Dear SPM experts,
I have some rather unexpected results. I not continuous cold pain task we achieved at the group level significant increase of the signal in white matter (see pictures 1 and 2 for group results). The strange issue it that it is present there not along with gray matter responses, but INSTEAD of them. This appears to be not the because of the smoothing or normalisation of the data. We smoothed only 6mm. The FEW<0.05 significant voxes in WM appear also the individual level (see pictures 3 and 4).
I would appreciate any suggestions for interpretation and useful references!
Thank you in advance!
Sincerely yours,
Vladimir
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