Our primary aim is to determine whether NAC administration will improve NMDA-dependent EEG abnormalities in schizophrenia. We have 3 hypotheses: (1) NAC administration will increase mismatch negativity amplitude as compared to placebo; (2) NAC administration will increase P300 amplitude as compared to placebo; and (3) NAC administration will increase gamma oscillation power and phase synchronization as compared to placebo. We also will examine whether NAC will improve measures of visual neuroplasticity, performance-based measures of neurocognition, and clinical symptoms of schizophrenia.