Dear fellow SPMers,
I recently ran statistics using SPM with 12 mm smoothed VBM images. When I
looked at the results, the SPM.mat's .FWHM is a vector of numbers less than
1 (I think they should be around 12)? Also, there are .1 voxels per resel
(or ~10 resels/voxel). I was under the impression that there should be
more voxels than resels in the image.... so I'm confused by these numbers.
As a result of SPM thinking my data is very "rough", my expected cluster
size is less than 1 voxel, making any significant voxel show up as
significant in the cluster-size test. Does anyone have an idea of where I
might have gone wrong? Is my understanding of the numbers I should have
obtained correct? Thanks in advance for any advice.
Lynne
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