| Speed tuning of direction repulsion describes an inverted U-function. | |
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MedLine Citation:
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PMID: 12826108 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Direction repulsion describes the phenomenon in which observers typically overestimate the direction difference between two superimposed motions moving in different directions (Marshak & Sekuler, Science 205 (1979) 1399). Previous research has found that, when a relatively narrow range of distractor speeds is considered, direction repulsion of a target motion increases monotonically with increasing speed of the distractor motion. We sought to obtain a more complete measurement of this speed-tuning function by considering a wider range of distractor speeds than has previously been used. Our results show that, contrary to previous reports, direction repulsion as a function of distractor speed describes an inverted U-function. For a target of 2.5 deg/s, we demonstrate that the attenuation of repulsion magnitude with high-speed disractors can be largely explained in terms of the reduced apparent contrast of the distractor. However, when we reduce target motion speed, this no longer holds. When considered from the perspective of Edwards et al.'s (Edwards, Badcock, & Smith, Vision Research 38 (1998) 1573) two global-motion channels, our results suggest that direction repulsion is speed dependent when the distractor and target motions are processed by different global-motion channels, but is not speed dependent when both motions are processed by the same, high-speed channel. The implications of these results for models of direction repulsion are discussed. |
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Authors:
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William Curran; Christopher P Benton |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Vision research Volume: 43 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2003 Aug |
Date Detail:
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Created Date: 2003-06-26 Completed Date: 2003-08-12 Revised Date: 2004-11-17 |
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: 1847-53 Citation Subset: IM |
Affiliation:
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School of Psychology, Queen's University of Belfast, Belfast BT7 1NN, UK. w.curran@qub.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Ocular
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physiology Humans Motion Perception / physiology* Observer Variation Optical Illusions / physiology Photic Stimulation / methods Reaction Time |
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