Hell0 SPM Experts,
This may be a relatively elementary question, but I would appreciate any assistance available. I am working with a library of task-activated PET scans, and I have a contrast of task condition (experimental > control). I also have two groups (patients and controls), and I would like to compare this contrast across groups. I have been successfully able to view the contrast within each group, but am puzzled by how to analyze the between-groups comparison. How would I set up my design and/or contrasts to best observe this?
Many thanks in advance,
-Mike Sugarman
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