Dear Vladimir,
tested the fix with several projects, it seems to work fine. One related
question: spm_cond_units.m was changed, which is also used by
spm_robust_average.m and spm_robust_glm.m. Could this create problems?
And, not unrelated, but something that has been long on my mind:
If I want to make a group analysis, bringing the final images as
1st-level results, can I use use them in the same way I would use the
beta images from fMRI? Do these intermediate re-scalings, and different
temporal modes across subjects induced different scales in the image values?
I used to think that group inversion was necessary, else they would have
different spatial modes. But how can statistics even be done in a group,
if the units are lost and "effect size" does not have the same meaning
as in fMRI?
Best
Erick
On 2012-05-08 23:51, Vladimir Litvak wrote:
> Dear Stephan and Erick,
>
> Please try the attached fix for the problems with lead field scaling.
> It does seem to improve things on our example. It'll be in the next
> SPM8 update.
>
> Vladimir
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