Table 2.
Reaction times and error scores for scanning conditions and the overall Stroop and negative priming effects
| ALS | Controls | Statistic | |
|---|---|---|---|
| Control condition RT (ms) | 802 (190) | 641 (149) | Mann-Whitney U = 18.5, Z = −2.277, p = 0.023 |
| Stroop condition RT(ms) | 932 (207) | 717 (146) | Mann-Whitney U = 13.0, Z = −2.70 p = 0.007 |
| Negative priming condition RT (ms) | 951 (179) | 747 (134) | Mann-Whitney U = 10.0, Z = −2.932, p = 0.003 |
| Stroop effect RT (ms) | 129 (60) | 76 (65) | Mann-Whitney U = 27.0, Z = −1.62 p = 0.105 |
| Negative priming effect RT (ms) | 20 (53) | 29 (53) | Mann-Whitney U = 46.0, Z = −0.154 p = 0.877 |
| Stroop RT expressed as percentage of control RT | 117 (8) | 113 (12) | Mann-Whitney U = 40.0, Z = −0.617, p = 0.537 |
| NP RT expressed as percentage of Stroop RT | 105 (9) | 103 (6) | Mann-Whitney U = 45.0, Z = −0.231, p = 0.817 |
| Errors during control condition | 0.4 (1.3) | 0 (0) | Mann-Whitney U = 44.0, Z = −0.816 p = 0.414 |
| Errors during Stroop condition | 0.3 (0.6) | 0.1 (0.2) | Mann-Whitney U = 41.5, Z = −0.720 p = 0.472 |
| Errors during negative priming condition | 0.6 (1.6) | 0 (0) | Mann-Whitney U = 32.0, Z = −1.767 p = 0.077 |
All values mean (SD)