| Neural correlates of the continuous Wagon Wheel Illusion: a functional MRI study. | |
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MedLine Citation:
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PMID: 20336656 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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After prolonged viewing of a continuous periodic motion stimulus at frequencies around 10 Hz, observers experience a fleeting impression of reversed motion: the continuous Wagon Wheel Illusion (c-WWI). To account for this phenomenon it has been proposed that attentional mechanisms discretely sample motion information. Alternative accounts argue that the illusion relies on the spurious activation of motion detectors, which under the effect of adaptation could trigger a reversed percept. We investigated the neural correlates of the c-WWI using fMRI (3T). Subjects viewed a vertically bisected ring containing a radial grating unambiguously rotating at 10 Hz; they continuously reported the perceived motion direction within each half of the ring. The two halves always rotated in opposite directions, allowing us to separately explore illusory reversals occurring within each hemifield. Comparing BOLD activity during illusory (c-WWI) or real perceptual periods revealed systematic differences in right parietal regions, in addition to the right motion complex MT+. This activation pattern did not depend on the side on which the illusion occurred, and could not be accounted for by purely perceptual switch-related activity-known to encompass parietal regions during other bistable effects. This first characterization of the fMRI correlates of the c-WWI may have implications for the different theoretical explanations of the phenomenon. |
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Authors:
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Leila Reddy; Florence Rémy; Nathalie Vayssière; Rufin VanRullen |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Human brain mapping Volume: 32 ISSN: 1097-0193 ISO Abbreviation: Hum Brain Mapp Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9419065 Medline TA: Hum Brain Mapp Country: United States |
Other Details:
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Languages: eng Pagination: 163-70 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Wiley-Liss, Inc. |
Affiliation:
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Université de Toulouse, UPS, Centre de Recherche Cerveau et Cognition, Toulouse, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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