Ability to lie on bed of nails not due to endogenous opioids.
D001346:Autosuggestion; D004723:Endorphins / Q000502:physiology; D005260:Female; D006801:Humans; D006987:Hypesthesia / Q000209:etiology* / Q000523:psychology; D008297:Male; D009619:Nociceptors / Q000502:physiology*; D010146:Pain / Q000517:prevention & control; D012867:Skin / Q000294:innervation*
D004723:Endorphins