| Extrinsic factors in the perception of bistable motion stimuli. | |
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MedLine Citation:
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PMID: 20433864 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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When viewing a drifting plaid stimulus, perceived motion alternates over time between coherent pattern motion and a transparent impression of the two component gratings. It is known that changing the intrinsic attributes of such patterns (e.g. speed, orientation and spatial frequency of components) can influence percept predominance. Here, we investigate the contribution of extrinsic factors to perception; specifically contextual motion and eye movements. In the first experiment, the percept most similar to the speed and direction of surround motion increased in dominance, implying a tuned integration process. This shift primarily involved an increase in dominance durations of the consistent percept. The second experiment measured eye movements under similar conditions. Saccades were not associated with perceptual transitions, though blink rate increased around the time of a switch. This indicates that saccades do not cause switches, yet saccades in a congruent direction might help to prolong a percept because (i) more saccades were directionally congruent with the currently reported percept than expected by chance, and (ii) when observers were asked to make deliberate eye movements along one motion axis, this increased percept reports in that direction. Overall, we find evidence that perception of bistable motion can be modulated by information from spatially adjacent regions, and changes to the retinal image caused by blinks and saccades. |
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Authors:
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Daniel H Baker; Erich W Graf |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-04-28 |
Journal Detail:
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Title: Vision research Volume: 50 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-31 Completed Date: - Revised Date: - |
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: 1257-65 Citation Subset: IM |
Copyright Information:
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2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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School of Psychology, University of Southampton, Highfield, Southampton SO171BJ, UK. d.h.baker1@aston.ac.uk |
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Descriptor/Qualifier:
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| Grant Support | |
ID/Acronym/Agency:
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BB/E012698/1//Biotechnology and Biological Sciences Research Council |
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