FIG. 8.

Contrast between intrinsic coupling modes showing distinct relationships between amplitude and phase coupling. Left column shows the scatter plots of all 4,351 voxels and the first (red line) and second (blue line) IC. Before ICA decomposition, the envelope correlations were mean centered. PLV values were first log-transformed before mean centering to obtain better convergence of the ICA. FastICA algorithm was used to jointly decompose the amplitude and phase coupling measures into two ICs. The voxels showing the top 2% weighting on the first and second IC are plotted as red and blue dots respectively. The spatial locations of these voxels are shown in the right panels using the same color-coding. The yellow ball shows the seed voxels. The decomposition is performed for all six seed regions: (A) left auditory, (B) right auditory, (C) left visual, (D) right visual, (E) left somatosensory, and (F) right somatosensory cortices. Color images available online at www.liebertpub.com/brain