Dear Luca,
> As you write, any inference has to be made with corrected p-values.
>
> But also with corrected p-values of different magnitude for different
> regions in a single scan we are not allowed to say that one activation is
> stronger than the other, right?
I wouldn't say that you're not allowed to say that... :-) but the
corrected p-values just give you the 'improbability' that your
observation was acquired under the null-hypothesis (as specified by your
contrast). This means you can only infer from a t-map that there was
some evidence such that you can reject the null-hypothesis for voxel,
clusters or sets. No information about the strength I'm afraid.
> And I think this applies also when comparing two or more SPMs.
> Do you agree?
Yes, I agree.
Stefan
--
Stefan Kiebel
Functional Imaging Laboratory
Wellcome Dept. of Cognitive Neurology
12 Queen Square
WC1N 3BG London, UK
Tel.: +44-(0)20-7833-7478
FAX : -7813-1420
email: [log in to unmask]
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