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J Exp Psychol Gen. 2017 Aug;146(8):1143-1149. doi: 10.1037/xge0000298. Epub 2017 May 29.

The heart trumps the head: Desirability bias in political belief revision.

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ARC Centre of Excellence in Cognition and Its Disorders, Department of Psychology, Royal Holloway, University of London.
Regent's School of Psychotherapy and Psychology, Regent's University London.


Understanding how individuals revise their political beliefs has important implications for society. In a preregistered study (N = 900), we experimentally separated the predictions of 2 leading theories of human belief revision-desirability bias and confirmation bias-in the context of the 2016 U.S. presidential election. Participants indicated who they desired to win, and who they believed would win, the election. Following confrontation with evidence that was either consistent or inconsistent with their desires or beliefs, they again indicated who they believed would win. We observed a robust desirability bias-individuals updated their beliefs more if the evidence was consistent (vs. inconsistent) with their desired outcome. This bias was independent of whether the evidence was consistent or inconsistent with their prior beliefs. In contrast, we found limited evidence of an independent confirmation bias in belief updating. These results have implications for the relevant psychological theories and for political belief revision in practice. (PsycINFO Database Record.

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