Figure 3. Two clusters of IC EEG source processes with equivalent dipole centroids in or near ACC. A, Larger maps, Mean scalp topographies for the MPFC (top) and MFC (bottom) IC clusters. Smaller maps, Topographies of their individual ICs. Map sign orientation (red vs blue) is arbitrary. B, Equivalent dipole locations of individual ICs in the MPFC (blue spheres, lines) and MFC (red spheres, lines) IC clusters projected on horizontal, sagittal, and coronal views of the standard MNI template brain. Cluster centroids of the equivalent dipole locations (data not shown) are as follows: MPFC, BA32, Talairach coordinates, x = 1, y = 38, z = 11 (blue); MFC, BA32, Talairach coordinates, x = 0, y = 9, z = 39 (red). C, Cluster-mean event-related spectral perturbations time-locked to onset of stimuli mandating spatially congruent and incongruent responses, respectively, for the MPFC (left) and MFC (right) IC clusters. Dark red represents significant (p < 0.01 by two-tailed paired t tests) inincongruent-minus-congruent ERSP differences between the two conditions. Note the absence of an fmθ difference for the MPFC cluster.