*3.2. Results of the EEG Data Analysis on the Sensor Level*

Comparing the prestimulus ERSP on four intervals, we found one cluster with *p* = 0.0015 (corrected using the permutation statistics) in the 9–11 Hz frequency band, including parietal and temporal sensors (P8, TP8, T8, FC4, FT8) in the right hemisphere (Figure 3A). The ERSP averaged over the EEG sensors in this cluster grew with the interval number from 0.18 ± 0.11 SE at interval 1 to 0.49 ± 0.15 SE at interval 4 (Figure 3B). We also compared the ERSP between males and females and between two age groups ("<26 y.o." vs. ">26 y.o.", where 26 was the median age) via the independent-samples *t*-test with cluster-based correction for multiple comparisons. In both cases, the difference was insignificant.

**Figure 3.** Results of the EEG data analysis on the sensor level: A scalp topogram illustrates *F*-value and EEG channels cluster, demonstrating the significant change of ERSP between four intervals ( ∗ *p* = 0.0015 via *F*-test and cluster-based correction for multiple comparisons) (**A**). Changing ERSP in this cluster (group mean ± 95% CI) with the time with the interval number (**B**).
