5. Current or past DSM-IV or DSM 5 diagnosis of a psychiatric disorder as determined by history and clinical exam including substance use disorder (except for nicotine/caffeine), alcoholism and alcohol dependence. Past history of a mental disorder as defined by DSM IV or DSM 5 will be excluded only if it required hospitalization (any length), or chronic medication management (more than 4 weeks), and that could impact brain function at the time of the study.