Dear SPM-experts,
I am analysing longitudinal fMRI data (pre- and post-test) in two groups (treatment/placebo group) using SPM. For each group, I have a task consisting of three different conditions and I am interested in whether there are any changes between the two groups in the three task conditions over time, i.e. the three-way interaction of Group X Condition X Time. I used the flexible factorial design with the factors Group, Conditions and Time to address the described three way interaction. However, I am not able to enter the according interaction term in the SPM batch. Generally, I am not sure whether this is a good approach to address the interaction between Group X Condition X Time and I am wondering whether there are other ways to test for this interaction.
Any thoughts and comments are highly appreciated!
Thanks,
Else
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