[Mne_analysis] cortical ribbon constrained 3d source space

sheraz at nmr.mgh.harvard.edu sheraz at nmr.mgh.harvard.edu
Sun Nov 11 10:46:24 EST 2012
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Dear Octavian,

Matti might answer better, but in my experience, BEM can become unstable
in ecog, as sensors are very close to the cortical manifold.

Sheraz

> Dear Matti,
>
> I am working with an ecog based BEM and need to define the source space.
> You are right, the differences between the cortical ribbon and surface are
> small. What I want to do in the end is to create a source space consisting
> of a denser grid for the cortical ribbon (or surface, as you pointed out),
> and sparser (reduced, kind of adaptive) for the rest of the brain volume
> (deep nuclei, wm).
>
> Can this be done, such as running the mne_volume_source_space twice, with
> boundaries, say ?h.pial, and ?h.white with denser and sparser grid,
> respectively, then removing the inner source layer generated with ?h.pial?
> Alternatively, do you see combining the output of the
> mne_make_source_space
> with pial surfaces (dense), and the mne_volume_source_space with ?h.white
> (sparse)?
>
> Another related question, do I have to combine the lh and rh boundary
> surfaces (such as pial or white) when using mne_volume_source_space, or do
> I run the command twice for each side?
> Thank you very much,
>
> Octavian
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