We argue that anger likely plays a major role in motivating individuals to engage in the biased assimilation of political information—an evaluative bias in favor of information that bolsters one's views and against information that undercuts them

Suhay, E. and Erisen, C. (2018), The Role of Anger in the Biased Assimilation of Political Information. Political Psychology. doi:10.1111/pops.12463

Abstract: Political psychologists have established that politically motivated reasoning is a common phenomenon; however, the field knows comparatively less about the psychological mechanisms that drive it. Drawing on advances in the understanding of the relevance of emotion to political reasoning and behavior, we argue that anger likely plays a major role in motivating individuals to engage in the biased assimilation of political information—an evaluative bias in favor of information that bolsters one's views and against information that undercuts them. We test this proposition with two online studies, the second of which includes a quasi-representative sample of Americans. The studies support our expectations. Individuals felt more negative emotions toward arguments that undermined their attitudes and positive emotions toward arguments that confirmed them; however, anger was nearly alone in fueling biased reactions to issue arguments.