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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