Animal Stress pp 113-140 | Cite as

Assessment of Pain in Animals

  • Ralph L. Kitchell
  • Richard D. Johnson

Abstract

Assessment of pain in animals presents problems not readily apparent to the unsophisticated observer. Most people do not realize that pain is a perception, that it has no definitive physical dimensions, and that it is probably the most modified of any sensory system of the body. A stimulus giving rise to the perception of pain in a human in one circumstance may not be painful in another circumstance to the same person or to another person. A strong mechanical stimulus applied to a conscious individual may be very painful; however, if the individual is anesthetized, no pain will be felt. It is therefore incorrect to use “pain” as an adjective in reference to a stimulus, as with a “painful” stimulus, unless the stimulus is actually perceived as being painful. Similarly it is incorrect to refer to “pain” fibers, reflexes, and pathways, because various stimuli may involve these neural mechanisms without the concomitant perception of pain. The conscious state of the individual is of paramount importance. Stimuli strong enough to be perceived as painful in a conscious individual will also produce activity in nerve fibers and pathways and possibly elicit reflexes in unconscious individuals totally unaware of the application of the stimulus.

Keywords

Burning Depression Morphine Neurol Hydrocephalus 

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Copyright information

© American Physiological Society 1985

Authors and Affiliations

  • Ralph L. Kitchell
    • 1
  • Richard D. Johnson
    • 1
  1. 1.Department of Anatomy, School of Veterinary MedicineUniversity of CaliforniaDavisUSA

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