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Dear Amar, > what exactly does the 1st column (set-level) signify? I have done a > number of analyses and received a set-level of 0.998 for all of them. It is the probability (i.e. P value) of obtaining the observed number of clusters, or more, above the specified height and volume thresholds. It is an inference about the SET of clusters that consitute the activation pattern. > In addition, I was wondering whether there is a certain cluster > voxel-size that is used as a cut-off for determining which clusters > show significance. Yes there is and it is predicated on Gaussian field theory. I would read: Friston KJ Holmes A Poline J-B Price CJ Frith CD. Detecting activations in PET and fMRI: levels of inference and power. NeuroImage, 1996;4:223-235. With best wishes - Karl %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%