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Dear FSL experts, after studying the FSL webpage it still remains unclear to me how to construct a design matrix in the following case (using GLM for further processing with randomise): 3 groups of subjects (control, intervention 1, intervention 2) underwent 2 fmri scans (pre-intervention, post-intevention). The question is: Do the post-intervention means, adjusted for pre-intervention scores, differ between the 3 groups? Does anybody know how to solve this problem with FSL? Thank you very much for your suggestions!