SNR of ROIs. SNR estimate is used to identify dipoles where oscillatory activities are robust. Note that medial ROIs showed considerably lower SNR. The following anatomical labels from FreeSurfer parcellation were used to constrain ROI definition. ACC, anterior and middle-anterior part of the cingulate gyrus and sulci; SEF, paracentral lobule and sulcus; FEF, superior and inferior part of the precentral sulcus; IPS, intraparietal sulcus; DLPFC, middle frontal sulcus; VLPFC, inferior frontal sulcus, opercular, and triangular part of the inferior frontal gyrus.