Medicine refers also to psychogenic pain or psychalgia as a form of chronic pain under the name of " persistent somatoform pain disorder " or " functional pain syndrome ".
2.
Additionally, hypnotic suggestion has been used on specific conversion and psychiatric disorders to limit pain ( e . g . limb paralysis, functional pain, auditory hallucinations and paranoid delusions of control ).
3.
Electroencephalography indicates that the capacity for functional pain perception in premature infants does not exist before 29 or 30 weeks; a 2005 meta-analysis states that withdrawal reflexes and changes in heart rates and hormone levels in response to invasive procedures are reflexes that do not indicate fetal pain.
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