voxel-wise functional connectivity in unconscious states. (A) For each seed region, the overlapped regions for all consciousness vs. unconsciousness contrasts (BL > UWS; MCS > UWS, awake > N3-sleep, N1-sleep > N3-sleep, and consciousness > anesthesia) (volume > 20 voxels). (B) In REM-sleep group, the voxel-wise FC contrasts: Awake > N3-sleep (the left panel) and REM-sleep > N3-sleep. The activation clusters are displayed (p < 0.005 uncorrected, volume > 20 voxels).