 Recent research has shown that 2° of freedom, 2°F, simultaneous, independent and proportional control of hand-risk prostheses can be achieved using surface electromyogram, EMG, signals from remnant muscles as the control input. Two different types of 2°F controllers were tested, one which related the intuitive hand actions of open-close and pronation supination to the corresponding prosthetic hand-risk actions, and another which mapped myoelectrically more distinct, but less intuitive, actions of wrist flexion extension and ulnaradial deviation. Both controllers were calibrated from separate 90-second calibration contractions. The results showed that the sequential two-site control with co-contraction mode switching, C-CON, performed worse than the two 2°F controllers in the predominantly 1°F box block task, suggesting that it may have been difficult for the subject to focus on only 1°F and avoid triggering co-contraction. However, the remaining two tasks required 2°Fs, and both 2°F controllers outperformed C-CON. This article was authored by Ziling Zhu, Zhen Anli, William J. Boyd and others. We are article.tv, links in the description below.