This is a type of sz I only recently heard of that may describe myself and others here if you suffer just from negative symptoms. Here’s some info from a quick google:
Deficit schizophrenia is a syndrome defined by the following criteria: a) presence of at least two out of six negative symptoms: restricted affect (referring to observed behaviours rather than to the patient’s subjective experience); diminished emotional range (i.e., reduced range of the patient’s subjective emotional experience); poverty of speech; curbing of interests; diminished sense of purpose; diminished social drive; b) some combination of two or more of the above symptoms have been present for the preceding 12 months and were always present during periods of clinical stability; c) the above symptoms are primary or idiopathic, i.e., not secondary to factors such as anxiety, drug effect, psychotic symptoms, mental retardation, depression; d) the patient meets DSM criteria for schizophrenia