11. Medications that act on the central nervous system (e.g., Lorazepam, Codeine) and thus may interfere with the interpretation of study results. Specific exclusionary drug classes include but are not limited to: (opioid analgesics, DA receptor agonists, anticholinergics, MAO inhibitors, COMT inhibitors, as well as any illicit substances). In addition, healthy participants may not be on psychotropic medications.