Okay, now I understand.
About the "neuropsychological test battery", this should have served as an example for running an F-test first and post-hoc tests afterwards... So I would use post-hoc tests only in case the F-test showed a significant group effect, but not for all the individual neuropsychological tests.
Dunno, but as far as I understood you meant that this would not be the case with fMRI data? That is running an F-Test, getting some significant clusters, and running post-hoc tests inside these clusters (and not across the whole brain) would be invalid? But that's what post-hoc tests do, focusing on effects found in previous analyses?
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