N-acetylcysteine and NMDA Antagonist Interactions

Inclusion Criteria:

* Ages of 21-45 years from all ethnic backgrounds.
* Male or female.
* Written informed consent.

Exclusion criteria

* DSM-IV diagnosis for a psychotic, depressive or anxiety disorder.
* A history of significant medical/neurological disease such as cardiac, thyroid, renal, hepatic abnormality, seizure disorder. Unstable medical condition based on EKG, vital signs, physical examination and laboratory work-up (CBC with differential, SMA-7, LFTs, TFTs, UA, Utox, Urine pregnancy test) .
* History of severe allergies or multiple adverse drug reactions.
* Any medication that in the opinion of the PI could interfere with either the safety of the study and/or the outcome measures.
* Any other conditions which in the opinion of the investigator would preclude participation in the study.
* History of major psychiatric disorder in first degree relatives.
* Current substance abuse/dependency determined by urine toxicology.
* Current treatment with medications with psychotropic effects.
* Treatment with benzodiazepines within one week prior to testing.
* Current pregnancy, unsatisfactory birth control method report for females.
* Education \< 10th grade.
* IQ \< 70, MR as determined by Wechsler Abbreviated Scale of Intelligence.
* Non-English speaking.