Vanderbilt Clinical Trials

for psychosis subjects: 1. Men and women age 18 - 65. 2. Communicative in English. 3. Provide voluntary, written informed consent. 4. Physically healthy by medical history. 5. BMI > 17.5 and < 45. 6. Diagnosis of a psychotic disorder confirmed by Structured Clinical Interview for DSM-V (SCID) or diagnostic interview with a trained clinician. 7. Stable medication regimen over at least the past two weeks, including the use of either an oral or intramuscular administration of an antipsychotic medication. 8. For females, no longer of child-bearing potential, or agreeing to practice effective contraception during the study; and, 9. For females of child-bearing potential, must have negative urine pregnancy test at time of screening visit and before each testing day. 10. Not breastfeeding/nursing at time of screening or at any time during the study. Inclusion criteria for healthy controls All of the above except for subjects will be psychiatrically healthy and not taking psychotropic or potentially psychoactive prescription medication.

for psychosis subjects 1. Age less than 18 or greater than 65. 2. Not communicative in English. 3. Unable to provide written informed consent. 4. Current medical or neurological illness. 5. History of severe head trauma. 6. BMI < 17.5 or > 45. 7. Meets criteria for diagnosis of substance or alcohol use disorder within the past month. 8. Positive urine pregnancy test at time of screening, before each testing day, or any potential concern for pregnancy at any time during the study. 9. Breastfeeding/nursing at time of screening or at any time during the study. 10. Conditions that preclude MR scanning 11. Conditions that preclude study drug administration Exclusion criteria for healthy controls All of the above and in addition: 1. Current use of psychotropic or potentially psychoactive prescription medication. 2. Major psychiatric disorder as determined by DSM-V (major depression, bipolar disorder, obsessive compulsive disorder, post-traumatic stress disorder, etc)