Christine and Donald, thank you both for your suggestions.
From my understanding, it's Donald's suggestion though that is correct.
Donald, just to clarify, I am treating my images before the actual first level analyses (ie 1. prestats step: smoothing, highpass etc, 2. filter step: add confound variables like WM, CSF and global mean and run it on the filtered_func obtained from 1., 3. running 1st level analyses on the res4d obtained from step 2.). So I am almost certain that I would run 3dFWHMx on the res4d that I get from step 3, could you confirm?
Thanks again for all your help!
Torsten
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