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Fig. 3 | Cerebellum & Ataxias

Fig. 3

From: Oculopalatal tremor following sequential medullary infarcts that did not cause hypertrophic olivary degeneration

Fig. 3

Right upper extremity tremor was recorded with a triaxial gyroscopic motion transducer mounted on the dorsal surface of the hand, between the second and third metacarpal bones, just proximal to the metacarpophalangeal joints. The X, Y, and Z-axes of the transducer were oriented laterally, axially and perpendicular to hand, measuring pitch, roll and yaw angular velocity (deg/s) of the hand. The recording began with the right upper limb extended horizontally in front of the patient. At two seconds, the patient flexed the elbow about 100 deg, bringing her upper limb into the so-called wing-beating posture, with her hand positioned about 10 cm anterior to her chin. Tremor increased greatly when the wing beating posture was assumed (upper graph). The amplitude spectra shown in the lower three graphs are the distributions of X, Y and X root mean square angular velocity distributed over frequency (Hz). The spectra demonstrate a finely tuned oscillation at 2.4 Hz

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