Figure 5: During motor training, those participants trained with the wrench turned each of three screws on the above object for 20 trials each from easiest (square yellow screw, far left) to hardest (octagonal green screw, center front).

Participants trained with the chopsticks practiced moving each of the rubber objects depicted above to a different location for 20 trials each from easiest (peanut, middle) to hardest (pineapple, right).