Evolutionary Psychiatry was first published in 1996, the second edition followed in 2000. This ground breaking book challenged the medical model which supplied few effective answers to long-standing conundrums. A comprehensive introduction to the science of Darwinian Psychiatry, the second edition included important fresh material on a number of disorders, along with a chapter on research. Anthony Stevens and John Price argue that psychiatric symptoms are manifestations of ancient adaptive strategies which are no longer necessarily appropriate but which can best be understood and treated in an evolutionary and developmental context. Particularly important are the theories Stevens and Price propose to account for the worldwide existence of mood disorders and schizophrenia, as well as offering solutions for such puzzles as paedophilia, sado-masochism and the function of dreams. Readily accessible to both the specialist and non-specialist reader, Evolutionary Psychiatry describes in detail the disorders and conditions commonly encountered in psychiatric practice and shows how evolutionary theory can account for their biological origins and functional nature. This Classic Edition of the book includes a new preface by Anthony Stevens and a foreword by Paul Gilbert.