CocaineCocaine-Related DisordersDopamine Uptake InhibitorsCrack CocaineSelf AdministrationDrug UsersConditioning, OperantNucleus AccumbensReinforcement (Psychology)Behavior, AddictiveDrug-Seeking BehaviorReinforcement ScheduleBehavior, AnimalHeroin DependenceSubstance Abuse, IntravenousStreet DrugsDose-Response Relationship, DrugExtinction, PsychologicalNarcoticsMotor ActivityDopamineDopamine Plasma Membrane Transport ProteinsRats, Sprague-DawleySubstance Withdrawal SyndromeHeroinRewardSubstance Abuse DetectionBenztropineButyrylcholinesteraseDopamine AntagonistsSubstance-Related DisordersInternetDopamine AgonistsReceptors, Dopamine D2MethamphetamineMethadoneMarijuana AbuseSoftwareOpioid-Related DisordersVentral Tegmental AreaCuesRats, Long-EvansTime FactorsCorpus StriatumAnalysis of VarianceConditioning (Psychology)SaimiriAmphetamine-Related DisordersMicrodialysisDrug InteractionsReceptors, Dopamine D3Prenatal Exposure Delayed EffectsMotivationAmphetamineDextroamphetamineMacaca mulattaNeedle SharingDrug OverdoseInjections, IntravenousBrainGas Chromatography-Mass SpectrometryBenzazepinesChoice BehaviorQuinpiroleTropanesMarijuana SmokingDiscrimination LearningEuphoriaFlupenthixolComputer GraphicsCarboxylic Ester HydrolasesCannabisLocomotionStereotyped BehaviorPutamen