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Thousands of patients face upper-limb amputations each year. Such amputations can be classified as transradial, transhumeral, or at the shoulder (i.e., very proximal amputation). Decades of research have resulted in prostheses than can restore some hand function. Past devices, however, were most suited for distal amputations and had limited degrees of freedom. In 2006, the Defense Advanced Research Projects Agency launched the Revolutionizing Prosthetics program to create a next-generation upper-limb prosthesis. This resulted in the DEKA arm, an anthropomorphic, lightweight arm with greatly improved range of motion, dexterity, and control options. Prosthetic control is achieved via a customized combination of electromyogram recordings of pr…