highly significantp < 0.001
Source localization analysis revealed that, within the time window from 140 ms to 150 ms, the insula (specifically in the Brodmann area 13 with MNI coordinates x = −40, y = 15, z = 10) exhibited the greatest discrepancy between the two sleep groups, reaching a peak of t = 6.43, indicating a highly significant contrast ( p < 0.001) as illustrated in Figure 6B .