Partisan extremity was related to lower levels of cognitive flexibility, regardless of political orientation, across 3 independent cognitive assessments of cognitive flexibility

Zmigrod, L., Rentfrow, P. J., & Robbins, T. W. (2019). The partisan mind: Is extreme political partisanship related to cognitive inflexibility? Journal of Experimental Psychology: General, http://dx.doi.org/10.1037/xge0000661

Abstract: The rise of partisan animosity, ideological polarization, and political dogmatism has reignited important questions about the relationship between psychological rigidity and political partisanship. Two competing hypotheses have been proposed: 1 hypothesis argues that mental rigidity is related to a conservative political orientation, and the other suggests that it reflects partisan extremity across the political spectrum. In a sample of over 700 U.S. citizens, partisan extremity was related to lower levels of cognitive flexibility, regardless of political orientation, across 3 independent cognitive assessments of cognitive flexibility. This was evident across multiple statistical analyses, including quadratic regressions, Bayes factor analysis, and interrupted regressions. These findings suggest that the rigidity with which individuals process and respond to nonpolitical information may be related to the extremity of their partisan identities.