This article includes Supplementary Video, available online at

jws-mds.21320.mpg13845KSegment 1. Patient demonstrating effect of mouth opening and closing on lingual myoclonus, pictures of device as used by our patient.Segment 2. Endoscopic view through the nose which shows rhythmic lingual movements when patient is asked to close the mouth.Segment 3. Endoscopic view through the mouth, which shows that palatal movements occur synchronous with lingual movements.

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