[FieldTrip] PLV/coherence on Neuromag gradiometer data

[David Ziegler]

Hi Fieldtrippers,

I am interested in analyzing PLV or coherence in my MEG data from a 
Neuromag 306 system.  In the past, for looking at power alone, I have 
calculated TFRs on the gradiometer data, then ran ft_combineplanar to 
average the gradiometer pairs.  Should I use the same approach for 
calculating the cross-spectral density, or does this create any problems 
when I go to combine the results for gradiometer pairs?  In particular, 
I am trying to wrap my head around how I would set up cfg.channelcmb if 
I want to look at all channel pairs, but then want to subsequently 
perform ft_combineplanar. (or maybe this is the wrong approach altogether?)

Thanks,
David

-- 

David A. Ziegler

Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology
43 Vassar St,46-5121
Cambridge, MA 02139

Tel: 617-258-0765

Fax: 617-253-1504

daz at mit.edu <mailto:daz at mit.edu>

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