In this subtype of schizophrenia the person has diffuse and regressive symptoms; the individual is given to silliness, facial grimaces, and inconsequential rituals and has constantly changeable moods and poor hygiene. There are few significant remissions and eventually considerable deterioration. This form of schizophrenia was formerly called hebephrenia.

a form of schizophrenia characterized by severe disintegration of personality including erratic speech and childish mannerisms and bizarre behavior; usually becomes evident during puberty; the most common diagnostic category in mental institutions

Disorganized schizophrenia is a subtype of schizophrenia as defined in the Diagnostic and Statistical Manual of Mental Disorders. This type is characterized by prominent disorganized behavior and speech (see formal thought disorder), and flat or inappropriate emotion and affect. Furthermore, the criteria for the catatonic subtype of schizophrenia must not have been met.