[FieldTrip] beamformer and granger casuality

[Tzvetan Popov]

Dear Tyler,

‘mom’ refers indeed to a moment, yet not a moment in time (-domain) but a dipole moment. The modeling of brain activity at location  X as dipolar activity at that location is used in many inverse solutions including spatial filtering. You can specify cfg.keepmom = ‘yes’; and subsequently call ft_sourcedescriptives with cfg.projectmom = ‘yes’; in order to obtain the dominant orientation. 
good luck
tzvetan


> Hello fieldtrip,
> 
> I was just wondering whether it was possible to perform a beamformer analysis on some EEG data and then perform a connectivity analysis on the source using the granger casuality method. Currently I am following the connectivity/extended tutorials and just doing granger casuality connectivity analysis on EEG data (ft_mvaranalysis-ft_freqanalysis-ft_connectivityanalysis) and its working fine, just curious to see if it works on beamformed data.
> 
> From what Ive tested so far, ft_connectivityanalysis seems to want a 'mom' field, which doesnt appear to be present when you conduct a DICS beamformer (I am aware 'mom' refers to moment, which is in the time domain).
> 
> Regards,
> 
> Tyler
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