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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Neuropsychologia. 2009 Mar 13;47(10):2015–2028. doi: 10.1016/j.neuropsychologia.2009.03.004

Figure 4.

Figure 4

Example of two groups expressing the same pattern of activation across three voxels (or brain areas) but to different degrees. When comparing thresholded maps between groups, as in standard voxel-wise GLM analyses, one would not appreciate the fact that both groups express the same pattern of activation. Further, one might incorrectly conclude activation of voxel 3 is unique to group A. Specific covariance analyses such as MLM and OrT CVA are designed to identify patterns such as these and compare their expression across groups.