1.   A presidential commission Tuesday called for a nationwide review of studies that either provoke psychotic symptoms or withdraw medications from people with mental illness.

2.   After eight weeks of treatment, the Zyprexa group had only half the level of psychotic symptoms as the placebo group, said researcher Scott Woods.

3.   In the most typical cases, the patients have been taken off their medicines while scientists observe their return of psychotic symptoms.

4.   One leading critic of this research said the new rat study raises even more questions about administering ketamine to induce psychotic symptoms in people.

5.   Psychotic symptoms, especially paranoia, are common.

6.   The researchers also say the psychotic symptoms they induce are transient, usually lasting only a few hours, and generally cause patients only modest discomfort.

7.   - Anti-psychotic drugs, while not a cure, can reduce hallucinations and other psychotic symptoms.