Table 3.
Test-retest reliability for Optokinetic Reflex and Reaction Times (n=40-43). Optokinetic gain is defined as fast phase eye velocity / optokinetic stimulus velocity.
| *Optokinetic Gain | Test 1 Mean ± SD |
Test 2 Mean ± SD |
ICC (95% CI) |
SRD | % Mean |
|---|---|---|---|---|---|
| 20°/s ccw | 0.87 ± 0.15 | 0.80 ± 0.16 | 0.57 (0.36 - 0.76) |
0.28 | 32.1 |
| 60°/s ccw | 0.54 ± 0.21 | 0.50 ± 0.18 | 0.75 (0.59 - 0.86) |
0.29 | 54.4 |
| Reaction Times | |||||
| Auditory (ms) | 256 ± 69 | 247 ± 76 | 0.76 (0.61 - 0.86) |
99 | 38.4 |
| Visual (ms) | 266 ± 46 | 276 ± 56 | 0.33 (0.13 - 0.62) |
121 | 43.5 |
| Dual Task (ms) | 457 ± 107 | 421 ± 118 | 0.78 (0.65 - 0.88) |
158 | 32.6 |
SD = Standard Deviation, ICC = Intraclass Correlation Coefficient, CI = Confidence Interval, SRD = Smallest Real Difference, % Mean = SRD / Average Measure. CCW = Counterclockwise Optokinetic Stimulus, ms = milliseconds.