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.
Assuming your spatial normalization was no problem, did you apply a mask when running 3dttest? Also did you check the value of each subject at those false positive voxels outside the brain and see why 3dttest rendered such a result?