Hello Peter,
you might also want to split the whole series into two sessions, and thus exclude the "bad" scans completely. First session would go from scan 0 to about 80, second session from scan 90 to the end (scan 140?).
I'm not sure whether it is that good an idea in your case, as the two sessions would not contain that many scans. When building contrasts, you would also have to weight the sessions in a different way, corresponding to the different length of the sessions or the different numbers of blocks inside.
Best,
Gabor
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