Key points are not available for this paper at this time.
Naomi Ellemers, Cathy van Dyck, Steve Hinkle, Annelieke Jacobs, Intergroup Differentiation in Social Context: Identity Needs versus Audience Constraints, Social Psychology Quarterly, Vol. 63, No. 1 (Mar., 2000), pp. 60-74
Ellemers et al. (Wed,) studied this question.