Under the designation of constitutional psychopathic inferiority is brought together a large group of pathological personalities whose abnormality of make-up is expressed mainly in the character and intensity of their emotional and volitional reactions. Individuals with an intellectual defect (feeblemindedness) are not to be included in this group.

Several of the preceding groups, in fact all of the so-called constitutional psychoses, manic-depressive, dementia precox, paranoia, psychoneuroses, etc., may be considered as arising on a basis of psychopathic inferiority, because the previous mental make-up in these conditions shows more or less clearly abnormalities in the emotional and volitional spheres. These reactions are apparently related to special forms of psychopathic make-up now fairly well differentiated, and the associated psychoses also have their own distinctive features.

There remain, however, various other less well-differentiated types of psychopathic personalities, and in these the psychotic reactions (psychoses) also differ from those already specified in the preceding groups.

It is these less well-differentiated types of emotional and volitional deviation which are to be designated, at least for statistical purposes, as constitutional psychopathic inferiority. The type of behavior disorder, the social reactions, the trends of interests etc., which the psychopathic inferior shows give special features to many cases, e.g., criminal traits, moral deficiency, tramp life, sexual perversions and various temperamental peculiarities.

The pronounced mental disturbances or psychoses which develop in psychopathic inferiors and bring about their commitment are varied in their clinical form and are usually of an episodic character. Most frequent are attacks of irritability, excitement, depression, paranoid episodes, transient confused states, etc. True prison psychoses belong in this group.

In accordance with the standpoint developed above, a psychopathic inferior with a manic-depressive attack should be classed in the manic-depressive group, and likewise a psychopathic inferior with a schizophrenic psychosis would go into the dementia praecox group.

Psychopathic inferiors without an episodic mental attack or any psychotic symptoms should be placed in the "Not Insane" group under the appropriate sub-heading.