"Man, Beast and Zombie" investigates the historical roots, philosophical assumptions and alleged methodological problems of contemporary theories of human nature, in particular evolutionary psychology and cognitive science. He argues that, "The triumph of mechanistic explanations of human nature is as much the consequence of our culture's loss of nerve as it is of scientific advance." (pages 13–14) While rejecting epistemic relativism, with its denial of an objective truth about the world, Malik insists that scientific theories of human nature are, in practice, shaped by cultural influences, as well as being responsive to data. He argues that the scientific study of human nature has been distorted by post-war cultural pessimism. In examining evolutionary psychology and related theories, Malik distinguishes between these theories, which he sees as a form of universal Darwinism (attributing explanatory power to Darwinian theory in a wide range of domains), and the work of "circumspect Darwinists" (who are cautious about its explanatory power) (197).