[Mne_analysis] Connectivity calculation using PLI

[Fleur GAUDFERNAU]

        External Email - Use Caution        

Hello,

Thanks a lot for your help!

I actually want to z score connectivities for each subject. Is there a way to compute connectivity for each epoch in the source space? (I mean: a more efficient way than iterating over all epochs)

________________________________
De : mne_analysis-bounces at nmr.mgh.harvard.edu <mne_analysis-bounces at nmr.mgh.harvard.edu> de la part de Alexandre Gramfort <alexandre.gramfort at inria.fr>
Envoyé : mercredi 4 mars 2020 20:08:09
À : Discussion and support forum for the users of MNE Software
Objet : Re: [Mne_analysis] Connectivity calculation using PLI

        External Email - Use Caution

hi Fleur,

you cannot really transfer PLI from sensor to source. You need to estimate
PLI directly in source space eg using parcels.

here an example

https://mne.tools/stable/auto_examples/connectivity/plot_mne_inverse_label_connectivity.html#sphx-glr-auto-examples-connectivity-plot-mne-inverse-label-connectivity-py

or

https://mne.tools/stable/auto_examples/connectivity/plot_mne_inverse_psi_visual.html#sphx-glr-auto-examples-connectivity-plot-mne-inverse-psi-visual-py

note that the choice of the parcellation and metric has been the topic
of many papers
with various recommendations.

HTH
Alex

On Wed, Mar 4, 2020 at 11:35 AM Fleur GAUDFERNAU
<fleur.gaudfernau at pasteur.fr> wrote:
>
>         External Email - Use Caution
>
> Hi,
>
> I want to compute connectivity between sources using the PLI metric.
> As far as I understand it, PLI is computed at the electrode level and
> not at the source level. Does anyone know how to transform the
> connectivity matrix between channels into a connectivity matrix
> between sources? (I've looked at the inverse operator but I have no
> idea how to apply it to the connectivity matrix).
>
> Thanks,
>
> Fleur
>
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