| Speed and eccentricity tuning reveal a central role for the velocity-based cue to 3D visual motion. | |
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MedLine Citation:
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PMID: 20881201 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Two binocular cues are thought to underlie the visual perception of three-dimensional (3D) motion: a disparity-based cue, which relies on changes in disparity over time, and a velocity-based cue, which relies on interocular velocity differences. The respective building blocks of these cues, instantaneous disparity and retinal motion, exhibit very distinct spatial and temporal signatures. Although these two cues are synchronous in naturally moving objects, disparity-based and velocity-based mechanisms can be dissociated experimentally. We therefore investigated how the relative contributions of these two cues change across a range of viewing conditions. We measured direction-discrimination sensitivity for motion though depth across a wide range of eccentricities and speeds for disparity-based stimuli, velocity-based stimuli, and "full cue" stimuli containing both changing disparities and interocular velocity differences. Surprisingly, the pattern of sensitivity for velocity-based stimuli was nearly identical to that for full cue stimuli across the entire extent of the measured spatiotemporal surface and both were clearly distinct from those for the disparity-based stimuli. These results suggest that for direction discrimination outside the fovea, 3D motion perception primarily relies on the velocity-based cue with little, if any, contribution from the disparity-based cue. |
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Authors:
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Thaddeus B Czuba; Bas Rokers; Alexander C Huk; Lawrence K Cormack |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-09-29 |
Journal Detail:
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Title: Journal of neurophysiology Volume: 104 ISSN: 1522-1598 ISO Abbreviation: J. Neurophysiol. Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-11-03 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: United States |
Other Details:
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Languages: eng Pagination: 2886-99 Citation Subset: IM |
Affiliation:
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The University of Texas at Austin, Section of Neurobiology, Center for Perceptual Systems, Department of Psychology, Austin, TX 78712, USA. thad@mail.utexas.edu |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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