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  Spatial neuronal synchronization and the waveform of oscillations: Implications for EEG and MEG

Schaworonkow, N., & Nikulin, V. V. (2019). Spatial neuronal synchronization and the waveform of oscillations: Implications for EEG and MEG. PLoS Computational Biology, 15: 5. doi:10.1371/journal.pcbi.1007055.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-9DE8-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B337-5
Genre: Journal Article

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Schaworonkow, Natalie 1, 2, Author
Nikulin, Vadim V.3, 4, 5, 6, Author              
Affiliations:
1Frankfurt Institute for Advanced Studies, Goethe University, Frankfurt, Germany, ou_persistent22              
2Department of Neurology and Stroke, Hertie-Institute for Clinical Brain Research, Eberhard Karls University Tübingen, Germany, ou_persistent22              
3Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
4Centre for Cognition and Decision Making, National Research University Higher School of Economics, Moscow, Russia, ou_persistent22              
5Neurophysics Group, Department of Neurology, Charité University Medicine Berlin, Germany, ou_persistent22              
6Bernstein Center for Computational Neuroscience, Berlin, Germany, ou_persistent22              

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 Abstract: Neuronal oscillations are ubiquitous in the human brain and are implicated in virtually all brain functions. Although they can be described by a prominent peak in the power spectrum, their waveform is not necessarily sinusoidal and shows rather complex morphology. Both frequency and temporal descriptions of such non-sinusoidal neuronal oscillations can be utilized. However, in non-invasive EEG/MEG recordings the waveform of oscillations often takes a sinusoidal shape which in turn leads to a rather oversimplified view on oscillatory processes. In this study, we show in simulations how spatial synchronization can mask non-sinusoidal features of the underlying rhythmic neuronal processes. Consequently, the degree of non-sinusoidality can serve as a measure of spatial synchronization. To confirm this empirically, we show that a mixture of EEG components is indeed associated with more sinusoidal oscillations compared to the waveform of oscillations in each constituent component. Using simulations, we also show that the spatial mixing of the non-sinusoidal neuronal signals strongly affects the amplitude ratio of the spectral harmonics constituting the waveform. Finally, our simulations show how spatial mixing can affect the strength and even the direction of the amplitude coupling between constituent neuronal harmonics at different frequencies. Validating these simulations, we also demonstrate these effects in real EEG recordings. Our findings have far reaching implications for the neurophysiological interpretation of spectral profiles, cross-frequency interactions, as well as for the unequivocal determination of oscillatory phase.

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Language(s): eng - English
 Dates: 2018-09-112019-04-262019-05-14
 Publication Status: Published online
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 Identifiers: DOI: 10.1371/journal.pcbi.1007055
PMID: 31086368
Other: Epub ahead of print
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Funding organization : German Federal Ministry for Economic Affaires and Energy
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Funding organization : Quandt Foundation
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Funding program : Russian Academic Excellence Project 5–100
Funding organization : Ministry of Science and Higher Education of the Russian Federation
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Funding program : HSE Basic Research Program
Funding organization : Health and Safety Executive (HSE)

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Title: PLoS Computational Biology
Source Genre: Journal
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Publ. Info: San Francisco, CA : Public Library of Science
Pages: - Volume / Issue: 15 Sequence Number: 5 Start / End Page: - Identifier: ISSN: 1553-734X
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000017180_1