title: Cortical evoked potential changes during self-administration of morphine by rats.
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects / Q000503:physiopathology; D003213:Conditioning, Psychological / Q000187:drug effects; D005071:Evoked Potentials / Q000187:drug effects*; D005260:Female; D006801:Humans; D009020:Morphine / Q000494:pharmacology; D009021:Morphine Dependence / Q000503:physiopathology*; D051381:Rats; D012646:Self Administration; D013375:Substance Withdrawal Syndrome / Q000188:drug therapy
chemical_list: D009020:Morphine