Paths of the tips in the horizontal plane for grasping and pointing.

<p>In both the simulation and the experimental study (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033150#pone-0033150-g002" target="_blank">Fig. 2</a> of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033150#pone.0033150-Smeets5" target="_blank">[76]</a>) the target was a cube (sides of 5 cm) placed at a distance of 30 cm from the digits. To simulate reaching to push on the side of the cube with the index finger, a realistic position was chosen as the goal position of the thumb (1 cm to the side of and 3 cm closer than the goal position of the index finger; indicated with a grey cross).