title: Parameter selection in a rate free test of brain self-stimulation: towards an alternative interpretation of drug effects.
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects; D002707:Chlordiazepoxide / Q000494:pharmacology*; D018492:Dopamine Antagonists; D004924:Escape Reaction / Q000187:drug effects; D005283:Fentanyl / Q000494:pharmacology*; D006220:Haloperidol / Q000494:pharmacology*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D011930:Reaction Time; D012201:Reward; D012653:Self Stimulation / Q000187:drug effects*
chemical_list: D018492:Dopamine Antagonists; D002707:Chlordiazepoxide; D006220:Haloperidol; D005283:Fentanyl