Table 2.
Saccade mean- and peak-velocity examined separately for each direction.
| Eye-movement parameter | U-test | ||||||
|---|---|---|---|---|---|---|---|
| Young (SD) | Old (SD) | Z-value | p-value | Effect-size (AUC) | |||
| Task I (walking with free gaze) | median saccade amplitude [°] for saccades | Upward | 4.39 (1.46) | 3.50 (1.69) | 1.274 | 0.203 | 0.669 [0.484 0.855] |
| Downward | 5.46 (2.68) | 3.79 (1.65) | 1.963 | 0.050 | 0.699 [0.521 0.877] | ||
| Leftward | 7.26 (2.57) | 4.40 (1.32) | 3.582 | 0.0003 | 0.862 [0.734 0.990] | ||
| Rightward | 6.66 (2.29) | 5.14 (2.21) | 1.688 | 0.092 | 0.671 [0.489 0.854] | ||
| median saccade mean-velocity [°/s] for saccades | Upward | 147.9 (15.4) | 139.8 (14.8) | 0.861 | 0.389 | 0.625 [0.433 0.817] | |
| Downward | 164.9 (32.1) | 138.0 (16.9) | 2.721 | 0.007 | 0.775 [0.616 0.934] | ||
| Leftward | 207.9 (41.9) | 161.5 (27.2) | 3.237 | 0.001 | 0.827 [0.685 0.969] | ||
| Rightward | 197.1 (32.0) | 169.1 (29.3) | 2.342 | 0.019 | 0.737 [0.568 0.906] | ||
| median saccade peak-velocity [°/s] for saccades | Upward | 174.8 (24.5) | 170.3 (25.4) | 0.241 | 0.810 | 0.559 [0.361 0.757] | |
| Downward | 189.1 (45.5) | 166.1 (21.2) | 1.722 | 0.090 | 0.675 [0.493 0.857] | ||
| Leftward | 267.0 (55.4) | 201.2 (38.2) | 3.444 | 0.0006 | 0.848 [0.714 0.982] | ||
| Rightward | 253.4 (47.2) | 199.7 (38.9) | 2.961 | 0.003 | 0.799 [0.648 0.951] | ||
Median saccade amplitude, mean- and peak-velocity of the two groups during the first task and their corresponding statistics. Only saccades with a higher mean-velocity of more than 100° for each direction were analyzed to exclude saccades with an unspecific direction.