Figure 2. Spectral power measured at different time points. (A) Spectrum power (mean ± SD) averaged from all electrodes at baseline, T1, T2 and T3. Topography shows spatial distribution of delta and theta power at the time points. (B) Boxplots of the average power of delta of frontal region at baseline, T1, T2 and T3. # means significance before multiple comparison correction but non-significance after correction.