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By using agent-based simulations, Delton and colleagues (1) suggested in PNAS that cooperation by humans in one-shot interactions could have evolved as a byproduct of selection for reciprocity when it is uncertain if interactions will be repeated. We believe their work should be commended both for the novelty of the hypothesis proposed and the explicit cognitive framework in which the model is posed, providing new insight into an important interdisciplinary problem. However, as a result of the authors’ focus on decision-making in the first round of interaction, the possibility of subsequent strategy updating is ignored and, as a result, only a …

Flexible strategies, forgiveness, and the evolution of generosity in one-shot encounters