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The Effect of Intergroup Conflict on Ingroup Cooperation and Conformity: An Experimental Vignette Study†

In this study, we aimed to test the hypothesis that intergroup conflict would enhance not only ingroup cooperation, but also conformity (frequency-dependent tendency). One hundred and eighty undergraduate students participated in a vignette experiment. They read four scenarios describing daily intergroup conflict situations, and rated behavioral intention for ingroup cooperation and frequency-dependent tendency of ingroup members. In each vignette, level of intergroup conflict (weak/moderate) was manipulated by costs of defeat. The results supported the hypothesis in part that intergroup conflict enhanced both ingroup cooperation and conformity.