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  Modulation of somatosensory alpha rhythm by transcranial alternating current stimulation at mu-frequency

Gundlach, C., Müller, M. M., Nierhaus, T., Villringer, A., & Sehm, B. (2017). Modulation of somatosensory alpha rhythm by transcranial alternating current stimulation at mu-frequency. Frontiers in Human Neuroscience, 11: 432. doi:10.3389/fnhum.2017.00432.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-E66C-B Version Permalink: http://hdl.handle.net/21.11116/0000-0003-5ECD-E
Genre: Journal Article

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 Creators:
Gundlach, Christopher1, 2, Author              
Müller, Matthias M.2, Author
Nierhaus, Till1, 3, Author              
Villringer, Arno1, 4, 5, Author              
Sehm, Bernhard1, 5, Author              
Affiliations:
1Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
2Institute of Psychology, University of Leipzig, Germany, ou_persistent22              
3Center for Cognitive Neuroscience Berlin (CCNB), FU Berlin, Germany, ou_persistent22              
4Berlin School of Mind and Brain, Humboldt University Berlin, Germany, ou_persistent22              
5Clinic for Cognitive Neurology, University of Leipzig, Germany, ou_persistent22              

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Free keywords: Transcranial alternating current stimulation; tACS; mu-alpha; Brain oscillations; Electroencephalogram; EEG; Somatosensory cortex
 Abstract: Introduction: Transcranial alternating current stimulation (tACS) is emerging as an interventional tool to modulate different functions of the brain, potentially by interacting with intrinsic ongoing neuronal oscillations. Functionally different intrinsic alpha oscillations are found throughout the cortex. Yet it remains unclear whether tACS is capable of specifically modulating the somatosensory mu-rhythm in amplitude. Objectives: We used tACS to modulate mu-alpha oscillations in amplitude. When compared to sham stimulation we expected a modulation of mu-alpha oscillations but not visual alpha oscillations by tACS. Methods: Individual mu-alpha frequencies were determined in 25 participants. Subsequently, blocks of tACS with individual mu-alpha frequency and sham stimulation were applied over primary somatosensory cortex (SI). Electroencephalogram (EEG) was recorded before and after either stimulation or sham. Modulations of mu-alpha and, for control, visual alpha amplitudes were then compared between tACS and sham. Results: Somatosensory mu-alpha oscillations decreased in amplitude after tACS was applied at participants’ individual mu-alpha frequency. No changes in amplitude were observed for sham stimulation. Furthermore, visual alpha oscillations were not affected by tACS or sham, respectively. Conclusion: Our results demonstrate the capability of tACS to specifically modulate the targeted somatosensory mu-rhythm when the tACS frequency is tuned to the individual endogenous rhythm and applied over somatosensory areas. Our results are in contrast to previously reported amplitude increases of visual alpha oscillations induced by tACS applied over visual cortex. Our results may point to a specific interaction between our stimulation protocol and the functional architecture of the somatosensory system.

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Language(s): eng - English
 Dates: 2017-04-252017-08-142017-08-25
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3389/fnhum.2017.00432
PMID: 28890693
PMC: PMC5575435
Other: eCollection 2017
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Title: Frontiers in Human Neuroscience
  Abbreviation : Front Hum Neurosci
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Frontiers Research Foundation
Pages: - Volume / Issue: 11 Sequence Number: 432 Start / End Page: - Identifier: ISSN: 1662-5161
CoNE: https://pure.mpg.de/cone/journals/resource/1662-5161