[Mne_analysis] Visualizing power spectrum density of sources on the brain

[Gladia Hotan]

Thanks Alex!

I am wondering why when I plot the psd on the brain I get a lot of activity
in the corpus callosum and white matter rather than in the grey matter,
which is where the sources are localized to. Here is a link to example
screenshots of the source distribution vs the psd distribution on the
brain, which don't seem to match:
https://www.dropbox.com/sh/blstn3xitewbg5t/AACia--q9mF6d0ZjluhXq_TGa?dl=0

 How can I check that the source psd is being plotted correctly?

Thanks and Best,
Gladia


On Tue, Jul 5, 2016 at 4:54 PM, Alexandre Gramfort <
alexandre.gramfort at telecom-paristech.fr> wrote:

> > Could anyone explain why MNE should be used instead of dSPM to get the
> power
> > plots? The tutorial on the MNE website says to use dSPM as the solver.
>
> dSPM is just a normalized/scaled version of MNE (scaling is obtained
> form the noise standard deviation derived from the noise cov). So
> basically it's just a scaling factor. If you apply a baseline /
> contrast with a log ratio of power then there is no diff between the
> 2.
>
> HTH
> Alex
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