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This article includes Supplementary Video, available online at http://www.interscience.wiley.com/jpages/0885-3185/suppmat .

FilenameFormatSizeDescription
jws-mds.20698.mpg13761K Segment 1. An 85-year-old woman presented involuntary spontaneous, arrhythmic, and bilateral myoclonic contractions of the abdominal and paravertebral muscles. The rate and the amplitude of the involuntary movement were increased by emotional stress and produced gait disturbances. Segment 2. Needle EMG recording from rectus abdominis muscle: arrhythmic brief discharges lasting more than 100 msec. Horizontal calibration, 100 msec; vertical calibration, 200 V. Segment 3. Needle EMG recording from rectus abdominis muscle: high-frequency discharges of the same motor unit following the myoclonic activity. Horizontal calibration, 100 msec; vertical calibration, 50 V. This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

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