Catatonic schizophrenia a person is withdrawn, mute, negative and often assumes very unusual postures.
Schizophrenia
SYMPTOMS

Schizophrenia is characterized by at least 2 of the following symptoms, for at least one month:

* Delusions
* Hallucinations
* Disorganized speech (e.g., frequent derailment or incoherence)
* Grossly disorganized or catatonic behavior
* Negative symptoms (e.g., a "flattening" of one's emotions, alogia, avolition; see below)

(Only one symptom is required if delusions are bizarre or hallucinations consist of a voice keeping up a running commentary on the person's behavior or thoughts, or two or more voices conversing with each other.)

For a significant portion of the time since the onset of the disturbance, one or more major areas of functioning such as work, interpersonal relations, or self-care are markedly below the level achieved prior to the onset (or when the onset is in childhood or adolescence, failure to achieve expected level of interpersonal, academic, or occupational achievement).
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