| Disparity-tuned population responses from human visual cortex. | |
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MedLine Citation:
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PMID: 21248120 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We used source imaging of visual evoked potentials to measure neural population responses over a wide range of horizontal disparities (0.5-64 arcmin). The stimulus was a central disk that moved back and forth across the fixation plane at 2 Hz, surrounded either by binocularly uncorrelated dots (disparity noise) or by correlated dots presented in the fixation plane. Both disk and surround were composed of dynamic random dots to remove coherent monocular information. Disparity tuning was measured in five visual regions of interest (ROIs) [V1, human middle temporal area (hMT+), V4, lateral occipital complex (LOC), and V3A], defined in separate functional magnetic resonance imaging scans. The disparity tuning functions peaked between 2 and 16 arcmin for both types of surround in each ROI. Disparity tuning in the V1 ROI was unaffected by the type of surround, but surround correlation altered both the amplitude and phase of the disparity responses in the other ROIs. Response amplitude increased when the disk was in front of the surround in the V3A and LOC ROIs, indicating that these areas encode figure-ground relationships and object convexity. The correlated surround produced a consistent phase lag at the second harmonic in the hMT+ and V4 ROIs without a change in amplitude, while in the V3A ROI, both phase and amplitude effects were observed. Sensitivity to disparity context is thus widespread in visual cortex, but the dynamics of these contextual interactions differ across regions. |
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Authors:
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Benoit R Cottereau; Suzanne P McKee; Justin M Ales; Anthony M Norcia |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of neuroscience : the official journal of the Society for Neuroscience Volume: 31 ISSN: 1529-2401 ISO Abbreviation: J. Neurosci. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-20 Completed Date: 2011-02-23 Revised Date: 2012-03-12 |
Medline Journal Info:
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Nlm Unique ID: 8102140 Medline TA: J Neurosci Country: United States |
Other Details:
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Languages: eng Pagination: 954-65 Citation Subset: IM |
Affiliation:
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The Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. cottereau@ski.org |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Brain Mapping Depth Perception / physiology Electroencephalography Evoked Potentials, Visual / physiology* Female Humans Magnetic Resonance Imaging Male Neurons / physiology* Photic Stimulation Visual Cortex / physiology* Visual Fields / physiology |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY018875/EY/NEI NIH HHS; R01 EY018875-03/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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