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Dear all, If I have two scans. One with 2 points regressored as parametric modulation and one with 4 points. I want to compare the first order effects of them in terms of the fitting lines. Would it be correct and possible if I take the contrast estimate and T scores and do comparisons between them? If what is the best way of doing this? I got the contrast and T values from ROI's using marsbar. Regards, AS