[FieldTrip] using megplanar on cross-spectra

Mark Drakesmith DrakesmithM at cardiff.ac.uk
Fri Nov 14 14:29:29 CET 2014

Dear FieldTripers

I want to ask a quick question about applying megplanar to cross-spectra
and coherence data. I want to compute sensor-sensor connectivity after
the planar transform. I can do this quite easily after doing the initial
planar transformation (run ft_megplanar and ft_freqanalysis). However,
when I combine the channels after ft_freqanalysis using
ft_combineplanar, the crssprtm field is no longer there, only the
powsptrm. I havn't tried it with the coherence spectrum yet but I'm
guessing the same thing will happen there.

I dont want to work on the full uncombined planar data as this is quite
expensive in terms of computer resources and harder to visualise. Does
anyone have advise on how best to get planar-combined cross-spectra and

Many thanks


Mark Drakesmith
CUBRIC / NMHRI, Cardiff University

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