What is the term for the tendency to perceive outgroup members as less diverse than ingroup members?

The term that refers to the tendency to perceive outgroup members as less diverse than ingroup members is correctly identified as out-group homogeneity bias. This concept highlights how individuals often see their own group (ingroup) as being made up of more varied and nuanced individuals, while viewing those in groups they do not belong to (outgroups) as more similar or uniform.

This perception can lead to stereotyping and generalizations about the characteristics of outgroup members, as people might assume that all members of an outgroup share the same traits or behaviors, thus ignoring individual differences. This bias can contribute to misunderstandings and conflicts between groups, as it simplifies the complexities of human behavior into broad categories, undermining the recognition of individual identities and experiences within outgroups.

The other concepts listed relate to social behavior but do not specifically capture this particular perception. Out-group bias refers more generally to negative attitudes or behaviors directed towards outgroup members, in-group favoritism describes the preference for members of one's own group, and social categorization pertains to the classification of individuals into groups, without explicitly addressing the issue of perceived diversity.