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Evolution, emotions, and emotional disorders.

2009/02/01 by Randolph M. Nesse, Phoebe C. Ellsworth · 376 citations
Psychology · Social Sciences · #Artificial intelligence #Cognitive psychology #Computer science #Cultural Differences and Values #Evolutionary Game Theory and Cooperation #Evolutionary Psychology and Human Behavior #Evolutionary psychology #Natural selection #Psychology #Rendering (computer graphics) #Selection (genetic algorithm) #Social psychology

paper · doi:10.1037/a0013503

published in American Psychologist 64(2), 129-139 (American Psychological Association)

openalex publication_date 2009/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/25

Abstract

Emotions research is now routinely grounded in evolution, but explicit evolutionary analyses of emotions remain rare. This article considers the implications of natural selection for several classic questions about emotions and emotional disorders. Emotions are special modes of operation shaped by natural selection. They adjust multiple response parameters in ways that have increased fitness in adaptively challenging situations that recurred over the course of evolution. They are valenced because selection shapes special processes for situations that have influenced fitness in the past. In situations that decrease fitness, negative emotions are useful and positive emotions are harmful. Selection has partially differentiated subtypes of emotions from generic precursor states to deal with specialized situations. This has resulted in untidy emotions that blur into each other on dozens of dimensions, rendering the quest for simple categorically distinct emotions futile. Selection has shaped flexible mechanisms that control the expression of emotions on the basis of an individual's appraisal of the meaning of events for his or her ability to reach personal goals. The prevalence of emotional disorders can be attributed to several evolutionary factors.

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