Electrophysiological signatures of intentional social coordination in the 10–12 Hz range

Naeem, Muhammad, Prasad, Girijesh, Watson, David R and Kelso, J A Scott (2012) Electrophysiological signatures of intentional social coordination in the 10–12 Hz range. NeuroImage, 59 (2). pp. 1795-1803. ISSN 1053-8119

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This study sought to investigate the effects of manipulating social coordination on brain synchronization/ de-synchronization in the mu band. Mu activation is associated with understanding and coordinating motor acts and may play a key role in mediating social interaction. Members of a dyad were required to interact with one another in a rhythmic finger movement coordination task under various instructions:
intrinsic where each member of the dyad was instructed to maintain their own and ignore their partner's
movement; in-phase where they were asked to synchronize with their partner's movement; and anti-phase
where they were instructed to syncopate with their partner's movement. EEG and movement data were
recorded simultaneously from both subjects during all three tasks and a control condition. Log power ratios
of EEG activity in the active conditions versus control were used to assess the effect of task context on
synchronization/de-synchronization in the mu spectral domain.
Results showed clear and systematic modulation of mu band activity in the 10–12 Hz range as a function of
coordination context. In the left hemisphere general levels of alpha-mu suppression increased
progressively as one moved from intrinsic through in-phase to anti-phase contexts but with no specific
central–parietal focus. In contrast the right hemisphere displayed context-specific changes in the central–
parietal region. The intrinsic condition showed a right synchronization which disappeared with the in-phase
context even as de-synchronization remained greater in the left hemisphere. Anti-phase was associated
with larger mu suppression in the right in comparison with left at central–parietal region. Such
asymmetrical changes were highly correlated with changing behavioral dynamics.
These specific patterns of activation and deactivation of muactivity suggest that localized neural circuitry in right
central–parietal regionsmediates howindividuals interpret themovements of others in the context of their own
actions. A right sided mechanism in the 10–12 Hz range appears to be involved in integrating the mutual
information among the members of a dyad that enables the dynamics of social interaction to unfold in time.

Item Type: Article
Schools and Departments: Brighton and Sussex Medical School > Neuroscience
Subjects: R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry
Depositing User: Parisa Rafizadeh-Farahani
Date Deposited: 10 Aug 2016 10:13
Last Modified: 02 Jul 2019 18:01
URI: http://sro.sussex.ac.uk/id/eprint/62321

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