Table 2.
Variance accounted for (VAF) measures expressed as percentages obtained from comparisons of experimental and model simulated responses to balance perturbations in the 8 test conditions.
| Test condition | VAF PD + torque feedback model | VAF PID model |
|---|---|---|
| 1: Surf Stim 2°, Eyes Closed | 95.1 (2.9) | 94.9 (3.6) |
| 2: Surf Stim 4°, Eyes Closed | 94.7 (3.2) | 95.1 (4.3) |
| 3: Surf Stim 2°, Eyes Open | 94.2 (5.6) | 92.4 (11.0) |
| 4: Surf Stim 4°, Eyes Open | 94.0 (5.8) | 89.2 (14.1) |
| 5: Vis Stim 2°, Eyes Open | 73.2 (22.3) | 74.9 (23.2) |
| 6: Vis Stim 4°, Eyes Open | 75.1 (19.9) | 76.3 (20.9) |
| 7: Surf+Vis Stim 2°, Eyes Open | 97.3 (1.3) | 96.2 (2.6) |
| 8: Surf+Vis Stim 4°, Eyes Open | 96.2 (2.3) | 96.7 (2.2) |
Mean and standard deviation (SD) values are based on 40 subjects except for Condition five where one subject's parameters were not consistent with a stable system and were excluded.