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Reach-to-grasp task. In this task the subject is instructed to reach and grasp a visible object on the table as fast as possible. The vision of the moving hand can be occluded. The depicted chronometers indicate the timing of performance by a healthy subject (violet) and a PD patient (green). The patients generally show bradykinesia of transport, as well as delayed and smaller hand aperture. Refer to text for details.
