Dear list, I have a question concerning the "replicate over sessions" option in the contrast manager in batch, SPM5. I created a .mat file with contrast manager settings. My design matrix contains 4 sessions, 2 trials per session. I also included time and dispersion derivatives and realignment parameters as regressors. So I have 12 columns per session in the design matrix. In contrast manager - contrast sessions, it is possible to replicate a T-contrast ("Create per session"). However, SPM adds resp. only two, four and six zeroes for the other three sessions, instead of 12, 24 and 36 zeroes. I think this is because in the SPM.mat file only two trials per session are saved and the derivatives and rp-regressors are not taken into account. Does anyone have experience with this finding? Is there a possibility to correctly replicate per session (replicate defined contrast after 12 columns instead of 2)? Is there another way to change the number of added zeroes? Or should I define all T-contrasts for each session individually? Thanks for your remarks. Benedicte -- Benedicte Descamps, MSc, PhD Student Ghent University Hospital Dep. of Neuroradiology, -1 K12 IB (5th August: DGL, room 022) De Pintelaan 185 9000 Ghent Belgium T +32 9 332 69 34 F +32 9 332 49 69