Abstract
As a higher-order cognitive system enabling access to intentional states, and one that few (if any) other species even marginally possess, consciousness or, more appropriately, self-consciousness has likely been both selectively advantageous and the source of adaptive conflict in human evolutionary history. Consciousness was likely advantageous to early human beings because it built on more ancient primate social adaptations. Individuals likely profited by having the capacity to track the intentions of the self and of social others in that consciousness permitted behavioral strategies involving deception and declarative communication. However, consciousness was likely also a source of adaptive conflict in that it interfered with the functioning of more ancient social adaptations, such as infanticide and male sexual coercion of females. Having access to the epistemic states of others meant that knowledge of social transgressions could be rapidly conveyed between parties. For many evolved psychological mechanisms, what was adaptive in human ancestral history suddenly became maladaptive when consciousness appeared.