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Sci Rep. 2017 Jun 23;7(1):4190. doi: 10.1038/s41598-017-04464-4.

Brain-to-brain entrainment: EEG interbrain synchronization while speaking and listening.

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BCBL - Basque Center on Cognition Brain and Language, 20009, Donostia, Spain.
BCBL - Basque Center on Cognition Brain and Language, 20009, Donostia, Spain.
Ikerbasque, Basque Foundation for Science, 48011, Bilbao, Spain.
Departamento de Filología Vasca, EHU/UPV, 48015, Bilbao, Spain.


Electroencephalographic hyperscanning was used to investigate interbrain synchronization patterns in dyads of participants interacting through speech. Results show that brain oscillations are synchronized between listener and speaker during oral narratives. This interpersonal synchronization is mediated in part by a lower-level sensory mechanism of speech-to-brain synchronization, but also by the interactive process that takes place in the situation per se. These results demonstrate the existence of brain-to-brain entrainment which is not merely an epiphenomenon of auditory processing, during listening to one speaker. The study highlights the validity of the two-person neuroscience framework for understanding induced brain activity, and suggests that verbal information exchange cannot be fully understood by examining the listener's or speaker's brain activity in isolation.

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