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Dear Jaime, The values in the B-matrix are the estimated changes in coupling strength that you specified in your model under DCM.B. It contains both forward, backward, intrinsic (and lateral). Yes, the changes in connectivity are w.r.t. the values in the A-matrix. In the results GUI, these have been scaled to 100% and the changes in coupling is plotted as a scaling parameter expressed as a per cent. Note however, that the values are stored as log scaling parameters and these are the ones used for BPA, BMA and statistical inference. I hope this helps! Martin > On 5 Dec 2017, at 12.36, Jaime Delgado <[log in to unmask]> wrote: > > Dear all, > > The parameters in the matrix B are used to measure changes (modulations?) in the connections, compared to the reference condition, right?. The connectivity in the reference is modeled by A (appearing as 100% in the trial-specific effects) but A is two matrices, (forward and backward connections). What I would like to know is if these values in B indicate changes in the forward connections, the backwards, or is an estimate of the overall change in effective connectivity. > > In short, how to interpret the matrices B (for each one of the effects) in relation to A1 and A2? > > Thanks in advance. > > Best > > Jaime >