Table 1.

Comparison of decoding results in nonhuman primates with present human study

			EEG
	Spikes (monkey 1)		Subject 4 (best)		Subject 5 (worst)		Mean (6 subjects)
	r	SNR	r	SNR	r	SNR	r	SNR
Ankle
X	0.79 ± 0.09	4.08 ± 1.8	0.81 ± 0.02	4.71 ± 0.67	0.59 ± 0.12	1.43 ± 1.74	0.58 ± 0.17	1.9 ± 1.74
Y	0.86 ± 0.11	6.25 ± 2.66	0.92 ± 0.009	8.13 ± 0.48	0.71 ± 0.17	2.64 ± 3.34	0.8 ± 0.08	4.84 ± 2.11
Z	0.44 ± 0.15	−0.2 ± 1.48	0.92 ± 0.009	8.03 ± 0.4	0.73 ± 0.11	3.04 ± 2.38	0.76 ± 0.1	4.27 ± 2.19
Joint Angle	N/A	N/A	0.87 ± 0.01	6.1 ± 0.59	0.68 ± 0.11	2.19 ± 2.44	0.68 ± 0.08	2.81 ± 1.16
Ang Vel	N/A	N/A	0.81 ± 0.03	4.54 ± 0.7	0.67 ± 0.08	2.11 ± 2.04	0.71 ± 0.08	3.26 ± 1.63
Knee
X	0.66 ± 0.14	1.96 ± 1.84	0.6 ± 0.06	1.9 ± 0.66	0.4 ± 0.07	0.15 ± 0.87	0.67 ± 0.16	2.22 ± 1.43
Y	0.79 ± 0.13	4.28 ± 2.02	0.9 ± 0.01	7.21 ± 0.6	0.71 ± 0.14	2.64 ± 2.61	0.82 ± 0.07	5.11 ± 1.98
Z	0.39 ± 0.13	−0.52 ± 1.36	0.91 ± 0.005	7.71 ± 0.51	0.74 ± 0.08	3.12 ± 1.92	0.8 ± 0.07	4.73 ± 1.8
Joint Angle	0.84 ± 0.07	5.29 ± 2.06	0.92 ± 0.01	8.41 ± 0.6	0.75 ± 0.1	3.29 ± 2.2	0.85 ± 0.04	5.95 ± 1.35
Ang Vel	N/A	N/A	0.9 ± 0.02	7.16 ± 0.86	0.81 ± 0.08	4.62 ± 2.2	0.84 ± 0.05	5.75 ± 1.66
Hip
X	0.6 ± 0.14	1.15 ± 1.71	0.76 ± 0.04	3.68 ± 0.68	0.57 ± 0.08	1.05 ± 1.5	0.77 ± 0.11	3.54 ± 1.47
Y	0.66 ± 0.14	1.97 ± 1.92	0.82 ± 0.01	4.86 ± 0.31	0.72 ± 0.07	2.84 ± 1.77	0.7 ± 0.1	2.97 ± 1.44
Z	0.56 ± 0.13	0.66 ± 1.75	0.85 ± 0.02	5.8 ± 0.72	0.71 ± 0.1	2.9 ± 1.99	0.81 ± 0.06	5 ± 1.43
Joint Angle	0.73 ± 0.11	2.95 ± 1.95	0.9 ± 0.01	7.29 ± 0.6	0.68 ± 0.16	2.11 ± 3.16	0.81 ± 0.07	5.03 ± 1.79
Ang Vel	N/A	N/A	0.88 ± 0.006	6.56 ± 0.31	0.71 ± 0.13	2.77 ± 2.5	0.8 ± 0.09	4.82 ± 2.3

Values are mean ± SD correlation coefficient (r) and signal-to-noise ratio (SNR, dB) for the prediction of different walking parameters for monkey 1 (Fitzsimmons et al. 2009) and for the best (subject 4)- and worst (subject 5)-decoded subjects and mean across the 6 subjects in the present study. Ang Vel, angular velocity; N/A, not available.