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Personality and Social Psychology Review
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The Paranoid Optimist: An Integrative Evolutionary Model of Cognitive Biases

Martie G. Haselton

Communication Studies and Department of Psychology, University of California, Los Angeles

Daniel Nettle

Psychology, Brain and Behaviour, University of Newcastle

Human cognition is often biased, from judgments of the time of impact of approaching objects all the way through to estimations of social outcomes in the future. We propose these effects and a host of others may all be understood from an evolutionary psychological perspective. In this article, we elaborate error management theory (EMT; Haselton & Buss, 2000). EMT predicts that if judgments are made under uncertainty, and the costs of false positive and false negative errors have been asymmetric over evolutionary history, selection should have favored a bias toward making the least costly error. This perspective integrates a diverse array of effects under a single explanatory umbrella, and it yields new content-specific predictions.

Personality and Social Psychology Review, Vol. 10, No. 1, 47-66 (2006)
DOI: 10.1207/s15327957pspr1001_3
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