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Dear Esther, > I posted this before, but I think I wasn't very clear about my > problem. > > I have two models, both cluster-corrected with an z-stat of 2.3, but > model A with a cluster p threshold of 0.05 and model B with a p of > 0.001. > However, both of them look totally alike when I look at the > thresh_zstat nifti files and I can't find the mistake I made. there is nothing strange or surprising here. The cluster forming threshold (z=2.3) determines what the cluster/clusters will look like. In both your cases the clusters that are being tested are identical. Let us then say for each cluster p is either > 0.05 or < 0.001 (i.e., there happens to be no clusters with a p-value in that range). Then your thresholded z-stat images will be identical. Jesper