| Directional anisotropies reveal a functional segregation of visual motion processing for perception and action. | |
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MedLine Citation:
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PMID: 12670428 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Human exhibits an anisotropy in direction perception: discrimination is superior when motion is around horizontal or vertical rather than diagonal axes. In contrast to the consistent directional anisotropy in perception, we found only small idiosyncratic anisotropies in smooth pursuit eye movements, a motor action requiring accurate discrimination of visual motion direction. Both pursuit and perceptual direction discrimination rely on signals from the middle temporal visual area (MT), yet analysis of multiple measures of MT neuronal responses in the macaque failed to provide evidence of a directional anisotropy. We conclude that MT represents different motion directions uniformly, and subsequent processing creates a directional anisotropy in pathways unique to perception. Our data support the hypothesis that, at least for visual motion, perception and action are guided by inputs from separate sensory streams. The directional anisotropy of perception appears to originate after the two streams have segregated and downstream from area MT. |
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Authors:
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Anne K Churchland; Justin L Gardner; I han Chou; Nicholas J Priebe; Stephen G Lisberger |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Neuron Volume: 37 ISSN: 0896-6273 ISO Abbreviation: Neuron Publication Date: 2003 Mar |
Date Detail:
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Created Date: 2003-04-02 Completed Date: 2003-05-01 Revised Date: 2009-10-01 |
Medline Journal Info:
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Nlm Unique ID: 8809320 Medline TA: Neuron Country: United States |
Other Details:
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Languages: eng Pagination: 1001-11 Citation Subset: IM |
Affiliation:
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Howard Hughes Medical Institute, Department of Physiology, University of California, San Francisco, San Francisco, CA 94143, USA. anja@phy.ucsf.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Anisotropy Discrimination (Psychology) Eye Movements Humans Macaca Motion* Neurons / physiology Temporal Lobe / physiology Visual Perception / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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//Howard Hughes Medical Institute |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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