MethylphenidateCentral Nervous System StimulantsAttention Deficit Disorder with HyperactivityPropylaminesDopamine Uptake InhibitorsDopamine Plasma Membrane Transport ProteinsAdrenergic Uptake InhibitorsDextroamphetamineDelayed-Action PreparationsAmphetamineHyperkinesisDose-Response Relationship, DrugDopamineCross-Over StudiesDouble-Blind MethodRacloprideMotor ActivityPemolineBehavior, AnimalApathyPlacebosMethamphetamineCocaineNorepinephrine Plasma Membrane Transport ProteinsAlkalosis, RespiratorySorboseRats, Sprague-DawleyNomifensineSelf AdministrationConditioning, OperantStereotyped BehaviorNeurofeedbackBiogenic MonoaminesExploratory Behavior