Toward an integration of interpersonal and biological processes: evolutionary psychiatry as an empirically testable framework for psychiatric research.

Phenomenological, biological, and interpersonal aspects of psychiatric disorders lack an integrative empirical framework. In this paper evolutionary psychiatry is proposed as a meta-theory to integrate biological and interpersonal aspects of psychopathology. Pathological cognition, emotions, and behaviors may be examined according to specific biosocial goals originally pursued to increase the individual's inclusive fitness, similar to the ways that "normal" processes have been analyzed by evolutionary psychology. Sex-specific differences in prevalence rates and symptomatology of psychiatric disorders may also be better understood if divergent problems of adaptation for men and women in human evolutionary history are taken into account. Instead of mistaking the evolutionary approach for being deterministic and empirically untestable, it may rather be appropriate to provide a functional classification which adds to the contemporary psychiatric nosology through analysis according to specific conflicts of adaptation (at the ultimate level), the pursuit of biosocial goals, and proximate specifiers such as genetic, developmental, and interpersonal causes of disorders.