| Direction repulsion in unfiltered and ring-filtered Julesz textures. | |
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MedLine Citation:
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PMID: 11281098 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Perceived directions of motion were measured for each of two superposed two-dimensional dynamic random patterns consisting of unfiltered or ring-filtered dense random-check (Julesz) textures. One pattern always moved in a cardinal direction (up, down, left, or right), and the other texture always moved in an oblique direction separated from the cardinal component by 20 degrees-80 degrees. Several cardinal/oblique speed ratios were tested. In Experiment 1, the textures were unfiltered. In Experiment 2, the textures were ring filtered and had the same center frequency (1, 2, or 4 cpd). In Experiment 3, a 1-cpd ring-filtered texture was paired with a 2-, 4-, or 8-cpd texture. Subjects consistently misperceived the directions of component motion in these experiments; the angular separation of movement of the two textures was perceptually exaggerated, a phenomenon referred to as direction repulsion (Marshak & Sekuler, 1979). The results show that (1) direction repulsion occurs across at least a fourfold range of spatial frequencies and a sixfold range of speed ratios, (2) direction repulsion varies systematically with speed ratio, and (3) across most conditions, direction repulsion is anisotropic--direction repulsion is more evident in the oblique directions than in the cardinal directions. These findings suggest that the spatiotemporal range of inhibitory interactions involved in motion transparency is much greater than previously appreciated. |
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Authors:
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D T Lindsey |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Perception & psychophysics Volume: 63 ISSN: 0031-5117 ISO Abbreviation: Percept Psychophys Publication Date: 2001 Feb |
Date Detail:
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Created Date: 2001-04-02 Completed Date: 2001-05-03 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0200445 Medline TA: Percept Psychophys Country: United States |
Other Details:
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Languages: eng Pagination: 226-40 Citation Subset: IM |
Affiliation:
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Department of Psychology, Ohio State University, Mansfield, OH 44906, USA. lindsey.43@osu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acceleration Anisotropy Attention Field Dependence-Independence Humans Motion Perception* Optical Illusions* Orientation* Pattern Recognition, Visual* Psychophysics |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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