Mean movement parameters extracted from the movement tracker.

Movement onset times (ms) is the time between the go-cue (onset of the first bar) and the actual initiation of movement. Duration of movement (ms) is defined as the time between movement onset and movement offset (when the object on screen is grasped or pointed at). Angle preshaping time (ms) is the time point where a significant difference is observed in thumb-index angle between 45 and −45 degree target bars.