Entitativity research has measured cognition but not behavior.

Evidence

The research we have reviewed has addressed an impressive array of questions. Yet it is safe to say that nearly all of these studies have focused on the “mental experience” of entitativity in the perceiver. As such, the dependent variables in these studies have been judgments of groups, recall of information, response times to group-relevant stimuli, and other measures familiar to social cognition researchers. All this effort has been very informative. However, we have had very little to say about the effects of perceived entitativity on behavior. — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 284