According to IASP (International Association for the Study of Pain) the definition of pain is: An unpleasant sensory and emotional experience associated with, or resembling that associated with, actual or potential tissue damage. Furthermore, is expanded on: 1) Pain and nociception are different phenomena. Pain cannot be inferred solely from activity in sensory neurons and 2) Verbal description is only one of several behaviors to express pain; inability to communicate does not negate the possibility that a human or a nonhuman animal experiences pain. Continue reading
