I am trying to understand the structure of my 1st level posterior covariance (GCM.Cp of each subject) following a spectral DCM analysis.
In total, I have 13 nodes (hence 169 parameters). I would have expected that the posterior covariance matrix of each subject should be 13X13, but instead it is 169X169. I am confused and was wondering why this might be the case. I hope you can help.