Because of the fact that the main differences between task conditions were located in delta and theta frequency, all the measures were subdivided into the two frequency bands (delta: 0.5–4 Hz and theta: 4–8 Hz) and averaged for the pre-stimulus (reference, T0) interval between −300 and 0 ms and two consecutive 300-ms post-stimulus time intervals (the first post-stimulus interval, T1: 0–300 ms, and the second post-stimulus interval, T2: 300–600 ms), showing also strongest differences between task conditions. In accordance with this, the average PLI values were statistically analyzed using a four-way repeated measures ANOVA with within-subject factors Condition (Warning, Go, NoGo, and Neutral task conditions), Antero-Posterior (frontal, central and parietal), Laterality (left, medium left, mid-sagittal, medium right, right), and Time Interval (3 time intervals: T0, T1, and T2). Average PC values determined separately for the three midline electrodes under the four task conditions were analyzed statistically using a three-way repeated measures ANOVA Condition×Antero-Posterior×Time Interval (4×3×3). In addition to the average PC, we analyzed also separate electrode pairs not included in the previous networks. Phase coherence for the nine separate electrode
