| Assessment of depth perception using psychophysical thresholds and stereoscopically evoked brain activity. | |
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MedLine Citation:
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PMID: 19856007 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Dynamic random-dot stereograms (dRDS) elicit brain activity generated exclusively by cortical neurons sensitive to binocular horizontal disparity. We studied 20 adults with stereovision deficiency but otherwise normal vision. Psychophysical thresholds were determined with static RDS and with the three-rod experiment. VEP was recorded from seven occipital channels. Stimuli were presented on a monitor by dRDS as stereoscopic checkerboard patterns that moved in depth with 8 depth reversals per second. Horizontal disparity ranged from 7 to 24.5 min of arc. Stimuli were displayed at the center, or in the left or right half field. We determined electrophysiological thresholds as well as the disparity where largest responses occurred. Subjective and electrophysiological thresholds showed a significant positive correlation. In addition, the right visual field was more sensitive to dRDS stimuli than other locations. Squint angle was related to the disparity thresholds. Our data illustrate correlations between clinical symptoms, perceptual deficiency, and VEP parameters. |
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Authors:
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Wolfgang Skrandies |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-10-24 |
Journal Detail:
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Title: Documenta ophthalmologica. Advances in ophthalmology Volume: 119 ISSN: 1573-2622 ISO Abbreviation: Doc Ophthalmol Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2010-01-21 Completed Date: 2010-03-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370667 Medline TA: Doc Ophthalmol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 209-16 Citation Subset: IM |
Affiliation:
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Institute of Physiology, Justus-Liebig University, Aulweg 129, 35392, Giessen, Germany. wolfgang.skrandies@physiologie.med.uni-giessen.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Brain / physiopathology* Depth Perception / physiology* Evoked Potentials, Visual Female Humans Male Neurons / physiology Perceptual Disorders / physiopathology Photic Stimulation Psychophysics Sensory Thresholds Strabismus / physiopathology Vision Disparity Vision, Binocular / physiology Visual Fields |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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