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Lateralization and language representation

Observations on aphasia in children, left-handers, and "anomalous" dextrals

From the Unité de Recherches Neuropsychologiques et Neurolinguistiques, U-III de I'I.N.S.E.R.M., Laboratoire de Pathologie du Language de I'E.P.H.E., 2ter, rue d'Alesia, 75014 Paris, France.

The hypothesis is advanced that cerebral dominance includes two elements, interhemispheric specification for language (lateralization) and intrahemispheric language specification (localization). Consequently, each type of aphasia is determined by the degree of dominance establishment (i.e., lateralization and localization) existing at the moment of brain damage. Evidence for this concept is presented through a comparison of aphasia in left-handers and "anomalous" dextrals with aphasia in childhood.

Dr. Brown's address is Department of Neurology, New York University Medical Center, Goldwater Memorial Hospital, Roosevelt Island, New York, NY 10017.

This investigation was supported in part by a fellowship to Dr. Brown from the Foundations' Fund for Research in Psychiatry.

Received for publication June 6, 1975.

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