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Impression of (A) the optical hand tracking setup and (B–D) the 3 tasks: (B) repetitive finger tapping, an analysis based on the distance between distal joints of the thumb and index finger (in cm); (C) alternating hand movements, an analysis based on the “surface” of the hand (in cm2); and (D) alternating forearm movements, an analysis based on the orientation of the line between the base of the index finger and the base of the pinky in the frontal plane (in degrees).
