Although the subject might not consistently exhibit simultaneous control of the larger number of motors, the ease of physiologically appropriate myoelectric control was likely beneficial in the fluidity of seamless sequential movements that could be observed with use. This work clearly showed that patients are able to control many more than the 3 DOFs that are available on current devices. Although the current system is too complex for broad clinical application, it is clear patients could robustly control a subset of the 6 DOFs such as adding just a wrist flexion/extension component or a powered shoulder flexion/ extension component. This work also motivates the development of more advanced prostheses for commercial use.