Description: Segment 1 The history of the patient, a 13-year-old girl, is given by intertitles. The patient is shown she has involuntary movements of the arms and head. A knee-jerk reaction test is performed and she has diminished tendon reflexes. Her face and arms are shown in close-up. Her stomach is shown her respiratory movements are irregular. She is shown asleep choreic movements are absent. She is shown six weeks later after bed rest. Her stomach is shown her breathing is regular and calm. She is shown walking and sitting down and has no involuntary movements. The knee reflex test is performed and her reflexes are normal. Time start: 00:00:00:00 Time end: 00:04:57:21 Length: 00:04:57:21