Dear SPMers,
I have a group of subjects who have been scanned on two occasions, once in the presence of drug and once on placebo (double-blind). On each occasion they are performing a task. I want to explore the interaction of drug with task in SPM99b but want to set up the design so that the analysis reflects that these are the same individuals acting as their own controls. In the multi-group conditions and covariates design, I don't seem to be able to set this up. Is there another way of setting up the design?
With thanks in advance
Stephen McGowan
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