Eligibility CriteriaOnly healthy volunteers, who are age 21 or older.
No history of surgery with metallic implants or known metallic particles in the brain.
Patients cannot be pregnant (as tested with a pregnancy test).
Patients with a psychiatric illness are not eligible.
No history of seizures.
No cardiovascular disease or drug therapy for chronic depression.
No hypersensitivity to benzodiazepines and related drugs.
No history of drug abuse and/or chronic alcoholism.