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Following perinatal hemispheric injury, the developing brain reorganizes hand motor control interhemispherically, reallocating some lost functional representation and processing capacity to the intact hemisphere.1,2 A curious self-reported observation of mirror movement augmentation3 by a patient of ours led us to measure this reorganization electrophysiologically, and from this, make simple observations about the way the brain remaps itself following hemispheric stroke.
Case report.
A 19-year-old man with epilepsy was implanted with subdural electrocorticographic (ECoG) electrodes that included left frontoparietal cortex in order to identify the focus of seizure initiation. The right-handed patient had left-sided spastic hemiplegic cerebral palsy, following a perinatal hemispheric stroke. In the course of his hospital stay, he described and then demonstrated the mirror movement effect of his condition. He gripped 2 of the physician's fingers with his left hand, and then reported he was squeezing with full strength. He then raised his right hand, and slowly formed a fist and contracted with his right hand. As he contracted with his right hand, the grip strength with his left hand grew immensely. We measured the electrophysiology underlying …
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