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  Bilateral gamma/delta transcranial alternating current stimulation affects interhemispheric speech sound integration

Preisig, B., Sjerps, M. J., Hervais-Adelman, A., Kösem, A., Hagoort, P., & Riecke, L. (2020). Bilateral gamma/delta transcranial alternating current stimulation affects interhemispheric speech sound integration. Journal of Cognitive Neuroscience, 32(7), 1242-1250. doi:10.1162/jocn_a_01498.

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Preisig, Basil1, 2, 3, Author           
Sjerps, Matthias J.1, 2, Author           
Hervais-Adelman, Alexis3, Author           
Kösem, Anne4, Author           
Hagoort, Peter1, 2, Author           
Riecke, Lars5, Author
Affiliations:
1Neurobiology of Language Department, MPI for Psycholinguistics, Max Planck Society, ou_792551              
2Donders Institute for Brain, Cognition and Behaviour, External Organizations, ou_55236              
3University of Zurich, Zurich, Switzerland, ou_persistent22              
4Université Claude Bernard, Lyon, France, ou_persistent22              
5Maastricht University, Maastricht, The Netherlands, ou_persistent22              

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 Abstract: Perceiving speech requires the integration of different speech cues, that is, formants. When the speech signal is split so that different cues are presented to the right and left ear (dichotic listening), comprehension requires the integration of binaural information. Based on prior electrophysiological evidence, we hypothesized that the integration of dichotically presented speech cues is enabled by interhemispheric phase synchronization between primary and secondary auditory cortex in the gamma frequency band. We tested this hypothesis by applying transcranial alternating current stimulation (TACS) bilaterally above the superior temporal lobe to induce or disrupt interhemispheric gamma-phase coupling. In contrast to initial predictions, we found that gamma TACS applied in-phase above the two hemispheres (interhemispheric lag 0°) perturbs interhemispheric integration of speech cues, possibly because the applied stimulation perturbs an inherent phase lag between the left and right auditory cortex. We also observed this disruptive effect when applying antiphasic delta TACS (interhemispheric lag 180°). We conclude that interhemispheric phase coupling plays a functional role in interhemispheric speech integration. The direction of this effect may depend on the stimulation frequency.

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Language(s): eng - English
 Dates: 2019-11-042020-06
 Publication Status: Issued
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1162/jocn_a_01498
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Title: Journal of Cognitive Neuroscience
Source Genre: Journal
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Publ. Info: Cambridge, MA : MIT Press Journals
Pages: - Volume / Issue: 32 (7) Sequence Number: - Start / End Page: 1242 - 1250 Identifier: ISSN: 0898-929X
CoNE: https://pure.mpg.de/cone/journals/resource/991042752752726