Pain and Its Effects in the Human Neonate and Fetus

THE evaluation of pain in the human fetus and neonate is difficult because pain is generally defined as a subjective phenomenon.1 Early studies of neurologic development concluded that neonatal responses to painful stimuli were decorticate in nature and that perception or localization of pain was not present.2 Furthermore, because neonates may not have memories of painful experiences, they were not thought capable of interpreting pain in a manner similar to that of adults.3 4 5 On a theoretical basis, it was also argued that a high threshold of painful stimuli may be adaptive in protecting infants from pain during birth.6 These traditional . . .