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. Author manuscript; available in PMC: 2014 Nov 17.
Published in final edited form as: IEEE Trans Biomed Eng. 2011 Nov 29;59(3):645–652. doi: 10.1109/TBME.2011.2177662

Fig. 7.

Fig. 7

Effect of four DOF options on classification error. The 1 DOF option is hand open/close, 2DOFa includes hand open/close and wrist flexion/extension, 2DOFb includes hand open/close and forearm pronation/supination, and 3 DOF includes all DOFs collected. Results are shown for two interelectrode distances (2cm and 4cm) and two configurations: two longitudinal channels (Fig 7a) and four combined channels (Fig 7b) which consisted of two longitudinal and two transverse channels. Results are averaged over seven subjects. TD features were used for this analysis, but the same trends existed across the other feature sets. Error bars show +/− 1 SEM.