At the DSM-5, the DSM-IV subtypes of schizophrenia (i.e., paranoid, disorganized, catatonic, undifferentiated, and residual types) are eliminated due to their limited diagnostic stability, low reliability, and poor validity. These subtypes also have not been shown to exhibit distinctive patterns of treatment response or longitudinal course. (Highlights of Changes from DSM-IV-TR to DSM-5, American Psychiatric Publishing) (Formerly called hebephrenic schizophrenia) is characterized by grossly disorganized behaviours manifested in disorganized speech and behaviour and flat or grossly inappropriate affect. People with this disorder act in an absurd, incoherent, or very odd manner that conforms to the stereotype of “crazy” behaviour. Their emotional responses to real-life situations are typically flat, the hallucinations and delusions of patients with this form of schizophrenia tend to shift from theme to theme rather than remain centered on a single idea. People with this disorder usually exhibit extremely bizarre and seemingly childish behaviours, such as masturbating in public or fantasizing aloud. "Understanding abnormal behavior". David Sue, Derald Wing Sue, Stanley Sue.

http://purl.obolibrary.org/obo/MFOMD_0000020

http://purl.obolibrary.org/obo/DOID_5419