Cognitive diversity promotes social learning - but only when cognitive differences are obscured
Cognitive diversity is often assumed to catalyze creativity and innovation by promoting social learning. Yet the learning benefits of cognitive diversity often fail to materialize. Why does cognitive diversity promote social learning in some contexts but not in others? We propose that the answer partly lies in the complex interplay between cognitive diversity and cognitive homophily: The likelihood of individuals learning from one another, and thus changing their views about a substantive issue, depends crucially on whether they are aware of the cognitive similarities and differences that exist between them. When social identities and cognitive associations about concepts related to a focal issue are obscured, we theorize that cognitive diversity will promote social learning by exposing people to novel ideas. When cognitive diversity is instead made salient, we anticipate that a cognitive homophily response is activated that extinguishes cognitive diversity’s learning benefits---even when social identity cues and other categorical distinctions are suppressed. To evaluate these ideas, we introduce a novel experimental paradigm and report the results of four pre-registered studies (N=1,325) that lend support to our theory. We discuss implications for research on social influence, collective intelligence, and cognitive diversity in groups.