at its center. Cells shared many properties with those of other species but also exhibited some notable differences. Some cells exhibited the characteristic linear and nonlinear spatial summation of cat X and Y cells and were therefore labeled as X and Y-like. More rarely encountered cell types included the suppressed by contrast and ON-OFF surround cells. In contrast to their counterparts in the cat, X and Y-like cells in the rat had similar receptive field sizes. In the temporal domain, X-like cells exhibited sustained response dynamics to square wave modulated spots. Y-like cells, on the other hand, displayed both sustained and transient response dynamics. Both cell types responded to full field stimuli by reducing their gain at low temporal frequencies and exhibiting a resonance at higher frequencies. These results question the commonly assigned roles of X-like cells in high acuity vision and Y-like cells in motion detection. Anatomical data on their morphological properties and projection pattern will provide additional insight into their possible functional roles. Photodynamic staining provides a means of targeting cells for electrophysiological recordings that display specific morphological and projection patterns. We found enhanced photodynamic staining in media supplemented with oxygen or hydrogen peroxide. This information will aid future experiments correlating the anatomical and electrophysiological properties of RGC types.
Download or read book Anatomy Ocular physiology Biochemistry and genetics Pathology Microbiology Immunology Growth and senescence Optics Therapeutics Lasers and instrument technology Basic biostatistical and epidemiological terms written by Louise Bye and published by OUP Oxford. This book was released on 2013-05-23 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indispensable and fully comprehensive textbook, this covers the basic sciences in ophthalmology and is the only book you need to pass the FRCOphth Part 1 exam.
Download or read book Neural Engineering written by Chris Eliasmith and published by MIT Press. This book was released on 2003 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: A synthesis of current approaches to adapting engineering tools to the study of neurobiological systems.
Download or read book Response of Cat Retinal Ganglion Cells to Brief Light Flashes written by James Lee Zacks and published by . This book was released on 1967 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Organization of the Retina written by Leo M. Chalupa and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development and Organization of the Retina offers an invaluable survey of contemporary research issues and methods dealing with the retina and retinal projections. The book's 19 chapters report on investigations into two areas: research into the organization of the mature retina and work on developmental issues. A sampling of chapter topics includes -- embryonic patterning of cone subtypes in the mammalian retina -- synaptic transmission between retinal neurons -- scaling the retina, macro and micro -- retinal ganglion cell axonal transport, and more.
Download or read book Society for Neuroscience Abstracts written by Society for Neuroscience. Annual Meeting and published by . This book was released on 1987 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Artificial Vision written by Veit Peter Gabel and published by Springer. This book was released on 2016-11-24 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents and analyses the most recent research dedicated to restoring vision in individuals who are severely impaired or blind from retinal disease or injury. It is written by the leading groups worldwide who are at the forefront of developing artificial vision. The book begins by discussing the difficulties in comparing and interpreting functional results in the area of very low vision and the principal prospects and limitations of spatial resolution with artificial tools. Further on, chapters are included by researchers who stimulate the surface or the pigment epithelial side of the retina and by experts who work on stimulating the optic nerve, the lateral geniculate body and the superficial layers of the visual cortex. Artificial Vision: A Clinical Guide collates the most recent work of key artificial vision research groups to explain in a comparable and stringent order their varying approaches, the clinical or preclinical outcomes and their achievements during the last years. Senior ophthalmic fellows and academic practitioners will find this guide to be an indispensable resource for understanding the current status of artificial vision.
Download or read book Temporal Contrast Adaptation in Identified Types of Retinal Ganglion Cells written by Divya Chander and published by . This book was released on 2002 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
