Evolutionary Psychology is moving to SAGE. The new address is evp.sagepub.com. Submissions here.

Note from the Editors

After more than a decade of independent operation during which Evolutionary Psychology has grown to become a premier publication outlet for evolutionary psychological research, we are thrilled to have found a permanent home with SAGE. The success of the Journal over the past decade made it impossible for the editors and their current and former graduate students to continue to personally fund and manage the Journal. With the commitment, attention, and resources provided by SAGE, Evolutionary Psychology has a very bright future. A small Author Publication Charge of US$195 (assessed only on submissions accepted for publication following rigorous peer review) ensures that all previous and future articles published in the Journal will remain open access and freely accessible. We are deeply grateful to the Associate Editors, Editorial Board Members, editorial production staff, and the reviewers and readers who have supported the Journal since its inception in 2003, and look forward to working with you and with SAGE to continue to grow Evolutionary Psychology.

Original article:

The effects of temperature priming on cooperation in the iterated prisoner’s dilemma

Evolutionary Psychology 11(1): 52-67 Simon Storey, Psychology, School of Science, Society and Management, Bath Spa University, SIMON.STOREY@bathspa.orgLance Workman, Psychology, School of Science, Society and Management, Bath Spa University


Based on initial research findings by Williams and Bargh (2008) and Kang, Williams, Clark, Gray and Bargh (2011) on the interaction between interpersonal and physical warmth, theoretical models such as cognitive scaffolding and the importance of evaluations of interpersonal warmth in trust-based decisions, this experiment investigated the effect of temperature priming on 30 pairs of British university students with hot and cold objects on frequency of cooperation in a game of iterated Prisoner’s Dilemma. Participants were found to cooperate significantly more frequently when primed with hot objects than with cold objects, supporting the assertion that physical warmth sensation positively affects interpersonal trust evaluation. No support was found for the prediction that male-male pairs would cooperate less than female-female pairs. The implications of these findings to evolutionary and developmental theories of interpersonal warmth are discussed.


Iterated Prisoner’s Dilemma, cooperation, interpersonal warmth.

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Evolutionary Psychology - An open access peer-reviewed journal - ISSN 1474-7049 © Ian Pitchford and Robert M. Young; individual articles © the author(s)

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