| Perceived direction of plaid motion is not predicted by component speeds. | |
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MedLine Citation:
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PMID: 17187840 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It has been shown that the perceived direction of a plaid with components of unequal contrast is biased towards the direction of the higher-contrast component [Stone, L. S., Watson, A. B., & Mulligan, J. B. (1990). Effect of contrast on the perceived direction of a moving plaid. Vision Research 30, 1049-1067]. It was proposed that this effect is due to the influence of contrast on the perceived speed of the plaid components. This led to the conclusion that perceived plaid direction is computed by the intersection of constraints (IOC) of the perceived speed of the components rather than their physical speeds. We tested this proposal at a wider range of component speeds (2-16deg/s) than used previously, across which the effect of contrast on perceived speed is seen to reverse. We find that across this range, perceived plaid direction cannot be predicted either by a model which takes the IOC of physical or perceived component speed. Our results are consistent with an explanation of 2D motion perception proposed by [Bowns, L. (1996). Evidence for a feature tracking explanation of why Type II plaids move in the vector sum direction at short durations. Vision Research, 36, 3685-3694.] in which the motion of the zero-crossing edges of the features in the stimulus contribute to the perceived direction of motion. |
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Authors:
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Rebecca A Champion; Stephen T Hammett; Peter G Thompson |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-12-21 |
Journal Detail:
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Title: Vision research Volume: 47 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-01-23 Completed Date: 2007-03-29 Revised Date: 2007-08-13 |
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: 375-83 Citation Subset: IM |
Affiliation:
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Department of Psychology, Royal Holloway, University of London, Egham TW20 0EX, UK. r.a.champion@soton.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Contrast Sensitivity Humans Models, Psychological Motion Perception* Pattern Recognition, Visual* Photic Stimulation / methods Psychophysics |
| Grant Support | |
ID/Acronym/Agency:
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GR065624//Wellcome Trust |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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