Table 1.
Descriptive statistics of all variables.
| Mean | SD | Reliability | N | |
|---|---|---|---|---|
| ACC | 96 | 2 | --- | 85 |
| RT | 836.69 | 154.06 | .99 | 85 |
| Intelligence | 1498.29 | 80.02 | .79 | 85 |
| IQ | 94.58 | 16.12 | .79 | 85 |
| TUT | 26.07 | 19.24 | .96 | 85 |
| Q-SMW over all | 37.64 | 8.88 | .81 | 85 |
| Q-SMW/item | 5.38 | 1.29 | --- | 85 |
| MRT | 73.49 | 29.45 | .99 | 85 |
| P1 amplitude | 0.94 | 1.34 | .96 | 84 |
| P3 amplitude | 3.91 | 2.97 | .99 | 84 |
| Alpha power | 1.20 | 0.94 | .92 | 84 |
| Theta power | 0.00 | 0.84 | .72 | 84 |
Note: ACC = percent of correct responded trials, RT = reaction time in ms (340 trials of each subject were included), Intelligence = sum score of all scales of the Berliner Intelligence Structure Test, IQ = the intelligence sum score transformed to an IQ score, TUTs = percentage of task-unrelated-thoughts, Q-SMW = mean score in the questionnaire measuring spontaneous mind wandering, MRT = response variability in ms in the metronome response task, P1 = mean amplitude of the occipital P1 in microvolts, P3 = mean amplitude of the centro-parietal P3 in microvolts, Alpha = mean parieto-occipital alpha power in decibel before an imperative stimulus was presented, Theta = mean fronto-central theta power in decibel after an imperative stimulus was presented, reliability: either estimated with the Spearman-Brown corrected correlation coefficients based on an odd-even split (RT, TUTs, MRT, P1 amplitude, P3 amplitude) or with Cronbach’s α (Intelligence test score, Q-SMW, Alpha power). Theta power reliability was estimated by the correlation between the two corresponding electrodes.