I would like to compare fMRI data of two groups (14+14) in a 2nd level analysis in spm. Is it OK to do a cluster-size correction with http://www.sph.umich.edu/~nichols/JG5/CorrClusTh.m by Nichols and Wilke (or other tools compatible with spm) INSTEAD of FWE or FDR? What does the value "Expected voxels per cluster" in the spm results table mean (as this is compleatly different from the value calculated with the tool).
Thanks a lot!
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