Dear SPMers,
I am trying to model my fmri data. We have run 4 functional sessions. With 3 conditions in each session different from the other sessions, so a total of 12 conditions. With movement regressors and time modulation Conceptually it is designed to be a 3*4 factorial design (3 different stimuli * 4 different tasks).
When I specify this factorial design, matlab would not run it (the matrix does not correspond to.....), so contrasts aren't created automatically.
What should I do?? Should I manually create a contrast for each condition (F contrast, t contrast???) and then do a factorial at second level?
Any help with this will be greatly appreciatted.
Best
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