thanks for your quick reply. The Tasks array seems to be fine now but I'm still having problems with the contrasts. However, I'm not getting any errorvalues. The model seems to be properly defined and estimated. Unfortunately no contrasts are written. SPM always returns "PPI Contrasts were not estimated for some reason". I've just defined a single contrast: P.Contrasts(1).left={'A'}, P.Contrasts(1).right={'B'}. The same thing happens if I follow the online manual and just leave Contrasts blank.
Thanks in advance!
Felix
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