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Development of above normal language and intelligence 21 years after left hemispherectomy

Neuropsychological Laboratory, Section of Speech and Hearing Sciences, Department of Physical Medicine and Rehabilitation, University of Michigan Medical School, Ann Arbor, Michigan (Dr. Smith), and Department of Neurosurgery, University of Illinois School of Medicine, 912 S. Wood Street, Chicago, Illinois (Dr. Sugar).

Neuropsychologic follow-up studies of a 5-year-old boy who had left hemispherectomy for seizures showed that he had developed superior language and intellectual abilities. These findings contrast with recent reports indicating that the plasticity of the nervous system may have been overrated and contradict reports of restricted development of language functions after left and of nonlanguage functions after right hemispherectomy for perinatal lateralized brain lesions. Following removal of the left hemisphere, including "the classical language zones," the right hemisphere and other intact residual structures may provide the necessary substrata for the development of above normal adult language and intellectual capacities.

This study was partially supported by NINDS grant No. 5 RO1 NS 10089–02. Received for publication December 19, 1974.

Requests for reprints should be directed to Dr. Smith at Neuropsychological Laboratory, Section of Speech and Hearing Sciences, University of Michigan, 1111 E. Catherine St., Ann Arbor, MI 48104.

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