Complex Demodulation was used to compute the Hilbert transform of the current source density time series from 14 left and 14 right hemisphere Brodmann areas were selected based on the review of the human DMN by Buckner et al. (2008). The mathematical description of the equivalence of complex demodulation and the Hilbert transform is by Bloomfield (2000). Table 1 shows a listing of the nearest Brodmann area fit to the center of the Brodmann areas comprising the DMN to the LORETA Talairach Atlas coordinates (Pascual-Marqui, 1999; Lancaster et al., 2000) and the linkage to the standard anatomical 7 × 7 × 7 mm voxels in the approximate center of each Brodmann areas. All pair wise combinations of the 14 DMN Brodmann areas produced 91 pairs from the left and 91 pairs from the right hemisphere. Only intra-hemisphere analyses of the delta frequency band (1–4 Hz) were included in this study. Different frequencies and cross-hemisphere combinations will be analyzed in a future study. Table 1 shows the Brodmann areas and Talairach Atlas coordinates of the voxels in the present study which
