| Signals in macaque striate cortical neurons that support the perception of glass patterns. | |
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MedLine Citation:
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PMID: 12223588 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Glass patterns are texture stimuli made by pairing randomly placed dots with partners at specific offsets. The strong percept of global form that arises from the sparse local orientation cues has made these patterns the subject of psychophysical investigations, yet neuronal responses to Glass patterns have not been studied. We measured the responses of neurons in macaque striate cortex (V1) to dynamic, translational Glass patterns as a function of dot separation and dot-pair orientation. Responses were selective, but were on average more than an order of magnitude weaker than responses to sinusoidal gratings. Response and selectivity were greatest when the dot-pair orientation matched that of the preferred grating and when dot separation was between one-quarter and one-half of the spatial period of the optimal grating; changing the dot-pair separation or inverting the contrast of one of the dots radically changed the orientation selectivity. We computed the expected responses for a receptive field model to translational Glass patterns and found that the complexity of our V1 tuning curves could be understood in terms of the responses of linear filters to pairs of dots. This modeling connects our understanding of V1 receptive fields as rectified, quasi-linear filters with results from psychophysical studies of Glass patterns. Our results provide a basis for studying how subsequent visual areas integrate weak, local signals into global form percepts. |
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Authors:
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Matthew A Smith; Wyeth Bair; J Anthony Movshon |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of neuroscience : the official journal of the Society for Neuroscience Volume: 22 ISSN: 1529-2401 ISO Abbreviation: J. Neurosci. Publication Date: 2002 Sep |
Date Detail:
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Created Date: 2002-09-11 Completed Date: 2002-10-03 Revised Date: 2007-11-14 |
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: 8334-45 Citation Subset: IM |
Affiliation:
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Center for Neural Science, New York University, New York, New York 10003, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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physiology* Animals Macaca fascicularis Macaca nemestrina Neural Conduction / physiology Neurons / physiology* Orientation / physiology Pattern Recognition, Visual / physiology* Photic Stimulation / methods Signal Processing, Computer-Assisted Visual Cortex / cytology, physiology* |
| Grant Support | |
ID/Acronym/Agency:
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EY02017/EY/NEI NIH HHS; T32-7136//PHS HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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