[Eeglablist] MEG channel locations

[Robert Oostenveld]

Dear Nathan,

EEGLAB has in it's main EEG structure a field EEG.chanlocs, which  
contain the channel locations used for topoplotting. The dipfit  
routine needs more information besides the channel locations, namely  
also the number and location of the coils that compromise a  
gradiometer channel and the orientation of the gradiometers. In  
dipfit you can specify the 'chanfile', i.e. the file with the channel  
information (in the case of CTF that would be the res4 file, in the  
case of neuromag a fif file). I am not sure though exactly how the  
dipfit plugin would deal with MEG data: the underlying dipolefitting  
function from the FieldTrip toolbox can work with MEG data, but  
EEGLAB sometimes tries to be "smart", which might not always work  
with MEG data.

best regards,
Robert


On 20 Jun 2006, at 18:12, Nathan Dees wrote:

> All,
>
> I will soon be analyzing MEG data and currently have no experience  
> with MEG.  When one imports MEG data and uses the EEGLab tools and  
> functions, I am curious if MEG channel locations are included as  
> standard setups.  If one uses EEGLab to locate dipoles with MEG  
> data, does EEGLab have typical MEG squid locations for different  
> machines built in to search for as with EEG?
>
> Thanks in advance,
>
> Nathan Dees
> Ph.D. student, UMSL
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