| Bridging the gap: global disparity processing in the human visual cortex. | |
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MedLine Citation:
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PMID: 22323636 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The human stereoscopic system is remarkable in its ability to utilize widely separated features as references to support fine depth discrimination. In a search for possible neural substrates of this ability, we recorded high-density EEG and used a distributed inverse technique to estimate population-level disparity responses in five ROIs: V1, V3A, hMT+, V4 and LOC. The stimulus was a central modulating disk surrounded by a correlated 'reference' annulus presented in the fixation plane. We varied a gap separating the disk from the annulus parametrically from 0 to 5.5 degrees as a test of long-range disparity integration. In the V1, LOC and hMT+ ROIs, the responses with gaps larger than 0.5 degrees were equal to those obtained in a control condition where the surround was composed of uncorrelated noise (no reference). By contrast, in the V4 and V3A ROIs, responses with gaps as large as 5.5 degrees were still significantly higher than the control. As a test of the spatial distribution of the disparity-reference information, we manipulated the properties of the stimulus by placing noise between the center and the surround or throughout the surround. The V3A ROI was particularly sensitive to disparity noise between the center and annulus regions, suggesting an important contribution of disparity edge detectors in this ROI. |
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Authors:
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Benoit R Cottereau; Susanne P McKee; Anthony M Norcia |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-8 |
Journal Detail:
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Title: Journal of neurophysiology Volume: - ISSN: 1522-1598 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Stanford University. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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