Table 2.
Test-retest reliability for horizontal and vertical smooth pursuit (n=40-43). Velocity gain= eye/target velocity. Position gain=eye/target position.
| Smooth Pursuit Parameter | Test 1 Mean ± SD |
Test 2 Mean ± SD |
ICC (95% CI) |
SRD | % Mean |
|---|---|---|---|---|---|
| Horizontal | |||||
| 0.1 Hz Velocity Gain | 0.97 ± 0.07 | 0.94 ± 0.09 | 0.09 (0.00 - 0.78) |
0.19 | 19.9 |
| 0.1 Hz Position Gain | 1.02 ± 0.10 | 1.02 ± 0.04 | 0.12 (0.01 - 0.69) |
0.20 | 19.2 |
| 0.2 Hz Velocity Gain | 1.01 ± 0.07 | 1.00 ± 0.06 | 0.27 (0.08 - 0.61) |
0.15 | 14.8 |
| 0.2 Hz Position Gain | 1.03 ± 0.05 | 1.02 ± 0.04 | 0.08 (0.00 - 0.82) |
0.12 | 12.2 |
| 0.4 Hz Velocity Gain | 1.02 ± 0.05 | 0.99 ± 0.07 | 0.13 (0.01 - 0.67) |
0.17 | 17.1 |
| 0.4 Hz Position Gain | 1.03 ± 0.05 | 1.02 ± 0.04 | 0.01 (0.00 - 1.00) |
0.13 | 12.7 |
| 1.0 Hz Velocity Gain | 0.85 ± 0.14 | 0.87 ± 0.12 | 0.70 (0.51 - 0.83) |
0.19 | 22.8 |
| 1.0 Hz Position Gain | 0.86 ± 0.11 | 0.87 ± 0.12 | 0.71 (0.53 - 0.84) |
0.17 | 19.3 |
| Vertical | |||||
| 0.1 Hz Velocity Gain | 0.93 ± 0.12 | 0.90 ± 0.14 | 0.56 (0.35 - 0.75) |
0.27 | 30.3 |
| 0.1 Hz Position Gain | 1.02 ± 0.11 | 1.00 ± 0.10 | 0.08 (0.00 - 0.85) |
0.32 | 30.6 |
| 0.2 Hz Velocity Gain | 0.93 ± 0.16 | 0.94 ± 0.14 | 0.67 (0.49 - 0.81) |
0.23 | 24.2 |
| 0.2 Hz Position Gain | 1.01 ± 0.11 | 0.99 ± 0.10 | 0.37 (0.16 - 0.64) |
0.24 | 23.7 |
| 0.4 Hz Velocity Gain | 0.90 ± 0.17 | 0.91 ± 0.18 | 0.52 (0.31 - 0.72) |
0.27 | 29.5 |
| 0.4 Hz Position Gain | 0.98 ± 0.11 | 0.97 ± 0.10 | 0.02 (0.00 - 1.00) |
0.36 | 35.5 |
| 0.75 Hz Velocity Gain | 0.77 ± 0.22 | 0.86 ± 0.14 | 0.51 (0.29 - 0.73) |
0.39 | 47.9 |
| 0.75 Hz Position Gain | 0.92 ± 0.15 | 0.91 ± 0.10 | 0.37 (0.17 - 0.64) |
0.29 | 31.4 |
SD = Standard Deviation, ICC = Intraclass Correlation Coefficient, CI = Confidence Interval, SRD = Smallest Real Difference, % Mean = SRD / Average Measure.