Selective exposure bias predicts views on diversity over time

Despite growing diversity, many individuals do not support it, posing a challenge to the successful functioning of societies, institutions, and organizations. We investigated the role of the selective exposure bias on diversity beliefs. In a large-scale nationally representative Spanish sample (N = 2,297), we conducted a time-lagged experiment with two time points 5 months apart in which we offered participants a monetary incentive to (allegedly) read attitude contradictory versus conforming information about societal support for refugees. The selective exposure bias asymmetrically predicted future diversity beliefs. Among individuals with a positive intergroup orientation, the selective exposure bias did not predict future diversity beliefs. However, among individuals with a negative intergroup orientation, the selective exposure bias predicted lower pro-diversity beliefs over time, over and above initial pro-diversity beliefs and ideological dispositions. These findings suggest that the absence of pro-diversity beliefs partly originates from a cognitive bias, holding critical implications for policymakers seeking to improve intergroup relations.