This article includes Supplementary Video, available online at

jws-mds.20683.mpg13602K Segment 1. Baseline condition. Neurological examination shows diffuse, irregular, and continuous myoclonic jerks worsened by movement. Repetitive, pseudorhythmic, not voluntary movements of the fingers are also evident. Segment 2. After 1 year of therapy with piracetam, 18 g/day, both rest and action myoclonus are clearly reduced and the patients appears more alert. Dysmetria and dystonic neck and trunk posture are evident. This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.