Dear Norbert,
If you do not check the B diagonal the connections are fixed in the
sense that they are not allowed to vary to explain differences between
conditions. They are still optimized by the inversion though. The
reason these connections do not appear in A is that it would not make
sense to remove them completely.
Best,
Vladimir
2008/11/15 Norbert <[log in to unmask]>:
> Hi,
> I have a question with respect to DCM analysis of EEG ERP data. In the
> neuronal model B matrix by checking the diagonal, you can allow for changing
> of intrinsic connections in an area of interest. However, you do not
> indicate these intrinsic connections in any of the A matrices. My question:
> If in B you do not check the diagonal does the model computation assume that
> the intrinsic connections are fixed, even though they are not checked in the
> A matrices?
>
> Norbert Jaušovec
> Filozofska fakulteta,
> Oddelek za psihologijo
> Univerza v Mariboru
> Koroška 160, 2000 Maribor
> Tel: +386 2 2293606
> GSM: +386 41 387834
> [log in to unmask]
>
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