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jws-mds.21073.mpg13667K Segment 1. Normal: an untreated marmoset showing normal level of motor activity and alertness. Segment 2. Parkinsonian untreated: following MPTP treatment, this animal demonstrates reduced motor activity, akinesia, hunched posture, and reduced blink rate. The animal is less reactive to stimuli and does not respond to close up filming. Segment 3. MPTP-lesioned marmoset following long-term levodopa therapy with levodopa-induced dyskinesia: involuntary movements of all limbs, mixture of chorea and dystonia. Segment 4. Hyperkinesia: fast ballistic movements. Segment 5. Tracking: following nonapparent stimuli. Segment 6. Staring: this animal was eating and then stopped and was staring at a nonapparent stimulus for several seconds before resuming eating activity. Segment 7. Side-to-side jumping: this animal exhibits repetitive purposeless stereotypies (see Segment 8). Segment 8. Running in circles. Segment 9. Fiddling with bars: this animal repetitively grasps and scrabbles at corner of cage bars. Also exhibits lower limb dyskinesia. This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

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