Mechanisms Of Spatial Localization In The Human Visual System
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Mechanisms Of Spatial Localization In The Human Visual System
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Author : Özgür Yilmaz
language : en
Publisher:
Release Date : 2007
Mechanisms Of Spatial Localization In The Human Visual System written by Özgür Yilmaz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Space perception categories.
Neural Mechanisms Of Position Perception
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Author : Jessica Wright
language : en
Publisher:
Release Date : 2014
Neural Mechanisms Of Position Perception written by Jessica Wright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Visual perception categories.
Visual perception is a reconstruction of the physical visual aspects of the world and subject to various biases, assumptions and noise. One aspect of visual perception is visuospatial localization. Although visual localization is typically accurate, there are various situations where healthy human subjects mislocalize objects, as well as, neurological disorders that alter visual localization behavior. These situations result in differences between the perceived and actual position of an object. These perceptual errors are useful to explore the limitations of visuospatial object localization and provide information on the underlying neural mechanisms of position perception. In particular, the following studies investigated how the brain integrates visual information across a spatially extended stimulus and ultimately results in a final percept of position. This project utilized behavioral and fMRI studies combined with transcranial direct current stimulation (tDCS) in healthy human subjects. These methods allowed us to quantify behavioral errors in localization and examine changes in the BOLD signal (as an indirect measure of changes in neural activity) in potential neural correlates of position perception. In Aim 1 we show that factors such as retinal eccentricity and attentional cues bias localization behavior via alterations of the contribution of specific object components in the integration process. Aim 2 shows that tDCS over posterior parietal cortex (PPC) yields mislocalizations that are consistent with predictions from the interhemispheric competition theory (ICT) of attention. This supports the causal role of PPC in visual spatial localization. Aim 3 extends the results from Aim 2 to show that the BOLD signal changes in PPC predict localization behavior. In addition to novel insights related to position perception, these experiments provide insight into the effects of tDCS on behavior and the interaction of tDCS with the BOLD signal. This work begins to answer how different factors influence position perception and the role of different cortical regions in position perception. This research also has implications for rehabilitation programs for patients with various visual neurological disorders that alter spatial perception.
Some Properties Of Spatial Frequency Mechanisms In The Human Visual System
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Author : M. N. Williams
language : en
Publisher:
Release Date : 1984
Some Properties Of Spatial Frequency Mechanisms In The Human Visual System written by M. N. Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
Multiple Mechanisms Of Visual Localization Evidence From Movement And Memory Phenomena Spatial Vision Position
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Author : JOHN CLINTON PALMER
language : en
Publisher:
Release Date : 1984
Multiple Mechanisms Of Visual Localization Evidence From Movement And Memory Phenomena Spatial Vision Position written by JOHN CLINTON PALMER and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
equivalent tradeoff of the position variables should be undisturbed by substituting a different delay.
Localization Capabilities Of Vep Source Localization And Functional Magnetic Resonance Imaging In Human Visual Cortex
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Author : Suzanne Lyn Baker
language : en
Publisher:
Release Date : 2003
Localization Capabilities Of Vep Source Localization And Functional Magnetic Resonance Imaging In Human Visual Cortex written by Suzanne Lyn Baker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Brain Mechanisms And Spatial Vision
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Author : David J. Ingle
language : en
Publisher:
Release Date : 1985
Brain Mechanisms And Spatial Vision written by David J. Ingle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Research Awards Index
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Author :
language : en
Publisher:
Release Date : 1989
Research Awards Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Medicine categories.
Spatiotemporal Characteristics Of Human Visual Localization
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Author :
language : en
Publisher:
Release Date : 1992
Spatiotemporal Characteristics Of Human Visual Localization written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Psychophysical studies of the processes underlying relative localization in human vision were conducted. Specifically, the focus of this granting period was characterizing the spatial characteristics of the units that encode spatial location. Evidence was found for a higher-order scaled representation of position in which the size of position integration areas scales with the distance being encoded. This scaling of the position integration areas was found to account well for the increase in separation discrimination thresholds with increasing separation. The position integration areas were shown not to integrate luminance, but were shown to depend on an initial spatial organization of the scene. The time course of the position integration was also investigated. Additional studies investigated the relationship between position integration and the Muller-Lyer illusion, and the effect of the spatial frequency of a masking stimulus (presented at termination of the separation discrimination stimulus) on separation discrimination thresholds.
French Exhibition Sydney
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Author :
language : en
Publisher:
Release Date : 1956*
French Exhibition Sydney written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956* with Art categories.
Spatiotemporal Characteristics Of Visual Localization
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Author : Christina A. Burbeck
language : en
Publisher:
Release Date : 1985
Spatiotemporal Characteristics Of Visual Localization written by Christina A. Burbeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
The main thrust of this research effort has been investigation of the spatial and temporal properties of the visual processes underlying relative spatial localization by human observers. The initial tasks were development of a suitable laboratory display system for generating the required stimuli, and development of appropriate experimental paradigns for studying the localization of widely separated objects. The second task was to make careful quantitative measurements of the spatial and temporal properties of the system underlying localization of widely separated objects. It was found that many of the stimulus manipulations that are critical in determination of contrast detection thresholds have little or no effect on localization accuracy. The relative localization of widely separated objects is a highly robust visual ability. Those variations in localization accuracy with changes in the spatial and temporal parameters of the stimulus that were obtained could readily be modeled as natural extensions of the threshold properties. The final task of this project was testing of existing models of spatial ability that can be accounted for by current models of spatial vision. Specific extensions of the existing model were suggested by the data. Keywords: Human vision; Visual psychophysics; Relative spatial localization.