We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:
https://discuss.afni.nimh.nih.gov
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The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.
As long as you setup your parameters correctly (in particular, the smoothness of the noise), then AlphaSim should be fine determining the combination of per-voxel and cluster-size thresholds that have a certain 'Alpha' (or 'p') value -- that is, the probability that such cluster could arise from noise only.