The diagnosis and evaluation of the results of slight injury to the brain at birth are made more difficult by the fact that it is impossible to examine the child before the injury or to see what his development would have been without it. The occurrence of a cerebral injury at birth in one of identical twins provides, therefore, an unusual opportunity for the study of the condition, in that it is possible to observe two persons, presumably identical in heredity, growing up in the same family environment and exposed largely to the same physical and psychologic influences, one of whom sustained an injury to the brain at birth. In view of present knowledge of the resemblance in the physique, intellect and personality of identical twins who are brought up together, it would seem a reasonable assumption that any striking differences noted in a comparison of two such twins might
JENKINS RL, GLICKMAN E. CEREBRAL INJURY AT BIRTH TO ONE OF IDENTICAL TWINS. Am J Dis Child. 1934;48(1):130–133. doi:10.1001/archpedi.1934.01960140139014
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