title: Can dancers suppress the haptically mediated interpersonal entrainment during rhythmic sway?
abstract: Interpersonal entrainment emerges spontaneously when partners performing rhythmic movements together exchange sensory feedback about the other's movements. In this study, we asked whether couples of expert dancers, non-dancers and mixed couples can suppress the spontaneous haptically mediated inter-personal entrainment when their rhythmic sway is paced by differing metronome tempos. Fifty-four young participants formed three types of couples: nine dancer couples, consisting of individuals with at least eight years systematic practice in traditional Greek dance; nine non-dancer couples, consisting of individuals with no prior experience in dance and nine mixed couples, consisting of one dancer and one novice partner. Partners swayed rhythmically for 60 s, at different pacing frequencies (one at 0.25 Hz and the other at 0.35 Hz) under three haptic contact conditions: no contact between them; light fingertip touch established in the 2nd trial segment (30 s); and light fingertip touch released in the 2nd trial segment (30 s). Spectral analysis of the antero-posterior center of pressure displacement revealed that light touch increased the deviation of the dominant from the target (pacing) sway frequency, decreased the proportion of the signal's power at the target frequency and increased the coherence between the partners' sway signals (inter-personal coherence). These effects were specific to the mixed group whereas touch interference was weaker in non-dancers and absent in dancers. In addition, the coherence between the trial segments (intra-personal coherence) significantly decreased with touch only for the non-dancer while it remained unchanged for the dancer partner of the mixed group suggesting that the dancer was leading the non-dancer partner. It is concluded that systematic practice with traditional dance can modulate the spontaneous tendency towards haptically mediated interpersonal entrainment.
authors.affiliation: Laboratory of Motor Control and Learning, School of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Sofianidis
authors.affiliation: Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Birmingham, United Kingdom.
authors.forename: Mark T
authors.initials: MT
authors.lastname: Elliott
authors.affiliation: Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Birmingham, United Kingdom.
authors.forename: Alan M
authors.initials: AM
authors.lastname: Wing
authors.affiliation: Laboratory of Motor Control and Learning, School of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece. Electronic address: vaso1@phed.auth.gr.
authors.forename: Vassilia
authors.initials: V
authors.lastname: Hatzitaki
mesh_terms: D000328:Adult; D003615:Dancing / Q000502:physiology*; D056228:Feedback, Sensory / Q000502:physiology*; D005260:Female; D005385:Fingers / Q000502:physiology; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D009068:Movement / Q000502:physiology*; D014110:Touch / Q000502:physiology*; D055698:Touch Perception / Q000502:physiology*; D055815:Young Adult
keywords: Dance; Interpersonal coordination; Leader–follower; Light touch; Metronome; Motor expertise