* General symptoms: delusions (such as believing that a newscaster is speaking directly to them through the television); hallucinations (such as hearing voices in one's head of people who are not there); rambling or nonsensical speech; extremely disorganized behavior; inappropriate emotional responses or emotional detachment; minimal speech; and lack of willful movement.

* Catatonic type: minimal or stiff movement or stupor; excessive and erratic movements; negativity (refusal to go places or resistance when being physically moved); muteness; unusual movements, mannerisms, facial expressions, or postures; and senseless and uncontrollable repetition of a person's speech (words or phrases) or movements.

* Disorganized type: nonsensical speech that may be accompanied by silliness and laughter; lack of organization in the performance of basic daily activities such as showering, cooking food, and brushing of the teeth.

* Paranoid type: preoccupation with frequent hallucinations or one or more delusions of persecution.

* Undifferentiated type: general schizophrenia symptoms, but none of the catatonic, disorganized, or paranoid type symptoms.

* Residual type: continued evidence of the disorder, but no prominent or acute symptoms.