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Departments of Pediatrics and Neuriilom-, New York Hospital-Cornell Medical Center. New York, NY.
Mirror movements are seen in normal children in the first decade. The movements persist after age 10 in patients with congenital hemiparesis. At first, mirror movements are more prominent in the good hand (when the impaired hand attempts a unimanual task), but after age 10, mirroring diminishes in the good hand, and these movements are equally prominent in good and impaired hands. Maturational changes in callosally mediated inhibition of uncrossed motor pathways and reorganizational changes of the pyramidal motor system after early unilateral brain injury explain these age-dependent changes in asymmetries of mirror movements.
Address correspondence and reprint requests to Dr. Nass. New York Hospital. Department of Pediatrics. 1900 York Avenue, New York. NY 10021.
Supported in part by an NIH National Research Service Award #5 F32 HI) O6151-0:1, a Rockefeller Brothers Clinical Scholarship, and a grant from the March of Dimes.
Presented in part at the thirty-sixth annual meeting (if the American Academy o f Neurology., Boston. M. A. April 1984.
Accepted for publication November 1, 1984
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