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A model of the human arm, emphasizing the neuromuscular mechanism of feedback and control, has been constructed. Reconstruction efforts focused on two parallel aspects of the model: (1) direct control, (2) sensory feedback. The control scheme included a micro computer aided arm prosthesis using myoelectric pattern recognition as the control concept. The feedback elements centered around generation of two perceptual parameters which communicated to the amputee the state of the arm, thereby decreasing his control decision load. The parameters were electrical pulse frequency and spatial location. The developed technology was integrated into a three degree of freedom, self contained, externally energized arm which included elbow flexion/extension, wrist rotation, and hand grasp. A prototype system has been implemented and tested in the laboratory on a mini computer, and specification for a miniature control package has been established.