Overview Impulsivity and Stimulant Administration Status: Completed Trial end date: 2014-05-01 Target enrollment: Participant gender: Summary Examine the interaction between stimulants, such as cocaine and methylphenidate, and impulsivity. Phase: Phase 1 Details Lead Sponsor: Yale UniversityCollaborator: National Institute of Mental Health (NIMH)Treatments: Central Nervous System StimulantsCocaineMethylphenidate