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Negative myoclonus in Lafora disease

EEG and EMG details. Negative myoclonic drops of the fingers and hands are documented with suppression of the EMG activity (arrows). This shows some inconsistent correlation with fast diffuse bursts of polyspikes and polyspike-waves, on a slow, disorganized background. (Courtesy of P Thomas. From: The educational Kit on Epilepsies. Volume 2: Idiopathic generalised epilepsies with myoclonic jerks. Oxford: Medicinae, 2007.)