"Connections from the periphery to the cortex are not intact before 24 weeks of gestation. Most pain neuroscientists believe that the cortex is necessary for pain perception; cortical activation correlates strongly with pain experience and an absence of cortical activity generally indicates an absence of pain experience. The lack of cortical connections before 24 weeks, therefore, implies that pain is not possible until after 24 weeks. Even after 24 weeks, there is continuing development and elaboration of intracortical networks. Furthermore, there is good evidence that the fetus is sedated by the physical environment of the womb and usually does not awaken before birth."
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https://en.wikiquote.org/wiki/Pain
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