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Ingroup relations reduce core disgust, explaining why groups can act together. This study shows lower disgust when participants identify with the target, promoting cooperation.

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Area of Science:

  • Social Psychology
  • Moral Psychology
  • Evolutionary Psychology

Background:

  • Group cohesion is crucial for cooperation.
  • Disgust responses can inhibit social interaction.
  • The role of ingroup dynamics in modulating disgust is under-explored.

Purpose of the Study:

  • To investigate if ingroup relations attenuate core disgust.
  • To determine if reduced disgust facilitates group coaction.
  • To provide experimental evidence for the link between ingroup identity and disgust.

Main Methods:

  • Study 1: 45 students smelled a t-shirt, with ingroup, outgroup, or interpersonal identity salient. Measured self-reported disgust and willingness to interact.
  • Study 2: 90 students smelled a t-shirt (ingroup, outgroup, or neutral logo) with student or university identity salient. Measured disgust via behavioral proxies (hand washing time, soap use).

Main Results:

  • Self-reported disgust was significantly lower in the ingroup condition (Study 1).
  • Disgust mediated the effect of condition on willingness to interact (Study 1).
  • Behavioral measures confirmed lower disgust for ingroup vs. outgroup or ambivalent targets (Study 2).

Conclusions:

  • Ingroup identification attenuates core disgust responses.
  • Reduced disgust in ingroup contexts promotes willingness to coact and cooperate.
  • Findings elucidate a psychological mechanism underlying group functioning and cohesion.