<unk>  is a sub-type of schizophrenia included in the International Classification of Diseases (ICD-10), in which it is classified as a mental and behaviour disorder. It is not included in the current Diagnostic and Statistical Manual of Mental Disorders (DSM-5) or the upcoming ICD-11, effective on the 1st of January 2022.<unk>  is characterized by negative ("deficit") symptoms, such as avolition, apathy, anhedonia, reduced affect display, lack of initiative, lack of motivation, low activity; with absence of hallucinations or delusions of any kind.<unk>  schizophrenia was included as a proposed diagnosis for further study in the appendix of the former DSM-IV.
Simple-type schizophrenia
Haltlose personality disorder
Disorganized schizophrenia
Pseudoneurotic schizophrenia
Unitary psychosis
Tardive psychosis
Basic symptoms of schizophrenia
Brief psychotic disorder