Fig. 3

Power spectrum analysis results comparing the GAD and healthy control groups. (a) T-statistics of comparing power spectra between the GAD and healthy control groups. The X-axis represents the frequency bins, and the Y-axis represents the channels (for the locations of the channels, please check Fig. 1). The color bar denotes the t value, with red indicating higher power and blue indicating lower power in the GAD group than in the healthy control group. The white lines mark the clusters with significant differences between the groups after cluster-based permutation testing (p < 0.05). (b) Topographic distribution of the t-statistics. The color bar denotes the t value, with yellow indicating higher power and blue indicating lower power in the GAD group than in the healthy control group. The white circles highlight the channels in the cluster with significant differences between the groups (p < 0.05).