| The relative sensitivities of sensory and motor fusion to small binocular disparities. | |
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MedLine Citation:
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PMID: 11412887 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Horizontal binocular disparity is the fundamental stimulus for both fusional vergence and stereopsis, but whether common disparity-sensitive mechanisms are involved in both responses is unknown. To determine whether the sensitivities of motor and sensory fusion are interdependent, we studied vergence eye movements and depth discrimination, using stimuli with haplopic binocular disparities, in subjects with normal stereopsis and in subjects with mild to severe stereoanomalies. Our results showed that the subjects' disparity discrimination functions varied from nearly perfect discrimination to chance performance for all of the experimental stimuli. Their sensory functions did not necessarily predict the shape of their motor fusion functions, but in most cases were correlated with the subject's fixation disparities. The results support the conclusion that the stereoanomalies and vergence anomalies that previously have been described for coarse binocular disparities also extend to the small, haplopic binocular disparities. The independence of the response properties of sensory and motor fusion suggests that neural pathways for sensory and motor fusion separate after the initial disparity-selective mechanisms in primary visual cortex. |
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Authors:
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P Fredenburg; R S Harwerth |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 41 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2001 Jul |
Date Detail:
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Created Date: 2001-06-19 Completed Date: 2001-07-26 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 1969-79 Citation Subset: IM |
Affiliation:
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College of Optometry, University of Houston, 77204-6052, Houston, TX, USA. patricia.fredenburg@pdg.net |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Depth Perception
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physiology Discrimination (Psychology) / physiology Eye Movements / physiology Female Fixation, Ocular / physiology Humans Male Perceptual Disorders / physiopathology Psychometrics Vision Disparity / physiology* Visual Pathways / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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P30 EY07551/EY/NEI NIH HHS; R01 EY01139/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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