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Dear Anthony, I have a feeling this may relate to a bug which has been fixed in the latest update of SPM8. Please could you download the update dated 04-Feb-2013 and see if that fixes the problem? You will need to recompute your results. Updates are at http://www.fil.ion.ucl.ac.uk/spm/software/spm8/#Updates . Best, Peter. > -----Original Message----- > From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] > On Behalf Of Anthony Atkinson > Sent: 02 May 2013 11:43 > To: [log in to unmask] > Subject: [SPM] Interpretation of DCM post hoc network discovery results > > Dear DCM experts > > I am puzzled about the relationships between certain parts of the > output produced by the DCM post hoc network discovery function > (spm_dcm_post_hoc). In particular, the graphs of the connectivity > structure that are produced (in anatomical and functional spaces) do > not seem to correspond to the network that is represented by the > Bayesian parameter average values (from DCM.Ep stored in DCM_BPA.mat) > and their associated posterior probabilities (from DCM.Pp stored in > DCM_BPA.mat). For the DCM post hoc analysis that I ran, I got graphs > that show a connectivity structure that has many more connections > between nodes than the number of connections identifiable from the > DCM.Ep.A and DCM.Ep.B matrices combined (i.e. the connections with non- > zero BPA values and non-zero posterior probabilities). > > Could someone please help clarify this for me? > > Regards, > > Anthony