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Department of Neurology (Dr. Chan), Chang Gung Memorial Hospital, Lin-Kou Medical Center, Tao-Yuan, Taiwan, Republic of China, and the Departments of Neurology and Psychiatry (Dr. Ross), University of Texas Health Science Center at Dallas, Dallas, TX.
A patient with acquired, pathologic left-handed mirror writing and mirror movements during bimanual coordination is reported. CT demonstrated an ischemic infarction involving the right supplementary motor area, medial prefrontal cortex, and anterior cingulate gyms with nearly total sparing of the corpus callosum. This case, together with recent experimental findings in monkeys, supports the hypothesis that the supplementary motor area may be responsible for nonmirror transformation of motor programs originating in the left hemisphere prior to execution by the primary motor area in the right hemisphere.
Address correspondence either to Dr. Chan, Department of Neurology, Chang Gung Memorial Hospital, Lin-Kou Medical Center, Tao-Yuan, Taiwan, Republic of China 333; or to Dr. Ross, Department of Neurology, University of Texas Health Science Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75235. Address reprint requests to Dr. Ross.
Received October 31, 1986. Accepted for publication in final form March 2, 1987.
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