Hi,
In my study, I want to correct regional BOLD signal change for regional gray matter volume change. I then performed VBM in SPM5 in each subject to extract regional gray matter volume by MarsBar.
In VBM, when performing modulation for gray matter volume ("writing option" in GUI), I wonder if I should choose "non-linear only" or "affine + non-linear" ? (The instruction seems recommand "non-linear only" but the default in SPM is "affine + non-linear")....
Thanks a lot!
Carlos
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