Functional dissociation of brain rhythms in social coordination

Naeem, Muhammad, Prasad, Girijesh, Watson, David R and Kelso, J A Scott (2012) Functional dissociation of brain rhythms in social coordination. Clinical Neurophysiology, 123 (9). pp. 1789-1797. ISSN 1388-2457

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Objectives: The goal of this research was to investigate sub-band modulations in the mu domain in dyads
performing different social coordination tasks.
Methods: Dyads of subjects performed rhythmic finger movement under three different task conditions:
intrinsic – maintain self-produced movement while ignoring their partner’s movement; in-phase –
synchronize with partner; and anti-phase – maintain syncopation with partner. Movement profiles of
the dyads were used to estimate a synchronization index (SI) to verify differences in coordination according
to each task. EEG was recorded during task performance and at baseline (partner’s actions hidden
from view). Log power ratios of mu band activity (active against baseline) were used to assess the relative
levels of synchronization/de-synchronization in both the upper and lower mu bands.
Results: Results confirm a functional dissociation of lower (8–10 Hz) and upper (10–12 Hz) mu bands in
social coordination tasks. Lower mu band activity was independent of specific modulations across tasks
and hemispheric preferences. Upper mu band activity was sensitive to coordination tasks and exhibited
marked differences between the hemispheres. Accentuated de-synchronization of right relative to left
hemisphere in the anti-phase task appeared related to the greater demand of perceptual-motor discrimination.
Left hemisphere de-synchronization in both in-phase and anti-phase coordination was interpreted
in terms of successful production of imitation. Right hemisphere synchronization in the
intrinsic task was interpreted as inhibition of an imitative response tendency.
Conclusions: Functional dissociation of lower and upper mu band and hemispheric preferences exists in
real-time social coordination.

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 10:09
Last Modified: 26 Sep 2017 12:41

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