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Movement arrest analysis showing a representative trial (with clockwise and counterclockwise rotation angle traces) in an individual with Parkinson disease (PD) (panel A) and a healthy older adult (panel B) during the power grasp task. Panels C and D show total number of submovements (arrests in movement) in PD and control groups during single-task (panel C) and dual-task (panel D) conditions for both grasps.
