The APA defines schizophrenia by the presence of two or more of the following, each present for a significant portion of time during a one-month period: (1)   delusions (2)   hallucinations (3)   disorganized speech (4)   grossly disorganized or catatonic behavior (5)   negative symptoms i.e. affective flattening, alogia or avolition Signs of the disturbance must have been… Continue Reading