[Possibilities and limits of the psychopathological delimitation of psychoses].

On the basis of the analysis of delusional psychoses the author assumes that diagnosis of schizophrenia is justified only if there is a dissociative process which is the most typical for dementia praecox in the Kraepelinian sense and is revealed in delusional or autistic types of existence. Psychoses where a disssociative process is not established (for example, hysterical psychosis) do not belong to schizophrenia. The determination of a dissociative process is important not only for psychopathological research, but biological and psychogenetical one as well.