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Related Experiment Video

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How to Calculate and Validate Inter-brain Synchronization in a fNIRS Hyperscanning Study
05:33

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Published on: September 8, 2021

Inter-brain synchronization during social interaction.

Guillaume Dumas1, Jacqueline Nadel, Robert Soussignan

  • 1Université Pierre et Marie Curie-Paris 6, Centre de Recherche de l'Institut du Cerveau et de la Moelle épinière, UMR-S975, Paris, France. guillaume.dumas@upmc.fr

Plos One
|September 3, 2010
PubMed
Summary
This summary is machine-generated.

Brain synchrony in the alpha-mu band between right centroparietal regions emerges during social interaction. This neural synchronization supports interactional synchrony and reflects behavioral negotiation between partners.

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Area of Science:

  • Neuroscience
  • Social Interaction
  • Cognitive Science

Background:

  • Social interactions involve continuous mutual adaptation between participants.
  • Interactional synchrony arises from this behavioral negotiation, where roles of model and imitator are exchanged.
  • The underlying neural mechanisms of this synchrony, particularly interbrain synchronization, remain largely unexplored.

Purpose of the Study:

  • To investigate the extent of oscillatory synchronization between two brains during social interaction.
  • To explore the neural basis of interactional synchrony during spontaneous imitation.
  • To identify brain regions and frequency bands involved in interbrain synchronization during social negotiation.

Main Methods:

  • Utilized dual-video and dual-electroencephalography (EEG) hyperscanning to record 9 dyads (18 participants).
  • Participants engaged in spontaneous imitation of hand movements.
  • Employed nonlinear techniques to analyze interactional synchrony, turn-taking, and interbrain synchronization in EEG data.

Main Results:

  • Interactional synchrony correlated with the emergence of an interbrain synchronizing network in the alpha-mu frequency band.
  • This synchronization network was localized between the right centroparietal regions, acting as symmetrical functional hubs.
  • Neural synchronization became asymmetrical in higher frequency bands, potentially reflecting top-down modulation related to model/imitator roles.

Conclusions:

  • Right centroparietal regions play a crucial, symmetrical role in establishing interbrain synchrony during social interaction.
  • Alpha-mu band synchronization is a neural correlate of interactional synchrony and behavioral negotiation.
  • Asymmetrical synchronization in higher frequencies may indicate distinct neural processes related to role differentiation in social dynamics.