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Paul Emil Flechsig (1847-1929) was an eminent nineteenth-century German neuroanatomist, psychiatrist and neuropathologist. He suggested in 1872 that infants could not feel pain because their nerves are not completely myelinated. <ref name="cope1998">{{REFjournal |last=Cope |first=DK |author-link= |title=Neonatal pain: the evolution of an idea. |journal=The American Association of Anesthesiologists Newsletter |date=1998-09 |volume= |issue= |pages= |url= |accessdate=2020-11-12}}</ref> Incredible as it may seem today, his idea was accepted without question and without being tested.