[FieldTrip] plv and sourceanalysis

sibylle s.mohr at psy.gla.ac.uk
Thu Apr 7 16:10:12 CEST 2011

Dear Jan-Mathijs,

Yes indeed, it is freq-data (preprocessed by ft_freqanalysis).  
Apologies for the confusion.
Subsequently, we localized the effects using ft_sourceanalysis  
(cfg.method = 'dics') and identified regions of interest, which I'd  
like to use now for the connectivityanalysis
I assume in order to use plv I would need to run  
ft_connectivityanalysis at the freq-level.
Anyway, thanks a lot for your help!
I will have a look at the ft_connectivityanalysis options.

Thanks again & best wishes,


On 7 Apr 2011, at 13:28, jan-mathijs schoffelen wrote:

> Dear Sibylle,
> You confuse me a bit. You mention ft_sourcedescriptives in  
> combination with freq data. Do you mean that you have source-level  
> data in the frequency domain, or do you have freq-data, as in sensor  
> level data having been processed by ft_freqanalysis? In the former  
> case, I do not recall that ft_sourcedescriptives could compute a  
> plv. In the latter case: it was indeed supported by  
> ft_freqdescriptives.
> A while ago we moved the functionality of ft_freqdescriptives  
> dealing with coherence/plv etc to ft_connectivityanalysis. So I'd  
> suggest to have a look there. Also, I think it should be possible to  
> use ft_connectivityanalysis to compute source level plv, but this  
> may still need some tweaking.
> Best wishes,
> Jan-Mathijs
> On Apr 7, 2011, at 12:55 PM, sibylle wrote:
>> Dear Fieldtrippers,
>> I have a couple of question and I hope someone can help me:
>> How is it possible to compute plv (for freq data)?
>> As far as I can remember there used to be an option within  
>> ft_sourcedescriptives, which seems to have disappeared.
>> How can one use plv to determine connectivity in source space?
>> Thanks a lot & best wishes,
>> Sibylle
>> _______________________________________________
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>> fieldtrip at donders.ru.nl
>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> Dr. J.M. (Jan-Mathijs) Schoffelen
> Donders Institute for Brain, Cognition and Behaviour,
> Centre for Cognitive Neuroimaging,
> Radboud University Nijmegen, The Netherlands
> J.Schoffelen at donders.ru.nl
> Telephone: 0031-24-3614793
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

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