Next, to examine differences between Go and NoGo conditions, we conducted a follow-up ANOVA with two levels of the factor Condition (Go vs. NoGo). A four-way repeated measures ANOVA (Condition×Antero-Posterior×Laterality×Time Interval) revealed significant main effects of all factors (except the factor Condition) and also significant interactions between all these factors for both delta and theta frequency bands (Table 1). The lack of significant main effect of Condition indicates that overall level of inter-trial phase synchrony, without taking into account spatial and temporal relationships, is comparable in Go and NoGo conditions. However, the analysis for both delta and theta frequency bands showed significant interactions of the factor Condition with all other factors, also a significant Condition by Anterior-Posterior by Laterality by Time Interval interaction (s. Table 1), suggesting differences between Go and NoGo conditions with respect to time interval and scalp distribution of inter-trial synchrony. Significant main effect of Time Interval reflected an increase of PLI values in the post-stimulus intervals (T1 and T2) as compared to the reference or pre-stimulus interval (T0), also indicated by post-hoc t-test (p<0.0001). At both
