[Eeglablist] DIPFIT: different residual variances for spherical and boudary head models.

[Makoto Miyakoshi]

Dear Tomek,

2% vs 40% does not sound right. Maybe something failed for MNI model
fitting. Have you confirmed in the log that it converged successfully?

MNI is physiologically much more valid so I would recommend you use MNI for
template head.

Makoto


2014-04-16 8:15 GMT-07:00 Tomek Ligęza <tsl at poczta.fm>:

>  Dear list,
>
> I have an issue regarding different results when using the spherical
> (BESA) and the boundary (MNI) head models. Localisations of the dipoles are
> almost the same for the two models. However, the MNI model shows far
> greater residual variance for some dipoles compared with the BESA model.
> For example, the same dipole (from the same dataset) has RV = 2% for BESA
> model and RV = 40% for MNI model. This discrepancies can be seen mostly in
> the frontal regions of the brain.
>
> Does anyone know what causes this variation? Why the differences appear
> mainly in the frontal parts of the brain?
>
> Thanks in advance.
>
> Tomek
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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