Neurocognitive Assessments: The NIMH MATRICS (Measurement and Treatment Research to Improve Cognition in Schizophrenia Research) Neuropsychological Battery, the Wechsler Test of Adult Reading (WTAR), the N-Back test; and the Continuous Performance Test (CPT-AX) will be used to assess cognitive function. The NIMH MATRICS Neuropsychological Battery is comprised of measures of: a) working memory; b) attention/vigilance; c) verbal memory; d) visual memory; e) processing speed; f) problem solving; and g) social cognition. The N-Back and CPT-AX are both computerized measures of prefrontal cortex dependent cognitive behavior.