| Differences in gamma frequencies across visual cortex restrict their possible use in computation. | |
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MedLine Citation:
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PMID: 20826318 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Neuronal oscillations in the gamma band (30-80 Hz) have been suggested to play a central role in feature binding or establishing channels for neural communication. For these functions, the gamma rhythm frequency must be consistent across neural assemblies encoding the features of a stimulus. Here we test the dependence of gamma frequency on stimulus contrast in V1 cortex of awake behaving macaques and show that gamma frequency increases monotonically with contrast. Changes in stimulus contrast over time leads to a reliable gamma frequency modulation on a fast timescale. Further, large stimuli whose contrast varies across space generate gamma rhythms at significantly different frequencies in simultaneously recorded neuronal assemblies separated by as little as 400 microm, making the gamma rhythm a poor candidate for binding or communication, at least in V1. Instead, our results suggest that the gamma rhythm arises from local interactions between excitation and inhibition. |
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Authors:
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Supratim Ray; John H R Maunsell |
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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: Neuron Volume: 67 ISSN: 1097-4199 ISO Abbreviation: Neuron Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-09 Completed Date: 2010-10-01 Revised Date: 2011-07-25 |
Medline Journal Info:
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Nlm Unique ID: 8809320 Medline TA: Neuron Country: United States |
Other Details:
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Languages: eng Pagination: 885-96 Citation Subset: IM |
Copyright Information:
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2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Neurobiology and Howard Hughes Medical Institute, Harvard Medical School, 220 Longwood Avenue, Boston, MA 02115, USA. supratim_ray@hms.harvard.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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physiology Animals Brain Mapping* Contrast Sensitivity / physiology Electroencephalography* Entropy Evoked Potentials, Visual / physiology* Eye Movements / physiology Macaca mulatta Male Neurons / physiology* Numerical Analysis, Computer-Assisted* Pattern Recognition, Visual / physiology Photic Stimulation / methods Time Factors Visual Cortex / cytology, physiology* Visual Pathways / physiology Wakefulness |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY005911-26/EY/NEI NIH HHS; R01EY005911/EY/NEI NIH HHS; //Howard Hughes Medical Institute; //Howard Hughes Medical Institute |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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