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

[Tomek Ligęza]

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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