[FieldTrip] ROI selection in a GC analysis

Stolk, A. a.stolk at fcdonders.ru.nl
Tue Dec 11 22:17:57 CET 2012

Dear Marco, Just a quick thought; would it be appropriate to select your ROI by using the cluster(s) that 'survived' non-parametric testing (i.e. using the .mask field that points to statistically significant voxels/sensors) ? Or perhaps based on previous findings in literature or by yourself? H ave a look at ft_volumelookup for that matter . Perhaps someone else has more experience facing the issue of ROI definition for granger purposes. With respect to your question regarding 'FARM'; I do not know whether it is on the menu or going to be. If you happen to have some lines of code for it, we'd be happy to implement it of course. Hope this was of any help, Arjen ----- Oorspronkelijk bericht -----
> Van: "Marco Rotonda" <marco.rotonda at gmail.com>
> Aan: "fieldtrip" <fieldtrip at science.ru.nl>
> Verzonden: Dinsdag 11 december 2012 21:41:22
> Onderwerp: [FieldTrip] ROI selection in a GC analysis
> Dear fieldtrip experts,
> I'm sorry to ask again to the list the same question but I had no
> answer and I still have not solved my questions.
> I would like to ask you if there is an elegant solution in the
> selection/definition of the ROI for a Granger Causality analysis.
> Just to explain better my doubts.
> Let suppose i've the sources reconstructed in the temporal domain
> and/or in the frequencies domain.
> If now I wish to perform a GC analysis I should know the ROI or
> sources on which to perform it.
> As far as I've seen most of them are selected with an a priori
> knowledge.
> I would like to know if there is a way to define the ROI from the
> data, not from my (eventually with bias) knowledge.
> As far as I've searched the only method developed is the Full-brain
> auto-regressive modeling (FARM).
> http://www.ncbi.nlm.nih.gov/pubmed/21439388
> Since there are already ft_mvaranalysis and ft_connectivityanalysis,
> do
> you think that is possible to integrate the FARM approach into those
> functions?
> I'm sorry but I know my limitations and I don't know how to do it.
> I hope this could be useful not for me only.
> Regards,
> Marco
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20121211/304a08b3/attachment-0002.html>

More information about the fieldtrip mailing list