PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Two men arm-wrestling, one with a "myoelectric" prosthetic arm. This artificial arm (at left) actually has no lateral action, but the hand has more gripping force than a normal hand. It is battery powered. Small electrodes placed on the skin at the site of amputation, sense the electrical activity of the remaining arm muscle. These muscle signals are electronically amplified and are used to move the prosthetic arm and hand as required. It gives the user fine limb control, and the ability to use the arm and hand slowly or quickly, with precision and varying strength. The "myoelectric" arm was developed at the University of Utah, USA. Photograph of Bob Goodman.
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