| A novel speed illusion involving expansion and rotation patterns. | |
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MedLine Citation:
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PMID: 8944287 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Using random dot stimuli well controlled for dot speed, we found that the moving features in expanding patterns appear to move faster than those in rotating patterns. The illusion is well correlated with the strength of the global motion signal. For example, in displays where the number of motion directions defining the patterns is reduced, the magnitude of the illusion decreases. Similarly, the strength of the effect diminishes as dot density is reduced. In patterns where only wedge-shaped segments of the stimuli are left exposed, the difference in perceived speed increases with the angular size of the wedge. Stimulus placement relative to the fixation point has little effect on the persistence of this phenomenon-expansion patterns appear to contain elements of greater speed, independent of stimulus eccentricity. These results argue against a local explanation for this perceptual illusion, suggesting that the global motion pattern of the stimulus, per se, is responsible. |
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Authors:
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B J Geesaman; N Qian |
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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, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 36 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1996 Oct |
Date Detail:
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Created Date: 1996-12-20 Completed Date: 1996-12-20 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: 3281-92 Citation Subset: IM; S |
Affiliation:
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Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139, USA. geesaman@geesaman.student.harvard.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Humans Motion Perception / physiology* Optical Illusions / physiology* Pattern Recognition, Visual / physiology Psychophysics Rotation Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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EY07492/EY/NEI NIH HHS; MH54125/MH/NIMH NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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