Dear all,
I tried to conduct an ANCOVA with one sample of 72 particpants: fMRI contrast images as input; VBM images as covariate (GM c1-image). The analysis was completed without an error message. But the resulting output is very strange:
3 beta images, of which the second one is empty (only containing zeros). The SPM insertion tool also produces an empty image (when I try to define a contrast for the fMRI activation conrolling for GM density).
Does anybody have an idea what could be wrong?
And why are there three beta images? I would have expected only two (one for the fMRI and one for the VBM regressor).
Many thanks in advance!
Sabine
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