One of the most exciting recent developments in the social sciences has been the rapid formulation and acceptance of evolutionary psychology. Evolutionary psychology (EP) theory informs us that the human mind has certainly evolved and innate mechanisms have been shaped by our ancient social history. Consequently, specifically-evolved mental mechanisms exist that assist the human mind in dealing with complex social phenomena, such as cooperation. Evolutionary psychology theorists posit that for human beings to maximise the benefits of cooperation there need to be efficient ways for individuals to determine whether other members of the social group are operating equitably. Central to successful human cooperation, therefore, we find, amongst o...