Dear Volker,
> After computing the t-values, a common (corrected?) threshold
> is applied to all voxels (see spm_getSPM.m). But weren't the p values
> (respectively, t-values) corrected for each voxel separately?
> Does this only happen in spm_list.m?
The corrected p-values for peak height you see in the tabulated list are
only displayed for those voxels which survive your specified t- or
p-threshold. SPM uses the same design matrix at each voxel and estimates
a global spatial smoothness so that the function from t- to corrected
p-values does not change over voxels.
>
> What about the 'sections visualization'? Does this visualization show
> corrected values?
Do you mean when you look at a t-map in the display? The t-maps show the
estimated t-values for each voxel.
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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