Figure 8.

Example of Leap Motion^® tracker failures in the pinky tip tracking during a pronation-supination task. The figure shows the three components of the 3D position of the pinky finger during the execution of the movement. After a 20 s period, where the hand pose is correctly estimated, a period of 10 s follows where occasional swapping of the X and Z components occurs. A persistent incorrect estimation of the hand pose occurs in the following 10 s, ending in the final part of the plot with a misinterpretation of the right-hand movements as performed by the left one.