Table 3.
Performance measured outside of the scanner (proportion correct among executed saccades, proportion of omissions, reaction times in ms) of young persons, healthy elderly and aMCI patients in pro-saccade and anti-saccade task.
| Parameters | Young persons vs. healthy elderly | Healthy elderly vs. aMCI | |||||
|---|---|---|---|---|---|---|---|
| Young persons | Healthy elderly | t(df) | p | aMCI | t(df) | p | |
| HIT RATESa | |||||||
| Pro-saccades | 0.99 (0.01) | 0.99 (0.01) | 0.462 (30) | 0.648 | 0.98 (0.03) | 1.100 (40) | 0.278 |
| Omissions | 0.001 (0.0001) | 0.043 (0.208) | −0.956 | 0.339 | 0.071 (0.262) | −0.416 | 0.676 |
| Anti-saccades | 0.96 (0.04) | 0.74 (0.16) | −4.865 (30) | 0.000* | 0.57 (0.18) | 3.063 (40) | 0.04* |
| Omissions | 0.0045 (0.0006) | 0.023 (0.104) | −0.1.078 | 0.281 | 0.036 (0.089) | −1.496 | 0.135 |
| REACTION TIMES (ms) | |||||||
| Pro-saccades | 249.2 (28.3) | 285.6 (53.7) | 2.227 (30) | 0.034* | 306.3 (241.4) | −0.908 (40) | 0.370 |
| Antisaccades | 338.5 (21.8) | 478.3 (119.6) | 4.146 (30) | 0.000** | 509.0 (118.6) | −0.804 (40) | 0.427 |
aMCI, amnestic mild cognitive impairment; n.s., not significant; denoted are mean values, standard deviations (in brackets), Z- and p-values. Levels of significance indicated by askerisks:
*
p < 0.05;
**
p < 0.01.
a
Note that there were 4 possible target positions. Thus, performance by chance would correspond to a hit rate of 25%.
Significant values (p < 0.05) are marked in bold font.