This article includes Supplementary Video, available online at .

jws-mds.20505.mpg12899K Segment 1. Patient 2, spontaneous speech. Segment 2. Patient 3, spontaneous speech. Segment 3. Patient 3, internal or silent speech. Segment 4. Patient 3, writing. Segment 5. Patient 3, vocalizations and nonvocalizations. Mouth and tongue movements not involved in the action of the vocal cords (e.g., during whistling and blowing) do not produce the myoclonus. Segment 6. Patient 3, swallowing. This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

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