(A) The relationship between respiration and rsfMRI signals. (B, C) Voxel-wise correlations between the respiration volume per time (RVT) and rsfMRI signals. (B) Unthresholded correlation map averaged across scans. (C) Thresholded T-value map (one-sample t-test, p < 0.05, false discovery rate [FDR] corrected). Brain regions displaying significant RVT–rsfMRI correlations include the anterior cingulate cortex (ACC), orbital cortex (OC), medial prefrontal cortex (mPFC), piriform cortex (PC), hippocampus (HP), retrosplenial cortex (RSP), and primary somatosensory cortex (S1). (D) Voxel-wise correlations between the RVT and rsfMRI signals after the gamma-band power are regressed out from both signals. (E) Difference of correlation maps before and after gamma power regression (paired t-test, p < 0.05, FDR corrected).