Analyzing the fMRI data with the classical approach based on a rare/frequent contrast, as well as with the P300-BOLD correlation approach, we obtained spatial maps that seemed to be quite consistent with the ICA results (Supplementary Fig. 7). The rare/frequent contrast map included brain activations in the thalamus, the midbrain, the middle/superior frontal gyrus, the supplementary motor area, the precentral gyrus, the middle temporal gyrus, the inferior and superior parietal lobules, the precuneus and the cuneus (Supplementary Table 3). Conversely, the P300-BOLD correlation map mainly showed the involvement of the insula, the middle frontal gyrus, the anterior cingulate, the supplementary motor area, the precentral gyrus, the middle temporal gyrus, and the inferior parietal lobule, the precuneus and the cuneus (Supplementary Table 4). Comparing the ICA network maps with that of the rare/frequent contrast analysis, we observed a large correspondence areas for activations in the ventral attention network, with a spatial correlation of 0.51 (p<0.001), and a minor overlap for those in the dorsal attention network, with a spatial correlation of 0.10 (p<0.001). By contrast, the P300-fMRI correlation map showed stronger
