Motivated Skepticism in the Evaluation of Political Beliefs

Taber, Charles S.; Lodge, Milton
American Journal of Political Science

We propose a model of motivated skepticism that helps explain when and why citizens are biased-information processors. Two experimental studies explore how citizens evaluate arguments about affirmative action and gun control, finding strong evidence of a prior attitude effect such that attitudinally congruent arguments are evaluated as stronger than attitudinally incongruent arguments. When reading pro and con arguments, participants (Ps) counterargue the contrary arguments and uncritically accept supporting arguments, evidence of a disconfirmation bias. We also find a confirmation biasā€”the seeking out of confirmatory evidenceā€”when Ps are free to self-select the source of the arguments they read. Both the confirmation and disconfirmation biases lead to attitude polarizationā€”the strengthening of t2 over t1 attitudesā€”especially among those with the strongest priors and highest levels of political sophistication. We conclude with a discussion of the normative implications of these findings for rational behavior in a democracy.