Statistical analysis yielded significant main and interaction effects (Table 3). For evoked delta (Table 3, 1st column) and theta (Table 3, 2nd column) power, all main and interaction effects, except the three-way interaction i.e., Group×Condition×Region, were found to be highly significant. For evoked slow alpha power, all main and interaction effects except Group×Region and Group×Condition×Region were found to be highly significant (Table 3, 3rd column). For evoked fast alpha power, all main and interaction effects except Group×Region were found to be highly significant (Table 3, 4th column). In order to illustrate and compare results obtained for different frequency bands in light of the significant three-way interaction effect results for the evoked fast alpha power, post hoc analyses of interaction effects of the pairwise differences for all frequency bands were examined, corrected for multiple comparison using Bonferroni correction, and are plotted and described below (refer to plots in Figs. 3a, 4a, 5a, 6a).
