MorphineConditioning (Psychology)Conditioning, OperantRewardCocaineMorphine DependenceDopamine Uptake InhibitorsBehavior, AnimalMotor ActivityNucleus AccumbensConditioning, ClassicalNarcoticsAmphetamineExtinction, PsychologicalAnalgesics, OpioidDrug-Seeking BehaviorCentral Nervous System StimulantsSpatial BehaviorReinforcement (Psychology)Narcotic AntagonistsChoice BehaviorBehavior, AddictiveNaloxoneSubstance Withdrawal SyndromeAssociation LearningRats, Sprague-DawleyVentral Tegmental AreaSelf AdministrationDose-Response Relationship, DrugCocaine-Related DisordersReceptors, Opioid, muDrug ToleranceMethamphetamineNicotineAnalysis of VarianceMorphine DerivativesDopamineDopamine AntagonistsReceptors, Opioid, kappaAvoidance LearningFood PreferencesFlupenthixolMicroinjectionsEthanolNaltrexoneN-Methyl-3,4-methylenedioxyamphetamineMice, Inbred C57BLBenzazepinesExploratory BehaviorInjections, IntraperitonealDrug Administration RoutesHeroinMethylphenidateCentral Nervous System DepressantsAmygdalaAdrenergic AntagonistsDrug InteractionsLimbic SystemDopamine AgonistsCuesReceptors, Dopamine D1Tegmentum MesencephaliDynorphinsMotivationDextroamphetamineNicotinic AgonistsReceptors, Dopamine D2Rats, Long-EvansBenzoxazolesReceptors, OpioidMice, KnockoutReceptors, sigmaLocomotionBuprenorphineRats, WistarHypothalamic Area, LateralQuinpiroleProto-Oncogene Proteins c-fosCentral Nervous System SensitizationSexual Behavior, AnimalPatient PreferenceTime FactorsReinforcement SchedulePain MeasurementDopamine Plasma Membrane Transport ProteinsInjections, IntraventricularCopulationEthylenediaminesRacloprideMicrodialysisTobacco Use DisorderReceptors, Dopamine D3Stereotyped BehaviorPain ThresholdBrainMice, Inbred DBAExcitatory Amino Acid AntagonistsReceptor, Cannabinoid, CB1Receptors, GhrelinStereoisomerism