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Dear SPMexperts, I am having a hard time understanding how to include the time and dispersion derivatives in my model. I have 5 conditions and I added the time and dispersion derivatives in my model at the first level. If I want to create a contrast comparing the first and the second condition, do I have to create a T-contrast that looks like this [1 0 0 -1 0 0] or an F contrast which looks like this: [1 0 0 -1 0 0 ; 0 1 0 0 -1 0; 0 0 1 0 0 -1] Thank you in advance, Ariadna