An overview of the psychopathology of perception: first rank symptoms as a localizing sign in schizophrenia.

Schneider considered that first rank symptoms always signify schizophrenia. They appear to have in common permeability of the barrier between the individual and his environment, or a loss of ego boundaries. They may be a manifestation of a specific disturbance which may be caused pathologically by a limbic lesion in the dominant hemisphere.