This thesis inquires into our ‘human nature’ through an interdisciplinary approach that considers some of the radical changes in intellectual thought at those key points in Western culture in which this concept has been centrally deployed. The broad historical sweep that this study covers finds the preoccupation with defining who we are and what we are capable of inextricably linked with the focus, at most of the pivotal moments examined, on a dominant impulse to conceive human beings as moral creatures.

Hebb's conception of instinctive behavior permits the conclusion that it is just not human nature to be instinctive: while the ant brain is built for instinctive behavior, the human brain is built for intelligent behavior. Since drives cannot be instincts, even when a human driver becomes driven, human motives are not instincts either. This understanding allows us to dismiss the determinism of the old instinctivism found in Freud's bio-psychological unconscious, and of the new instinctivism, exemplified by Wilson's sociobiology. The latter (...) entails an explanatory shift from instincts to genes, in which the deterministic character of instincts is carried over to genes. Since genes are not instincts this is a mistake. (shrink)