Clip 1: the patient is examined using the essential tremor rating assessment scale (TETRAS). He displays mild postural tremor of his extended hands, delayed appearance of large amplitude tremor of right hand in the "wing-beating" posture, a tremor drawing spirals with his left hand more affected than the right hand, tremor positioning a pen point above a target, and writing tremor. Clip 2: another patient with ET is examined using TETRAS. He exhibits voice tremor, head tremor, and tremor of his hands while extended and in the wing-beating position. Drawing of a spiral, positioning a pen point above a target, and writing are all tremulous.
