The Smoothing Artifact of Spatially Constrained Canonical Correlation Analysis in Functional MRI
Number of voxels affected by the smoothing artifact for two different constrained CCA methods (CCA with the average constraint (cCCA avg) and CCA with the maximum constraint (cCCA max)) as a function of the neighborhood size of the configuration. (a) is for motor data, (b) for memory data (obtained from Figures 6 and 7, resp.). Note that CCA with the max constraint leads to configurations of larger neighborhoods that need to be corrected for the smoothing artifact compared to CCA with the average constraint. The result for CCA with the sum constraint is not shown because the smoothing artifact associated with this constraint is negligible (compare Tables 1 and 2).
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