Electrodewise comparison of power spectra for EC condition. (A) Shown are Z-values for each electrode and frequency point (Wilcoxon rank sum tests). Non-corrected Z values above 1.96 correspond to p < 0.05. Highly significant electrodes were marked with black circles at different p values. (B) Delta (2-4 Hz) band (corrected, p < 0.004). (C) Theta (4-8 Hz) band (corrected, p < 0.016). (D) Beta (18-25 Hz) band (corrected, p < 0.05).