The basic symptom theory has perhaps, as a result of its empiricalpsychometric developments and other more recent theories, gone beyond its original intentions, and has led to a revival of the studies on the disorders of the Self during the prodromal stages of schizophrenia. Hence, the basic symptom theory has reintroduced the long-established phenomenological and psychopathological studies on schizophrenia (Binswanger, Conrad, Blankenburg), even if these studies are distant from the operational stance of the American DSM. Schizophrenia, virtually by definition, more than a disorder characterized by delusions, hallucinations, disorganized thinking and catatonic behavior (common to many psychotic conditions), is a clinical and existential state that affects in a more or less pervasive way Selfhood (ipseity). The author describes the key ideas of the forerunners of the current views on the disorders of the Self and suggests a formal model of the Self consistent with the clinical features of schizophrenia.
Keywords: Schizophrenia, disorders of the Self, theory of the basic symptoms, Selfhood, ipseity, hyper-reflexivity, depersonalization, Self.