At least two of the following symptoms must be present for… one month or more. At least one of the qualifying symptoms should be from item a) through d) below:
a) Persistent delusions….
b) Persistent hallucinations….
c) Disorganized thinking….
d) Experiences of influence, passivity, or control i.e., the feeling that a person does not have complete control over their thoughts or actions.
e) Negative symptoms e.g., reduced speech or lack of emotion.
f) Grossly disorganized behavior that impedes goal-directed activity….
g) Psychomotor disturbances e.g.,catatonia or agitation....
The symptoms are not a manifestation of another medical condition (e.g., a brain tumor) and are not due to the effects of a substance or medication (e.g., corticosteroids) on the central nervous system, including withdrawal effects (e.g., from alcohol).[1]