- Proprioception is the knowledge of the position and orientation of your body and limbs in space, which allows you to touch your nose with your eyes closed, for example. Though commonly called a sixth sense, it is actually an aspect of touch. In prosthetics fields, it is also called the Holy Grail. “If you could give an amputee a sense of where their limb is in space—without having to look at it—that’s huge,” says Paul Marasco
Bionic fingers. Rewired nerves. Science fiction becomes reality as scientists attempt to give prosthetics a sense of touch.