[FieldTrip] source localising activity coherent with muscle channels not present in leadfield

[Kirstin Heise]

Dear FieldTrip community, 

I am following the pipeline of the  http://www.fieldtriptoolbox.org/tutorial/beamformingextended/#loading-of-the-data <http://www.fieldtriptoolbox.org/tutorial/beamformingextended/#loading-of-the-data> tutorial to source localise EEG activity that is coherent with muscle/EMG channels. I have a pre-computed leadfield (using simbio), which does not include the muscle channels that I want to use. 

When attempting to run ft_sourceanalysis, I receive the following error message: 

Error using ft_sourceanalysis (line 542)
There's a mismatch between the number/order of channels in the data, 
with respect to the channels in the precomputed leadfield/filter.
This is not easy to solve automatically. Please look into this.

Is there a way of solving this post hoc? I am not sure which information is required in which part of the leadfield structure. I saw that in the tutorial data set, there are more sensors in the data set than included in the forward model and wonder whether it is just a matter of adding the additional channels “somehow” in the forward model? 

Also, not having interpolated bad channels and hence having a different number of channels in the EEG data set, at what point can I control the numbering/order of the actual channels in the source reconstruction procedure? 

Thanks a lot for your support. 
Best, 
Kirstin



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