Source analysis and functional connectivity
An EEG cortical source analysis was performed using exact low-resolution electromagnetic tomography (eLORETA) software (Pascual-Marqui et al., 2011; Vecchio et al., 2021) (publicly available athttp://www.uzh.ch/keyinst/NewLORETA/LORETA01. htm). This is a linear source imaging method used in resting-state EEG studies to estimate the current source densities of EEG rhythms in different frequency bands. Regions of interest (ROIs) were defined according to the Brodmann areas: 41 ROIs (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48), for each hemisphere. A lagged linear coherence between all pairs of the 82 ROIs was extracted by “all nearest voxels” for seven frequency bands: delta (1–4 Hz), theta (4–8 Hz), alpha (8–12 Hz), beta (12–30 Hz), gamma 1 (30–50 Hz), gamma 2 (50–70 Hz), and gamma 3 (70–90 Hz).