Movement activated central fast rhythms

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Abstract
Five patients with relatively mild but disabling action myoclonus displayed a subtle and heretofore unemphasized electroencephalographic manifestation of action myoclonus consisting of low-voltage, central fast activity somatotopically related to the extremity being used. The importance of recognizing this rhythm lies in its association with milder forms of action myoclonus which resemble other types of movement disorders, the difficulty in recognizing this rhythm unless special tests are carried out, and the beneficial response of anticonvulsant therapy if the nature of the movement is realized.