Autoanalgesia: blockade by yohimbine.
D000698:Analgesia; D000818:Animals; D004597:Electroshock; D008297:Male; D009020:Morphine / Q000494:pharmacology; D051381:Rats; D011930:Reaction Time / Q000187:drug effects; D013997:Time Factors; D015016:Yohimbine / Q000494:pharmacology*
D015016:Yohimbine; D009020:Morphine