For functional connectivity analysis, we used a “whole-brain Brodmann areas (BAs)” approach, selecting all 42 BAs in each hemisphere as regions of interest (ROI). The anatomical definitions of BAs provided by eLORETA software package are based on the Talairach Daemon (http://www.talairach.org/). For the analysis of connectivity between pairs of BAs, a method using a single voxel at the centroid of each BA was chosen. This procedure is justified because eLORETA has a low spatial resolution, which makes it unable to separate two closely spaced sources, and additionally, the single centroid voxel (the closest to the center of the BA mass) is an excellent representative of the corresponding BA.
