[Mne_analysis] PLV in label in source space

[Alexandre Gramfort]

hi,

thanks for sharing these insights. Any suggestion to make this straightforward
and update/deprecate source_induced_power is welcome.

Laetitia if you can/want to share a gist it would be great.

Alex


On Fri, Sep 19, 2014 at 4:54 PM, Ghuman, Avniel <ghumana at upmc.edu> wrote:
> Dear Laetitia,
>
> Generally I find that spatially averaging across the label, then calculating the PLV works better.
>
> Best wishes,
> Avniel
>
> From: Laetitia Grabot <laetitia.grabot at gmail.com<mailto:laetitia.grabot at gmail.com>>
> Reply-To: Discussion and support forum for the users of MNE Software <mne_analysis at nmr.mgh.harvard.edu<mailto:mne_analysis at nmr.mgh.harvard.edu>>
> Date: Friday, September 19, 2014 10:27 AM
> To: "mne_analysis at nmr.mgh.harvard.edu<mailto:mne_analysis at nmr.mgh.harvard.edu>" <mne_analysis at nmr.mgh.harvard.edu<mailto:mne_analysis at nmr.mgh.harvard.edu>>
> Subject: [Mne_analysis] PLV in label in source space
>
> Dear all,
>
> When calculating the phase-locking value (PLV) from n trials in a label in source space, I'm wondering if it is more relevant to:
> - spatially averaging the trials across the label, then calculated the PLV.
> - calculating the PLV on each source then averaging the PLVs across the label.
>
> I compared the two methods, and things change a lot (the PLV is larger when the average is done at the level of the trials than when it's done at the level of the PLVs). I would have the feeling that averaging the trials first is more relevant, especially if using svd, so that the averaged signal is more robust. Could someone confirm/contradict my feeling?
>
> Thanks in advance,
> Laetitia G.
>
>
>
>
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