Fig. 7.

Slips. A: example of a slip during the Circle Tracking Task. The fingertip was following the motion of the circle initially, though somewhat below and to the left of the target, but then suddenly accelerated tangentially (arrow). After this motion was arrested, the fingertip returned to tracking the circle. Inset: scalar jerk magnitude as a function of time for the same data, with a dashed line indicating the value of 0.32 mm/s³ used as the criterion to include such events as slips. B: mean values of magnitude of slip with dominant and nondominant hands for the Circle Tracking Task in right-handed and left-handed subjects. *P < 0.05, ***P < 0.001.