TABLE 3.
Flanker task performance
| Verum | Sham | Verum versus sham | ||||||
|---|---|---|---|---|---|---|---|---|
| Measure, mean ± SD | High‐impulsive (n = 24) | Low‐impulsive (n = 21) | Test statistic with effect size (group comparison) | High‐impulsive (n = 24) | Low‐impulsive (n = 21) | Test statistic with effect size (group comparison) | Test statistic with effect size | |
| Overall RT (ms) | 459.88 ± 97.96 | 463.74 ± 79.51 | Z = −0.41; p = .682; r = −.061 | 449.28 ± 96.19 | 435.92 ± 118.52 | Z = −0.50; p = .617; r = −.075 | Z = −1.25; p = .212; r = −.186 | |
| Correct‐trial RT (ms) | 345.67 ± 53.26 | 356.72 ± 48.95 | t 43 = −0.72; p = .475; d = 0.215 | 343.20 ± 57.55 | 342.48 ± 90.42 | Z = −0.98; p = .328; r = .146 | Z = −0.51; p = .608; r = −.076 | |
| Error‐trial RT (ms) | 473.17 ± 117.87 | 470.51 ± 111.96 | t 43 = −0.08; p = .939; d = −0.023 | 450.03 ± 106.65 | 434.23 ± 123.13 | t 43 = 0.46; p = .647; d = 0.137 | t 44 = 1.66; p = .104; d = 0.257 | |
| Overall SD (ms) | 112.30 ± 25.07 | 114.39 ± 27.98 | t 43 = −0.27; p = .793; d = −0.081 | 115.05 ± 33.60 | 107.33 ± 36.05 | t 43 = 0.74; p = .461; d = 0.221 | t 44 = 0.36; p = .724; d = 0.060 | |
| Overall errors (no.) | 38.96 ± 19.01 | 28.38 ± 13.99 | Z = −2.13; p = .033; r = −0.318 | 41.75 ± 24.23 | 28.86 ± 20.45 | Z = −1.99; p = .046; r = −0.297 | Z = −0.06; p = .955; r = −0.009 | |
Abbreviations: d, effect size Cohen's d; r, effect size Mann–Whitney‐U‐test, Wilcoxon test; RT, reaction time; SD, standard deviation; Z, Mann–Whitney‐U‐test (group comparison), Wilcoxon test (stimulation comparison).