[FieldTrip] PLV with DICS beamformer

[Natalia Zaretskaya]

Dear FieldTrip experts,

I would like to be able to compute the phase-locking value (Lachaux, 1999) using source data derived from disc beamformer.

Right now I perform ft_sourceanalysis with 
cfg.method = ‘dics’;
cfg.refdip = [x y z];
cfg.rawtrial = ‘yes’; 
cfg.keepcsd = ‘yes’;
cfg.grid.filter = source.avg.filter; %  precomputed common filter for two conditions

and then use the imaginary part of the single-trial cross-spectral densities to compute PLV “by hand”. Cross-spectra at each position have a 3x3 format, so I compute the PLV for each dipole orientation pair and then average.

I was wondering whether 1) the above procedure is technically correct and 2) whether there is a better, more efficient way to do it (I assume plv can be derived at the same step where source.avg.coh is computed?).

Many thanks in advance!

Best regards,
Natalia Zaretskaya

---
Dr. Natalia Zaretskaya
Centre for Integrative Neuroscience
Vision and Cognition Lab (AG Bartels) 
72076 Tübingen, Germany
natalia.zaretskaya at cin.uni-tuebingen.de
phone: +49 7071 2989032



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20140401/1bb27312/attachment-0001.html>