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Hello, I would like to set up a feat analysis and after reading the examples and going through previous posts I'm still not sure how to set this up. I have 3 groups (10 subjects in each group) and 3 separate scans (for each subject) and I've run individual first-level analyses on all 90 scans. I wanted to look at group effect, scan effect and, if possible, the interaction between group and scan. It seems to me that I need: 2 columns to model group differences, 2 columns to model scan differences, 3x9 columns to model differences between subjects in each group 1 f-test across columns 1 and 2 to get group effect 1 f-test across columns 3 and 4 to get scan effect. Does this sound correct? Second question: how can I model the interaction? Third, I also want to set up contrasts to look at the specific differences between groups and scans (group1-group2, scan1-scan2, etc.). The example for the "tripled" t-test in the website sounds like I want to do, at least with the scan differences where there's repeated measures, except that I am not modelling subject means, so I'm not sure how that affects the rest. And I'm also not sure the line of thinking is the same in the group differences... Can I have some help with this? Or, is there a better way to find this effects/differences? Thanks in advance for your help, Catarina