The Pollyanna myth: how highly agreeable people judge positive and negative relational acts.

Although people high in agreeableness have often been shown to be positively biased toward others, four studies provide evidence that agreeableness is associated with extremity effects, not simple positivity effects, in social judgment. Across studies, agreeable participants judged prosocial behaviors more favorably, but antisocial behaviors more unfavorably, than did disagreeable participants. In support of a goal-congruence mechanism, Study 1 showed that communal goals, rather than perceived similarity, mediated the effects, and Studies 2-4 demonstrated that agreeable perceivers were particularly sensitive to communal (vs. agentic) violations. A longitudinal study of real-life impressions supported the laboratory evidence that agreeable people are highly sensitive to both the prosocial and antisocial behavior of others (Study 4). We discuss how the current account complements and extends existing theories of agreeableness.