| A reduction in the number of directionally selective neurons extends the spatial limit for global motion perception. | |
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MedLine Citation:
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PMID: 7863612 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Dynamic random-dot targets were used to study neural mechanisms underlying motion perception. Performance of cats with severely reduced numbers of cortical directionally selective neurons (reduced DS) was compared to that of normal animals. We assessed the spatial properties of the residual motion mechanism by measuring direction discriminations at various dot displacements. At small displacements, reduced DS cats' motion integration thresholds for opposite direction discrimination were nearly normal. At larger displacements, their thresholds surpassed those of normal cats and their upper displacement limit (dmax) was increased by 0.35 deg. The accuracy of direction discrimination was reduced at small displacements, but at larger displacements direction difference thresholds of reduced DS cats approached or surpassed those of normals. These data were compared to the performance of humans who showed an extension of dmax for peripherally viewed targets. The data support the hypothesis that expansion in spatial scale of the motion mechanism may contribute to extension of dmax. Additional support for this hypothesis is provided by a modified direction discriminating line-element model. The model also suggests that changes in sampling of motion mechanisms in the reduced DS system may play a role. |
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Authors:
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K K Rudolph; V P Ferrera; T Pasternak |
Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 34 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1994 Dec |
Date Detail:
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Created Date: 1995-03-17 Completed Date: 1995-03-17 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: 3241-51 Citation Subset: IM; S |
Affiliation:
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Department of Psychology, University of Rochester, NY 14627-0270. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cats Discrimination (Psychology) / physiology Humans Mathematics Models, Biological Motion Perception / physiology* Pattern Recognition, Visual / physiology* Psychophysics Sensory Deprivation / physiology Sensory Thresholds / physiology Time Factors Visual Cortex / physiology* Visual Fields |
| Grant Support | |
ID/Acronym/Agency:
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EY01319/EY/NEI NIH HHS; EY06175/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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