TABLE IV.
Signal-to-Noise Ratios
| Movement | Thumb Flexion | Small Flexion | Index Flexion | Wrist Flexion | Finger Abduction |
|---|---|---|---|---|---|
|
| |||||
| IM Channel | Median RPNI | Ulnar RPNI | FDPI | FCR | EPL |
|
| |||||
| P1 IM SNR | 251 | 54.1 | 56.4 | 88.5 | 77.2 |
| P2 IM SNR | 23.0 | 79.7 | 66.0 | 350 | 244 |
|
| |||||
| Surface Target | FPL | FDPS | FDPI | FCR | EPL |
|
| |||||
| P2 Surface SNR | 5.33 | 6.65 | 2.26 | 8.82 | 19.6 |
SNRs were calculated for implanted channels by averaging the active and rest RMS voltages across five trials of the individual finger movement most relevant to the targeted muscle. For P2, simultaneous surface recordings were obtained by individually targeting implanted residual muscles. For RPNI comparisons, appropriate residual muscles were selected based on the cued movement.