Table 2.
The magnitude, direction and asymmetry ratios of force, velocity and displacement responses to GVS. All values represent the average of “On” and “Off” responses. Response magnitudes are group arithmetic mean (standard deviation) and response directions are group angular mean (angular deviation). Directions are in degrees according to sign convention in methods, and r is a measure of concentration of direction within the group. For healthy controls, the upper limit of normal reflex asymmetry is calculated as mean + 2SD. N = 8 for force measurements in schwannoma group.
| Group | Side of stimulus | Measure | Force (N) | Velocity (mm/s) | Displacement (mm) |
|---|---|---|---|---|---|
| Control (n = 22) | Left | Magnitude | 1.45 (0.82) | 20.37 (10.19) | 19.00 (9.19) |
| Direction | 1.03 (7.73) | −0.78 (8.54) | 1.84 (8.83) | ||
| r | 0.991 | 0.989 | 0.988 | ||
| Right | Magnitude | 1.40 (0.77) | 19.71 (9.01) | 19.39 (7.95) | |
| Direction | −6.50 (7.39) | −7.39 (6.76) | −6.11 (7.18) | ||
| r | 0.992 | 0.993 | 0.992 | ||
| % AR | 10.21 (7.43) | 11.89 (8.53) | 10.63 (7.05) | ||
| Range | 0.74–22.97 | 0.04–29.85 | 0.4–27.90 | ||
| Upper limit | 25.08 | 28.95 | 24.73 | ||
| Schwannoma (n = 10) | Affected | Magnitude | 0.38 (0.14) | 6.60 (4.69) | 6.19 (2.18) |
| Direction | −12.79 (16.59) | −5.28 (23.04) | 7.30 (21.72) | ||
| r | 0.916 | 0.838 | 0.856 | ||
| Unaffected | Magnitude | 0.93 (0.41) | 17.73 (14.79) | 10.32 (5.53) | |
| Direction | −10.05 (19.80) | −12.57 (20.38) | −3.04 (16.56) | ||
| r | 0.881 | 0.874 | 0.916 | ||
| % AR | 41.17 (10.30) | 40.33 (15.10) | 21.86 (14.57) | ||
| Range | 30.95–58.62 | 19.44–62.3 | 3.65–40.76 | ||