Out-group competition cues mobilize men’s in-group contributions more than women’s.

Evidence

Van Vugt, De Cremer, and Janssen (2007) demonstrated, across three studies, that in public goods tasks, men contributed more to their in-group when they believed they were competing against an out-group, whereas women tended to contribute equally regardless of whether or not they thought they were competing against an out-group. These results suggest that cues of intergroup competition are particularly salient to men relative to women. — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 1207

Categorization

• XREF: The experimental minimal-group paradigm links directly to the ingroup/outgroup mechanism thread from the Allport-shared-predispositions work this chapter is meant to corroborate — a sex asymmetry in when arbitrary ingroup loyalty activates.
• corroborated: 2 independent passages support this claim — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 1207