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. Author manuscript; available in PMC: 2011 Jan 15.
Published in final edited form as: Neuroimage. 2009 Sep 24;49(2):1432–1445. doi: 10.1016/j.neuroimage.2009.09.037

Figure 3. Brain Areas with Higher Amplitude of Low Frequency Fluctuations (ALFF) than Fractional ALFF (fALFF).

Figure 3

(A) Group-level Z-statistic maps showing regions with significantly higher standardized ALFF than fALFF. Using standardized ALFF and fALFF (i.e., Z-scores), a paired two-sample statistical test was carried out (see Methods). Cluster-level multiple comparisons correction was performed using Gaussian random field theory (Z > 2.3; p < 0.05, corrected). (B) The scatter plot shows averaged ALFF and fALFF Z-score for all voxels within a mask selected to comprise the regions exhibiting higher ALFF than fALFF Z-scores in (A). (C) The scatter plot shows the mean ALFF and fALFF Z-score within gray matter (GM), white matter (WM) and other (CSF, vasculature) constrained with the mask depicted in (B). The generation of these three ROIs within the mask depicted in B (GM, WM and other) is detailed in the Methods section. LH = Left Hemisphere; RH = Right Hemisphere.