Norms, Cooperation, and Uncertainty

In the human evolutionary sciences, there is a near-consensus that normative cognition and normative motivation are adaptations, the result of selection for psychological capacities that enable agents to harness cooperation profits more effectively, though specific versions of this idea differ markedly. This article picks up an alternative idea floated in the existing literature but not developed: norms evolved to reduce uncertainty about the social environment. While reducing uncertainty has positive effects on cooperation, by making coordination less problematic, it has positive effects on private, and even antisocial, activities as well. While the evidence is far from decisive, we suggest that it supports the uncertainty-reduction hypothesis more clearly than the normative-guidance-enhances-cooperation hypothesis: it is more consistent with the regulatory breadth of norms, the observed cultural diversity of norms, and the apparent existence of anti-cooperative norms.