Interaction of stress and morphine in the rat using a classical conditioning design.
D000818:Animals; D002755:Choice Behavior / Q000187:drug effects; D003214:Conditioning, Classical / Q000187:drug effects*; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects; D009622:Noise; D051381:Rats; D013312:Stress, Physiological / Q000523:psychology*
D009020:Morphine