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Department of Neurology, McLean Hospital, Belmont, Massachusetts (Dr. Woods), and the Department of Psychology, Massachusetts Institute of Technology (Dr. Teuber), Cambridge, Massachusetts.
Mirror movements are normal in childhood and may persist to a later age following early brain lesions. We studied these movements in patients with childhood hemiparesis at different ages. The earlier the lesions, the more the mirror movements persisted. More mirror movement persisted in the nonparetic hand than in the pareticone. Complete paralysis of either hand tended to abolish all mirror movements in both hands. The task eliciting the most mirror movement was one that may come under ipsilateral control following contralateral damage. The greater persistence of mirror movements after earlier lesions appears to be an indicator of more extensive compensatory motor system reorganization that takes place after damage to a less mature nervous system.
Reprint requests should be addressed to Dr. Woods, Department of Neurology, McLean Hospital, Belmont, MA 02178.
This work was supported in part by a special fellowship to Dr. Woods from the NINCDS (2 F11 NS 02370-NSRB1, and in part by grants to Dr. Teuber from the Alfred P. Sloan Foundation, the Grant Foundation, the Spencer Foundation, and the National Institute of Mental Health (MH-2433).
Presented in part at the twenty-ninth annual meeting of the American Academy of Neurology, Atlanta, April 1977.
Accepted for publication July 12, 1977.
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