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Facial expressivity, how much people move their faces during social interactions, is a stable individual trait. Greater facial expressivity leads to positive social outcomes like being well-liked and agreeable.

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Area of Science:

  • Social Psychology
  • Nonverbal Communication
  • Behavioral Science

Background:

  • Individual differences in dynamic facial behavior during social interaction are significant.
  • Previous research has not extensively studied facial expressivity variation in large-scale social interactions.

Purpose of the Study:

  • To measure variation in dynamic facial behavior during social interaction.
  • To examine the relationship between facial expressivity and dyadic outcomes, including impression formation.
  • To investigate the stability and social advantages of facial expressivity.

Main Methods:

  • Two studies were conducted using video call interactions.
  • Study 1 involved 52 participants and confederates, with clips rated by 176 independent observers.
  • Study 2 analyzed video calls of 1315 participants using automated Facial Action Coding Scheme (FACS) analysis and self-report measures.

Main Results:

  • Facial expressivity varied significantly across individuals but was stable across contexts, partners, and time.
  • Higher facial expressivity correlated with being well-liked, agreeable, and successful in negotiations (Study 1).
  • Facial expressivity was linked to agreeableness, liking, extraversion, and neuroticism (Study 2).

Conclusions:

  • Dynamic facial behavior is a stable individual difference with significant social implications.
  • Facial expressivity appears to confer social advantages, suggesting an adaptive, affiliative function.
  • Understanding facial expressivity is crucial for comprehending social interaction dynamics and impression formation.