The diagnosis should be restricted to those mental disorders arising as a direct or obvious consequence of brain (or head) injury which produces psychotic symptoms of a fairly characteristic kind. The amount of damage to the brain may vary from an extensive destruction of tissue to simple concussion or physical shock with or without fracture of the skull.

Manic-depressive psychosis, general paralysis, dementia praecox, and other mental disorders in which trauma may act as a contributory or precipitating cause, should not be included in this group.

The following are the most common clinical types of traumatic psychosis and should be specified in the statistical report:

(a) Traumatic delirium: This may take the form of an acute delirium (concussion delirium), or a more protracted delirium resembling the Korsakow mental complex.

(6) Traumatic constitution: Characterized by a gradual posttraumatic change in disposition, with vasomotor instability, headaches, fatigability, irritability or explosive emotional reactions; usually hyper-sensitiveness to alcohol, and in some cases development of paranoid, hysteroid or epileptoid symptoms.

(c) Post-traumatic mental enfeeblement (dementia): Varying degrees of mental reduction with or without aphasic symptoms, epileptiform attacks or development of a cerebral arteriosclerosis.