title: Amphetamine-barbiturate mixtures: learning and retention in rats.
mesh_terms: D000661:Amphetamine / Q000494:pharmacology*; D000818:Animals; D001463:Barbiturates / Q000494:pharmacology*; D004357:Drug Synergism; D007858:Learning / Q000187:drug effects*; D008568:Memory / Q000187:drug effects*; D051381:Rats; D012054:Reinforcement, Psychology; D012193:Reversal Learning / Q000187:drug effects
chemical_list: D001463:Barbiturates; D000661:Amphetamine