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A: Back-averaging of a focal cortical transient preceding averaged left arm myoclonus electromyographic (EMG) discharges in a patient with cortical myoclonus. B: Enlarged cortical somatosensory-evoked potentials (SEP) from the same patient. Note the similarity of the P25-N33 wave dipole in both A and B. In both A and B, there is a positive wave in the CP4 electrode with a simultaneous FC4 negative wave. Averaged ear reference was used.
