Measuring mimicry: general corticospinal facilitation during observation of naturalistic behaviour

J. E. van Schaik, L. M. Sacheli, H. Bekkering, I. Toni, S. M. Aglioti

Research output: Contribution to journalArticle

Abstract

Mimicry of others' postures and behaviours forms an implicit yet indispensable component of social interactions. However, whereas numerous behavioural studies have investigated the occurrence of mimicry and its social sensitivity, the underlying neurocognitive mechanisms remain elusive. In this study, single-pulse transcranial magnetic stimulation was used to measure corticospinal facilitation during a naturalistic behaviour observation task adapted from the behavioural mimicry literature. Motor evoked potentials (MEPs) in participants' right hands were measured as they observed stimulus videos of a confederate describing photographs. MEPs were recorded while confederates were and were not carrying out hand and leg behaviours that also differed in spatial extent (i.e. large behaviours: face rubbing and leg crossing; small behaviours: finger tapping and foot bouncing). Importantly, the cover task instructions did not refer to the behaviours but instead required participants to focus on the confederates' photograph descriptions in order to later perform a recognition test. A general arousal effect was found, with higher MEPs during stimulus video observation than during a fixation-cross baseline, regardless of whether or not the confederate was carrying out a behaviour at the time of the pulse. When controlling for this general arousal effect, results showed that MEPs during observation of the larger two behaviours were significantly higher than the smaller two behaviours, irrespective of effector. Thus, using a controlled yet naturalistic paradigm, this study suggests that general sensorimotor arousal during social interactions could play a role in implicit behavioural mimicry.

Original languageEnglish
Pages (from-to)1828-1836
Number of pages9
JournalEuropean Journal of Neuroscience
Volume46
Issue number2
DOIs
Publication statusPublished - Jul 1 2017

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Motor Evoked Potentials
Arousal
Interpersonal Relations
Leg
Hand
Observation
Behavior Observation Techniques
Transcranial Magnetic Stimulation
Posture
Fingers
Foot

Keywords

  • motor evoked potentials
  • sensorimotor arousal
  • social interactions
  • transcranial magnetic stimulation

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Measuring mimicry : general corticospinal facilitation during observation of naturalistic behaviour. / van Schaik, J. E.; Sacheli, L. M.; Bekkering, H.; Toni, I.; Aglioti, S. M.

In: European Journal of Neuroscience, Vol. 46, No. 2, 01.07.2017, p. 1828-1836.

Research output: Contribution to journalArticle

van Schaik, J. E. ; Sacheli, L. M. ; Bekkering, H. ; Toni, I. ; Aglioti, S. M. / Measuring mimicry : general corticospinal facilitation during observation of naturalistic behaviour. In: European Journal of Neuroscience. 2017 ; Vol. 46, No. 2. pp. 1828-1836.
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