Nucleus AccumbensCocaineDopamineCell NucleusDopamine Uptake InhibitorsRewardRats, Sprague-DawleyMicrodialysisSelf AdministrationCulture MediaDopamine AntagonistsConditioning, OperantBehavior, AnimalAmphetamineMicroinjectionsSeptal NucleiLimbic SystemReceptors, Dopamine D2Ventral Tegmental AreaCaudate NucleusCocaine-Related DisordersReceptors, Dopamine D1Motor ActivityRats, Long-EvansCorpus StriatumReceptors, DopamineDopamine Agonists3,4-Dihydroxyphenylacetic AcidBenzazepinesReinforcement (Psychology)Prefrontal CortexNeuronsNeural PathwaysQuinpiroleSubstance Withdrawal SyndromeCentral Nervous System StimulantsNeostriatumFlupenthixolDrug-Seeking BehaviorProto-Oncogene Proteins c-fosHaloperidolAnalysis of VarianceDose-Response Relationship, DrugOncogene Proteins v-fosCuesReceptors, Dopamine D3Appetitive BehaviorExtinction, PsychologicalHeroinConditioning (Psychology)BrainBehavior, AddictiveMuscimolAmygdalaSulpiride2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepinePutamenDopamine Plasma Membrane Transport ProteinsReceptors, Opioid, muRats, WistarNarcoticsHomovanillic AcidRaphe NucleiGlutamic AcidMorphineEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Stereotyped BehaviorReinforcement ScheduleThalamic NucleiHypothalamic Area, LateralEthanolPair BondSucroseSynaptic TransmissionExtracellular SpaceTime FactorsTegmentum MesencephaliSalicylamidesExcitatory Amino Acid AntagonistsGlobus PallidusFood PreferencesReceptors, AMPAGABA AgonistsEnkephalinsMotivationNomifensineCentral Nervous System DepressantsSolitary NucleusFeeding BehaviorMethamphetamineBrain ChemistryDopamine AgentsConditioning, ClassicalNicotineApomorphineElectric StimulationSweetening AgentsRacloprideNarcotic AntagonistsMedial Forebrain Bundle