Dear Dr. Flandin,
Thank you for the reply.
I wonder whether there are any other ways to force SPM to include all the co-variates in the parametric modulation. Although all the co-variates are correlated with each other, I still want to see which one of the co-variates predicts the brain activation the best. I really appreciate your help on this. Thanks!
Sincerely,
Veda
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