Table 3.
Summary of decoder accuracy
| Gain |
Rotation |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Decoder | KD (1) | KD (2) | SP (1) | SP (2) | Mean ± SD | KD (1) | KD (2) | SP (1) | SP (2) | Mean ± SD |
| Neuron to force | ||||||||||
| Within | 0.82 | 0.78 | 0.59 | 0.64 | 0.71 ± 0.1 | −0.5 | 0.0 | −1.1 | −4.9 | −1.6 ± 2.2 |
| Across | 0.66 | 0.73 | 0.56 | 0.53 | 0.62 ± 0.09 | 55.4 | 48.5 | 39.3 | 52.5 | 48.9 ± 7.0 |
| EMG to force | ||||||||||
| Within | 0.92 | 0.90 | 0.89 | 0.95 | 0.91 ± 0.03 | −0.9 | −0.6 | −2.4 | 0.6 | −0.8 ± 1.2 |
| Across | 0.87 | 0.98 | 1.12 | 1.12 | 1.0 ± 0.10 | 62.2 | 64.8 | 50.4 | 45.9 | 55.8 ± 9.1 |
| Two stage | ||||||||||
| Within | 0.91 | 0.90 | 0.79 | 0.82 | 0.85 ± 0.06 | −1.1 | 0.2 | −2.3 | −2.8 | −1.5 ± 1.3 |
| Across | 0.83 | 0.80 | 0.71 | 0.70 | 0.76 ± 0.06 | −1.1 | 0.6 | 2.3 | −1.0 | 0.2 ± 1.6 |
Gain and rotation between actual and predicted force signals are shown for both neuron- and EMG-input decoders as well as the two-stage decoder for within- and cross-posture conditions.