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Infant physiological activity and the early emergence of social communication

Jessica Bradshaw1, Drew H Abney2

  • 1Department of Psychology, University of South Carolina, Columbia, South Carolina, USA.

Developmental Psychobiology
|October 21, 2021
PubMed

Insights

Infant physiological regulation during social play, including respiratory sinus arrhythmia (RSA) and heart rate-defined attention, is linked to developing social-communication skills. Specifically, RSA suppression during caregiver interactions predicts later communication abilities.

Area of Science:

  • Developmental Psychology
  • Infant Behavior
  • Neuroscience

Background:

  • Early social engagement is crucial for development.
  • Physiological regulation supports social interaction and communication skill acquisition in infants.
  • Understanding infant physiological responses during social interactions is key.

Purpose of the Study:

  • To investigate the role of physiological activity during social play in early social-communication skills.
  • To examine respiratory sinus arrhythmia (RSA) and heart rate-defined attention as predictors of social-communication development.
  • To assess vagal tone and suppression during caregiver interactions.

Main Methods:

  • Studied 21 infants aged 3-4 months during a caregiver interaction (Still-Face procedure).
  • Measured respiratory sinus arrhythmia (RSA) as an index of vagal tone, vagal suppression, and heart rate-defined sustained attention.
  • Assessed infant social-communication skills at 9 months via caregiver reports.

Main Results:

  • RSA, RSA suppression, and heart rate-defined sustained attention were significantly associated with 9-month social-communication skills.
  • RSA and heart rate-defined sustained attention during social play were highly correlated.
  • RSA suppression during the Still-Face procedure strongly predicted later social-communication skills, including gaze, facial expression, and gesture use.

Conclusions:

  • Physiological regulation during infancy, particularly vagal activity, is fundamental for social-communication development.
  • RSA suppression during caregiver interactions is a critical early indicator of future communication abilities.
  • These findings highlight the link between infant physiology and socio-communicative competence.

Keywords:
heart rate-defined attentionrespiratory sinus arrhythmiasocial communicationstill face

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