main effects of all three factors and also significant interactions between these factors for delta frequency, and significant main effects Electrode Pairs and Time Interval, as well as significant Electrode Pairs×Condition, Electrode Pairs×Time Interval, Condition×Time Interval, and Electrode Pairs×Condition×Time Interval interactions for theta frequency (see Table 3 for details). Figure 3 shows average values of PC for each of these 9 connections by time interval, frequency band, and condition. It could be seen that phase synchronization was generally higher in the delta than in the theta frequency band, at least in the networks encompassing central and parietal sites, and was higher in Go and NoGo conditions as compared to the other two conditions (Warning and Neutral). PC values in the Go condition reach the maxima in the first time interval and then remain stable in the second time interval at centro-parietal connections or decrease at frontal-to-central (F3-C3, F4-C4) and frontal-to-frontal (F3-F4) connections. In the NoGo condition, PC values increase continually and reach their maxima in the second time interval, particularly at frontal sites, where the differences between the Go and NoGo conditions are the largest.
