Thanks Helmut.
Yann
> On 1 Oct 2015, at 1:45 am, H. Nebl <[log in to unmask]> wrote:
>
> Dear Yann,
>
> See http://www.neuro.uni-jena.de/vbm/segmentation/modulation/ , which provides a good overview with regard to interpretation. In your case it would be "relative GM volume in region xyz after correcting for differences in brain size". It is not uncommon to go with unsmoothed data for ROI purpose, also make sure whether you want to use an intensity threshold for the ROI analysis (for VBM analysis one usually discards voxels with low GM values).
>
> Best
>
> Helmut
>
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