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Hi dear all, I am working on ERP data and I want to use DCM to model the differences between 2 trials. I want to know how the effect vector (between trial effect) affects the equations of the model? I have read the related paper [1] but yet it is ambiguous for me. Can any one help me? [1] David, Olivier, Kiebel, Stefan J, Harrison, Lee M, Mattout, Jérémie, Kilner, James M, Friston, Karl J "Dynamic causal modeling of evoked responses in EEG and MEG" *Neuroimage, *2006*.* Best regards, Pinar