'Speaker's cramp', a new type of involuntary mouth-lip-muscle movement
A task-related spasmodic contraction of the muscles of the mouth and jaw, causing involuntary movements of the mouth and lips (oromandibular dystonia), manifesting only during speech as grimacing and sound distortion, has been diagnosed by a research team in Copenhagen, Denmark, and termed "Speaker's Cramp"... click link for more info.
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