| The aperture problem in contoured stimuli. | |
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MedLine Citation:
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PMID: 19810794 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A moving object elicits responses from V1 neurons tuned to a broad range of locations, directions, and spatiotemporal frequencies. Global pooling of such signals can overcome their intrinsic ambiguity in relation to the object's direction/speed (the "aperture problem"); here we examine the role of low-spatial frequencies (SF) and second-order statistics in this process. Subjects made a 2AFC fine direction-discrimination judgement of 'naturally' contoured stimuli viewed rigidly translating behind a series of small circular apertures. This configuration allowed us to manipulate the scene by randomly switching which portion of the stimulus was presented behind each aperture or by occluding certain spatial frequency bands. We report that global motion integration is (a) largely insensitive to the second-order statistics of such stimuli and (b) is rigidly broadband even in the presence of a disrupted low SF component. |
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Authors:
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David Kane; Peter J Bex; Steven C Dakin |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-09-16 |
Journal Detail:
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Title: Journal of vision Volume: 9 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2009 |
Date Detail:
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Created Date: 2009-10-08 Completed Date: 2009-12-15 Revised Date: 2010-09-28 |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: 13.1-17 Citation Subset: IM |
Affiliation:
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UCL Institute of Ophthalmology, University College London, London EC1V 9EL, United Kingdom. d.kane@ucl.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Discrimination (Psychology) Humans Motion Perception / physiology* Orientation Photic Stimulation / methods* Psychophysics Space Perception / physiology* Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY018664-02/EY/NEI NIH HHS; R01 EY019281-02/EY/NEI NIH HHS; //Wellcome Trust |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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