title: Conditioned fear-induced opiate analgesia: a competing motivational state theory of stress analgesia.
mesh_terms: D000698:Analgesia; D000818:Animals; D001362:Avoidance Learning; D001522:Behavior, Animal; D003214:Conditioning, Classical; D004723:Endorphins / Q000502:physiology*; D005239:Fear; D005557:Formaldehyde / Q000494:pharmacology; D008954:Models, Biological; D009043:Motor Activity; D009270:Naloxone / Q000494:pharmacology; D009271:Naltrexone / Q000494:pharmacology; D009619:Nociceptors / Q000502:physiology; D012684:Sensory Thresholds; D012769:Shock / Q000503:physiopathology; D013312:Stress, Physiological / Q000503:physiopathology*
chemical_list: D004723:Endorphins; D005557:Formaldehyde; D009270:Naloxone; D009271:Naltrexone