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  Shifts of Gamma Phase across Primary Visual Cortical Sites Reflect Dynamic Stimulus-Modulated Information Transfer

Besserve, M., Lowe, S., Logothetis, N., Schölkopf, B., & Panzeri, S. (2015). Shifts of Gamma Phase across Primary Visual Cortical Sites Reflect Dynamic Stimulus-Modulated Information Transfer. PLoS Biology, 13(9), 1-29. doi:10.1371/journal.pbio.1002257.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-44B0-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-878F-6
Genre: Journal Article

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Besserve, M1, 2, Author              
Lowe, SC, Author
Logothetis, NK1, Author              
Schölkopf, B2, Author              
Panzeri, S3, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Dept. Empirical Inference, Max Planck Institute for Intelligent Systems, Max Planck Society, ou_1497647              
3Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Distributed neural processing likely entails the capability of networks to reconfigure dynamically the directionality and strength of their functional connections. Yet, the neural mechanisms that may allow such dynamic routing of the information flow are not yet fully understood. We investigated the role of gamma band (50–80 Hz) oscillations in transient modulations of communication among neural populations by using measures of direction-specific causal information transfer. We found that the local phase of gamma-band rhythmic activity exerted a stimulus-modulated and spatially-asymmetric directed effect on the firing rate of spatially separated populations within the primary visual cortex. The relationships between gamma phases at different sites (phase shifts) could be described as a stimulus-modulated gamma-band wave propagating along the spatial directions with the largest information transfer. We observed transient stimulus-related changes in the spatial configuration of phases (compatible with changes in direction of gamma wave propagation) accompanied by a relative increase of the amount of information flowing along the instantaneous direction of the gamma wave. These effects were specific to the gamma-band and suggest that the time-varying relationships between gamma phases at different locations mark, and possibly causally mediate, the dynamic reconfiguration of functional connections.

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 Dates: 2015-09
 Publication Status: Published online
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 Identifiers: DOI: 10.1371/journal.pbio.1002257
eDoc: e1002257
BibTex Citekey: BesserveLLSP2015
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Title: PLoS Biology
Source Genre: Journal
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Pages: - Volume / Issue: 13 (9) Sequence Number: - Start / End Page: 1 - 29 Identifier: -