Falk et al. (2013)

Falk, C. F., Heine, S. J., & Takemura, K.(竹村幸祐) (2013).
Cultural variation in the minimal group effect.
Journal of Cross-Cultural Psychology, 45(1), 137-153.
doi: 10.1177/0022022113492892
The minimal group effect (MGE) is one of the most robust psychological findings in studies of  intergroup  conflict,  yet  there  is  little  evidence  comparing  its  magnitude  across  cultures. Recent evidence suggests that the MGE is due in part to a projection of one’s own perceived characteristics  onto  the  novel  in-group.  Because  of  cultural  variability  in  self-enhancement motivations, we thus expected that those from East Asian cultures would exhibit a diminished MGE relative to Westerners. A large and diverse sample of Japanese and American participants completed a traditional minimal group study. American participants were more likely to show an in-group bias in group identification, perceived group intelligence, perceived group personality traits, and resource allocation. Furthermore, these cultural differences were partially mediated by self-esteem. We discuss the implication of these findings for theories of intergroup conflict and suggest multiple directions for future cross-cultural research on the MGE.