| Axis-of-motion affects direction discrimination, not speed discrimination. | |
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MedLine Citation:
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PMID: 10343802 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The motion of an object can be described by a single velocity vector, or equivalently, by direction and speed separately. Similarly, our ability to see subtle differences in the motion of two objects could be constrained by either a velocity-based sensory response, or separate sensory responses to direction and speed. To distinguish between these possibilities we investigated whether direction discrimination and speed discrimination were differentially affected by changes in the axis-of-motion. Psychophysical data from 12 naive observers indicated that direction discrimination depended on axis-of-motion, but speed discrimination did not. The difference suggests that a velocity-based sensory response is not the limiting factor on the two tasks. Instead, the results imply that the sensory response which constrains speed discrimination is at least partially independent from the sensory response which constrains direction discrimination. |
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Authors:
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N Matthews; N Qian |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 39 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1999 Jun |
Date Detail:
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Created Date: 1999-06-14 Completed Date: 1999-06-14 Revised Date: 2006-11-15 |
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: 2205-11 Citation Subset: IM; S |
Affiliation:
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Columbia University, Center for Neurobiology & Behavior, New York, NY 10032, USA. nestor@brahms.cpmc.columbia.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Differential Threshold
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physiology* Humans Motion Perception / physiology* Psychophysics Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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