Variance explained (VE) results. Experiments level analysis: Average VE values, by modulatory feature; for the set of voxels comprised in pBOLD (A), and in nBOLD (C). Group level analysis: Average VE and respective standard deviation values, by modulatory feature; for the set of voxels comprised in pBOLD (B), and in nBOLD (D). Undefined values correspond to cases where no voxel had a large enough t-value to survive the threshold used (p < 0.05, uncorrected).