Tracking errors during training of all subjects, 22 non-disabled children aged 3-9, and one 8-year-old child with a severe motor impairment due to cerebral palsy. Children in the Guidance group and the child with CP did not receive assistance on trials 1, 11 and 12, and received faded guidance during trials 2-10. Children in the No Guidance group did not receive assistance during training. A: Tracking error during each 50 s trial. Note that the tracking error was significantly reduced when guidance was applied at trial 2 in both, non-disable children and child with CP. When guidance was removed during the last 2 trials, children who trained with guidance followed the line better than at the beginning of the training session. B: Percentage of tracking error reduction from trial 1 to last trial. The child with CP significantly reduced more the tracking error than children without a motor impairment who trained without guidance, and showed a tendency of larger reduction than children without a motor impairment trained with guidance (p = 0.104). Error bars in all plots show +/- 1 SD. *p < 0.05.