Table 2.
Reaction time and accuracy rate of ANT task during EEG.
| HC (n = 19) Mean (S.E.) |
AD (n = 15) Mean (S.E.) |
LBD a (n = 33) Mean (S.E.) |
Between-Group ANOVA Comparison (df = 2, 64) |
Between-Group Tamhane’s T2 Post-Hoc Comparison |
|
|---|---|---|---|---|---|
| RT for correct trials (ms) | |||||
| No cue | 1064.23 (37.63) | 1486.06 (112.17) | 1751.87 (75.02) | F = 20.12 *** | HC < AD = LBD |
| Neutral cue | 1011.30 (33.78) | 1444.94 (109.30) | 1734.66 (79.36) | F = 21.16 *** | HC < AD = LBD |
| Spatial cue | 919.62 (30.70) | 1379.95 (132.64) | 1662.94 (83.29) | F = 18.79 *** | HC < AD = LBD |
| Congruent | 766.13 (23.60) | 1051.28 (90.12) | 1325.69 (61.49) | F = 20.82 *** | HC < AD = LBD |
| Incongruent-easy | 1066.23 (39.62) | 1454.80 (117.00) | 1787.02 (96.18) | F = 15.34 *** | HC < AD = LBD |
| Incongruent-hard | 1162.79 (46.14) | 1804.88 (155.17) | 2036.75 (89.23) | F = 20.96 *** | HC < AD = LBD |
| Accuracy rate (%) | |||||
| No cue | 97.72 (0.68) | 85.72 (3.95) | 79.96 (2.85) | F = 10.11 *** | HC > AD = LBD |
| Neutral cue | 97.80 (0.44) | 87.01 (4.37) | 80.86 (3.16) | F = 7.54 *** | HC = AD; HC > LBD; AD = LBD |
| Spatial cue | 98.61 (0.36) | 85.39 (4.62) | 80.38 (3.17) | F = 8.48 *** | HC > AD = LBD |
| Congruent | 99.22 (0.34) | 91.81 (4.40) | 88.23 (2.61) | F = 4.10 * | HC = AD; HD > LBD; AD = LBD |
| Incongruent-easy | 96.84 (0.66) | 86.55 (4.10) | 78.84 (3.25) | F = 8.41 *** | HC = AD; HD > LBD; AD = LBD |
| Incongruent-hard | 98.07 (0.67) | 79.76 (5.03) | 74.13 (3.87) | F = 10.51 *** | HC > AD = LBD |
| RT differences for correct trials (ms) | |||||
| Alert | −52.92 (9.82) *** | −41.11 (13.71) ** | −17.20 (16.68) | F = 1.46 | HC = AD = LBD b |
| Orient | −91.68 (9.29) *** | −64.99 (32.90) | −71.72 (18.06) *** | F = 0.37 | HC = AD = LBD |
| Conflict | 96.56 (24.87) *** | 350.08 (68.47) *** | 249.73 (51.10) *** | F = 4.59 * | HC < AD = LBD |
| Executive | 348.38 (28.66) *** | 578.55 (55.91) *** | 586.19 (41.26) *** | F = 8.83 *** | HC < AD = LBD |
| Accuracy rate difference (%) | |||||
| Alert | 0.05 (0.61) | 1.33 (1.19) | 0.88 (1.01) | F = 0.31 | HC = AD = LBD b |
| Orient | 0.79 (0.36) * | −1.53 (1.27) | −0.48 (0.65) | F = 1.74 | HC = AD = LBD |
| Conflict | 1.23 (0.78) | −6.79 (2.57) * | −4.71 (1.73) * | F = 4.25 * | HC > AD = LBD |
| Executive | −1.77 (0.48) ** | −8.66 (2.39) ** | −11.75 (2.27) *** | F = 5.69 ** | HC > AD = LBD |
‘a’ indicates that LBD consists of 15 PDD and 18 DLB patients; b indicates the post-hoc test is Tukey method. The symbols ‘*’,‘**’ and ‘***’ indicates p ≤ 0.05, p ≤ 0.01 and p ≤ 0.001, respectively. As for post-hoc analyses, the symbols ‘<’ and ‘>’ indicates p ≤ 0.05 while ‘=’ indicates p > 0.05. S.E. means standard errors. The units for RT and accuracy are millisecond (ms) and percentage (%).