Dear SPM experts,
I am trying to apply the functions in 'spm12/toolbox/NVC' at our MEG and fMRI data to examine the contribution of 4 neuronal populations to brain activation during performing task (as introduced in the paper 'Comparing dynamic causal models of neurovascular coupling with fMRI and EEG/MEG'). SPM file of the 1st-level GLM for fMRI, time series from two ROIs and DCM for MEG were fed into 'spm_dcm_nvc'. However, when run the code '[Ep,Cp,Eh,F] = spm_nlsi_GN(M,U,Y);' (line 195 in spm_dcm_nvc) it echos 'Error using spm_nlsi_GN Convergence failure.' It seems like this error is caused by the wrong M, U and Y but I do not know how to check it. Any suggestions? Many thanks.
Best,
Li Zhi
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