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Related Experiment Video

Updated: Jun 6, 2026

Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses
06:42

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Selective self-categorization: meaningful categorization and the in-group persuasion effect.

Natalie A Wyer1

  • 1School of Psychology, University of Plymouth, United Kingdom. natalie.wyer@plymouth.ac.uk

The Journal of Social Psychology
|November 10, 2010
PubMed
Summary

People are more persuaded by in-group messages when the group identity is relevant to the issue. Issue relevance moderates self-categorization effects, influencing persuasion from in-group versus out-group sources.

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Area of Science:

  • Social Psychology
  • Attitude Formation
  • Group Dynamics

Background:

  • Self-categorization theory posits greater persuasion from in-group than out-group sources.
  • Previous research confirms in-group favoritism in message persuasion.

Purpose of the Study:

  • To investigate the moderating role of issue relevance in self-categorization effects.
  • To determine if in-group persuasion is contingent on the relevance of group definition to the attitude issue.

Main Methods:

  • Two studies were conducted involving participants exposed to persuasive arguments.
  • Argument sources were varied as either in-group or out-group.
  • The relevance of the group-defining characteristic to the attitude issue was manipulated.

Main Results:

  • Participants showed greater persuasion by in-group sources when group definition was relevant to the attitude issue.
  • When group definition was irrelevant, persuasion levels were similar for in-group and out-group sources.
  • These findings indicate issue relevance is a key moderator.

Conclusions:

  • The fit between group membership and the attitude domain significantly moderates self-categorization effects.
  • In-group influence is conditional on the perceived relevance of group identity to the issue at hand.
  • Understanding this fit is crucial for explaining persuasion dynamics.