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

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Probing associations between interbrain synchronization and interpersonal action coordination during guitar playing.

Viktor Müller¹, Ulman Lindenberger^1,2,3

¹Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany.

Annals of the New York Academy of Sciences

|September 12, 2021

Summary

Musicians' brain synchronization (interbrain synchronization) correlates with coordinated playing and music production. This brain-body interaction is key to successful ensemble performance, especially during active adjustment phases.

Keywords:

EEG hyperscanning brain-instrument interaction interpersonal action coordination intra- and interbrain synchronization phase alignment social interaction

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Area of Science:

Neuroscience
Music Cognition
Human-Computer Interaction

Background:

Ensemble playing requires complex brain-body coordination.
Interbrain phase synchronization is hypothesized to be crucial for musical interaction.

Purpose of the Study:

To investigate the relationship between interbrain synchronization and interpersonal action coordination in guitarists.
To analyze brain activity and musical output during duet performances.

Main Methods:

Electroencephalography (EEG) to record brain activity of guitarists.
Acoustic recordings of music produced during duet playing.
Phase synchronization algorithms applied to brain and acoustic data.

Main Results:

Synchronous brain activity strongly correlated with instrument sounds and behavioral play-onset synchrony.
Phase alignment and angular-linear correlation demonstrated a link between brain synchrony and timing coordination.
Correlation was particularly strong during the initial phase of the music, indicating active adjustment.

Conclusions:

Interbrain synchronization is a significant factor in interpersonal action coordination during ensemble music performance.
The findings highlight the importance of brain-body interactions in synchronized musical execution.
Methods analyzing synchronization offer insights into the mechanisms of coordinated action.