Towards a rationalization of biological psychiatry: a study in psychobiological epistemology.

Contemporary biological psychiatry is in a seemingly inchoate state. I assert that this state of biological psychiatry is due to its violation of an epistemological criterion of rationality, i.e., the relevance criterion; that is, contemporary biological psychiatry is irrational as it adopts a conception irrelevant to the psychobiological domain. This conception is mechanistic. The irrationality of biological psychiatry is manifest as the dominance of neurochemical explanations of psychopharmacological correlations, resulting in predictive sterility and, correspondingly, in the dominance of serendipity. I suggest a rationalization of biological psychiatry through a conception relevant to the psychobiological domain. This conception is hierarchical.