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  Areas V1 and V2 show microsaccade-related 3-4 Hz covariation in gamma power and frequency

Lowet, E., Roberts, M. J., Bosman, C. A., Fries, P., & de Weerd, P. (2016). Areas V1 and V2 show microsaccade-related 3-4 Hz covariation in gamma power and frequency. European Journal of Neuroscience, 43(10), 1286-1296. doi:10.1111/ejn.13126.

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Lowet_2016_AreasV1AndV.pdf (Publisher version), 4MB
 
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2015
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Copyright © 2015 Federation of European Neuroscience Societies and John Wiley & Sons Ltd
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 Creators:
Lowet, Eric, Author
Roberts, M. J., Author
Bosman, Conrado A., Author
Fries, Pascal1, 2, Author                 
de Weerd, P., Author
Affiliations:
1Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Max Planck Society, Deutschordenstr. 46, 60528 Frankfurt, DE, ou_2074314              
2Fries Lab, Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Max Planck Society, Deutschordenstraße 46, 60528 Frankfurt, DE, ou_3381216              

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Free keywords: Animals *Cortical Synchronization *Gamma Rhythm Macaca mulatta Male Neural Pathways/physiology Photic Stimulation *Saccades Signal Processing, Computer-Assisted *Theta Rhythm Visual Cortex/*physiology *electrophysiology *gamma-band response *monkey *saccade *visual system
 Abstract: Neuronal gamma-band synchronization (25-90 Hz) in visual cortex appears sustained and stable during prolonged visual stimulation when investigated with conventional averages across trials. Yet, recent studies in macaque visual cortex have used single-trial analyses to show that both power and frequency of gamma oscillations exhibit substantial moment-by-moment variation. This has raised the question whether these apparently random variations might limit the functional role of gamma-band synchronization for neural processing. Here, we studied the moment-by-moment variation of gamma oscillation power and frequency, as well as inter-areal gamma synchronization by simultaneously recording local field potentials in V1 and V2 of two macaque monkeys. We additionally analyzed electrocorticographic (ECoG) V1 data from a third monkey. Our analyses confirm that gamma-band synchronization is not stationary and sustained but undergoes moment-by-moment variations in power and frequency. However, those variations are neither random and nor a possible obstacle to neural communication. Instead, the gamma power and frequency variations are highly structured, shared between areas, and shaped by a microsaccade-related 3-4 Hz theta rhythm. Our findings provide experimental support for the suggestion that cross-frequency coupling might structure and facilitate the information flow between brain regions. This article is protected by copyright. All rights reserved.

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 Dates: 2015-12-162016-05-15
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1111/ejn.13126
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Title: European Journal of Neuroscience
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Pages: - Volume / Issue: 43 (10) Sequence Number: - Start / End Page: 1286 - 1296 Identifier: -