Motivations to reciprocate cooperation and punish defection are calibrated by estimates of how easily others can switch partners

• Sakura Arai ,

  Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

  * E-mail: arai@psych.ucsb.edu

  Affiliations Center for Evolutionary Psychology, University of California, Santa Barbara, California, United States of America, Department of Psychological & Brain Sciences, University of California, Santa Barbara, California, United States of America

  https://orcid.org/0000-0002-0877-6175

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• John Tooby,

  Roles Conceptualization, Methodology, Resources, Supervision

  Affiliations Center for Evolutionary Psychology, University of California, Santa Barbara, California, United States of America, Department of Anthropology, University of California, Santa Barbara, California, United States of America

  ⨯
• Leda Cosmides

  Roles Conceptualization, Funding acquisition, Methodology, Resources, Supervision, Visualization, Writing – review & editing

  Affiliations Center for Evolutionary Psychology, University of California, Santa Barbara, California, United States of America, Department of Psychological & Brain Sciences, University of California, Santa Barbara, California, United States of America

  https://orcid.org/0000-0002-1197-7824

  ⨯