Third party aggression: Effects of cooperation and similarity to ingroup member

Tomohiro Kumagai, Ken Ichi Ohbuchi

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    The purpose of the present study was to examine the effect of similarity of group member and cooperative experience on aggression by the third party person who was not personally suffered. 96 participants were assigned into one of four conditions; 2 (high similarity or low similarity) × 2 (cooperative experience or non-cooperative experience). In every condition, the participants observed the victim and then, they were given a chance to retaliate against the harm-doer. The result showed that the cooperative experience increased aggressive behavior. And the perception of threat and aggressive intent mediated between them. Further, the cooperative experience directly increased the aggressive intent and the similarity prompted the aggressive response. We discussed these results from a social identity perspective.

    Original languageEnglish
    Pages (from-to)152-161
    Number of pages10
    Issue number3
    Publication statusPublished - 2006 Sep


    • Cooperative experience
    • Group identification
    • Third party aggression

    ASJC Scopus subject areas

    • Psychology(all)


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