The Iowa Gambling Task (IGT) is a computer-administered cognitive test that measures risk-reward decision-making. Performance is impaired in patients with brain lesions in the ventromedial prefrontal cortex and in people who abuse alcohol, cocaine, marijuana, methamphetamine, opiates, or multiple illegal drugs. Patients with schizophrenia show normal IGT performance in some studies. In particular, adolescent patients and adults with catatonic schizophrenia show impairment. One study found that IGT performance was significantly correlated with negative symptoms. In this study, subjects will take one of two equivalent versions of the IGT at study entry and study completion. Each task session will take up to 30 minutes.