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Dear SPMers, I have 10 runs in one of my data,in first 7 runs, I have three tasks conditions (say A, B and C) and remaining three runs I have two tasks ( A and B, same task as before). After first level analysis, I have extracted beta parameters using marsbar form a a ROI. However, I noticed that beta values for task A ( and B too) from run 1:7 are smaller compared to beta for same task A ( and B) but from run 8 9 and 10th run. So does it because of there are 3 conditions in first 7 runs to model and 2 conditions in last 3 runs ? If yes, is there anyway to normalize ... or something to take care of these differences.. Any suggestions would be helpful :) Thanks Mark