| Gamma in motion: Pattern reversal elicits stronger gamma-band responses than motion. | |
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MedLine Citation:
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PMID: 21130171 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Previous studies showed higher gamma-band responses (GBRs, ≈40Hz) of the electroencephalogram (EEG) for moving compared to stationary stimuli. However, it is unclear whether this modulation by motion reflects a special responsiveness of the GBR to the stimulus feature "motion," or whether GBR enhancements of similar magnitude can be elicited also by a salient change within a static stimulus that does not include motion. Therefore, we measured the EEG of healthy subjects watching stationary square wave gratings of high contrast that either started to move or reversed their black and white pattern shortly after their onset. The strong contrast change of the pattern reversal represented a salient but motionless change within the grating that was compared to the onset of the stationary grating and the motion onset. Induced and evoked GBRs were analyzed for all three display conditions. In order to assess the influenceof fixational eye movements on the induced GBRs, we also examined the time courses of microsaccade rates during the three display conditions. Amplitudes of both evoked and induced GBRs were stronger for pattern reversal than for motion onset. There was no significant amplitude difference between the onsets of the stationary and moving gratings. However, mean frequencies of the induced GBR were ~10Hz higher in response to the onsets of moving compared to stationary gratings. Furthermore, the modulations of the induced GBR did not parallel the modulations of microsaccade rate, indicating that our induced GBRs reflect neuronal processes. These results suggest that, within the gamma-band range, the encoding of moving gratings in early visual cortex is primarily based on an upward frequency shift, whereas contrast changes within static gratings are reflected by amplitude enhancement. |
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Authors:
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Nicole Naue; Daniel Strüber; Ingo Fründ; Jeanette Schadow; Daniel Lenz; Stefan Rach; Ursula Körner; Christoph S Herrmann |
Publication Detail:
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Type: Journal Article Date: 2010-12-02 |
Journal Detail:
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Title: NeuroImage Volume: 55 ISSN: 1095-9572 ISO Abbreviation: Neuroimage Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-02-08 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9215515 Medline TA: Neuroimage Country: United States |
Other Details:
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Languages: eng Pagination: 808-17 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Experimental Psychology, Carl-von-Ossietzky Universität, Ammerländer Heerstr. 114-118, 26129 Oldenburg, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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