showed a trendp = 0.058
We also performed regression analysis for the DAN and VAN in the alpha band, demonstrating that correlation between the VAN and USN index showed a trend for significance (F(1,11) = 4.403, p = 0.058, r 2 = 0.286), while correlation in the DAN did not reach significant level (F(1,11) = 1.442, p = 0.255, r 2 = 0.116) ( Figure 5 ).