| Opposing effects of contextual surround in human early visual cortex revealed by functional magnetic resonance imaging with continuously modulated visual stimuli. | |
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MedLine Citation:
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PMID: 20203185 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Spatial context in vision has profound effects on neural responses and perception. Recent animal studies suggest that the effect of surround on a central stimulus can dramatically change its character depending on the contrast of the center stimulus, but such a drastic change has not been demonstrated in the human visual cortex. To examine the dependency of the surround effect on the contrast of the center stimulus, we conducted an functional magnetic resonance imaging experiment by using a low or a high contrast in the center region while the surround contrast was sinusoidally modulated between the two contrasts. We found that the blood oxygen level-dependent response in human V1 corresponding to the center region was differentially modulated by the surround contrast, depending crucially on the center contrast: whereas a suppressive effect was observed in conditions in which the center contrast was high, a facilitative effect was seen in conditions where the center contrast was low. |
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Authors:
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Satohiro Tajima; Masataka Watanabe; Chihiro Imai; Kenichi Ueno; Takeshi Asamizuya; Pei Sun; Keiji Tanaka; Kang Cheng |
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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: The Journal of neuroscience : the official journal of the Society for Neuroscience Volume: 30 ISSN: 1529-2401 ISO Abbreviation: J. Neurosci. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-05 Completed Date: 2010-05-05 Revised Date: - |
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: 3264-70 Citation Subset: IM |
Affiliation:
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Department of Complexity Science and Engineering, The University of Tokyo, Kashiwa-shi, Japan. tajima.s-iu@nhk.or.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Brain Mapping Contrast Sensitivity / physiology* Evoked Potentials, Visual / physiology Humans Magnetic Resonance Imaging Neural Inhibition / physiology Neuropsychological Tests Pattern Recognition, Visual / physiology* Photic Stimulation Regional Blood Flow / physiology Space Perception / physiology* Visual Cortex / anatomy & histology, physiology* Visual Pathways / anatomy & histology, physiology* |
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