title: Assessment of shock discrimination in rats with signal detection theory.
mesh_terms: D000818:Animals; D004193:Discrimination Learning / Q000187:drug effects; D004597:Electroshock; D008297:Male; D009020:Morphine / Q000494:pharmacology; D010146:Pain / Q000523:psychology*; D051381:Rats
chemical_list: D009020:Morphine