Dear List,
I`ve got a problem mapping SPM8 t- and F-contrasts to Caret surfaces.
Unfortunately I even don`t know if it is possible to map SPM8 images to
Caret as haven`t found any informationen on the compatibility of both
programs (even on the list). Is there a difference between SPM5- and
SPM8-space that has to be accounted for when projecting activations?!
I`m asking because I ran across the following problem:
I processed data to map activations using the Tutorial_Sept_06 (provided
on the Sumsdb site) click by click with the
Human.PALS_B12.BOTH.TEMPLATE-for-fMRI-MAPPING.73730.spec-file (is this
approach still the standard of mapping functional files to volumes?).
When I mapped an F-contrast (spm_F.hdr and .nii) on an inflated brain
there where more spots (and some spots in strange locations) on my
MFM-image than on my SPM. When I mapped a t-contrast (spm_T.hdr and
.nii) all activations were gone! When lowering the threshold also this
(T-)map is showing activations that can be expected from my SPM but also
"new" acitavtions. The MFMs were thresholded with my SPM t/F-treshold
and the treshold type in Caret set to "column" (does this acutally mean
that just the information (t/F-values) form the the spm_T/F image is
read without any changes to the threshold by Caret? I infered that from
posts I read but I´m not yet definitively sure). As suggested in another
post I also used different algorithms (e.g. Metric-Gaussian). However
the result is still the same. I´m most concerned about strange
activation foci that I won`t find in my SPMs.
Is there anything I did wrong?! Any hint or help would be greatly
appreciated.
Thanks & best regards
Raphael
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