Identity fusion is associated with outgroup trust and social exploration: Evidence for the fusion-secure base hypothesis.

Identity fusion - a powerful form of group alignment - is a strong predictor of using violence to defend the ingroup. However, recent theorizing suggests, in the absence of outgroup threat, fusion may instead promote intergroup trust and cooperation. Across five studies we find evidence that fusion to a range of groups (e.g., country, football team) was consistently positively associated with a willingness to trust others generally, trust outgroup members, and social exploration. An internal meta-analysis indicated that fusion was more strongly associated with trust and social exploration, compared to several measures of group identification. These findings provide support for the fusion-secure base hypothesis (Personality and Social Psychology Review. 2023, 27(2), 107-127) and suggest that fusion has the potential to increase a willingness to interact with, and trust, outgroup members.