Almost all of the themes contained in E.O.Wilson's sociobiological writing on war and human aggression were prefigured in Anglo-American bio-social discourse, c. 1880–1919. Instinct theory – stemming from animal psychology and the genetics revolution – encouraged the belief that pugnacity had been programmed into the ancient part of the human brain as a result of evolutionary pressures dating from prehistory. War was seen to be instinct-driven, and genocidal fighting postulated as a eugenic force in early human evolution. War was explained (...) in distinctly modern sociobiological terms as adaptive behaviour springing from territorial urges, crowding, competition for resources and reproductive advantage, ethnocentrism and pseudo-speciation. (shrink)

The concept of instinct espoused in psychology in the early 20th century and the contemporary concept of psychological adaptation invite comparison. Definitions of both employ the notions of inheritance, selection, functional specificity, and species typicality. This article examines how psychologists before the rise of behaviourism sought to establish instinct as a psychological phenomenon. One of the consequences of doing so was a decoupling of psychological and physiological forms of instinct. This led to a failure of constraint in the usage of (...) the term instinct and the abandonment of the project to establish it as foundational. I argue that the notion of psychological adaptations at the heart of contemporary evolutionary psychology as espoused by John Tooby and Leda Cosmides invites similar difficulties and may come to share a similar fate. (shrink)