[FieldTrip] Electrode location structure
Narayan P Subramaniyam
narayan.ps at tut.fi
Mon Jan 14 21:43:26 CET 2013
On 14/01/2013 22:14, Emma Holmes wrote:
> Dear FieldTrip users,
> I would like to define the positions of the EEG electrodes myself.
> I have a structure containing the x,y,z co-ordinates and channel names
> for 66 channels. However, I am having trouble converting this to a
> FieldTrip structure.
> I'm trying to use the ft_prepare_layout() function.
> Can anyone tell me what format the input structure should be in? i.e.
> what fields it should contain.
> Here, I'm referring to the part of the documentation 'cfg.elec:
> structure with electrode positions', but can't seem to find any
> explanation of what the layout of this structure should be.
> Many thanks,
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
First create a structure called elec with two fields in int
elec.pnt -> N x 3 matrix -> electrode positions
elec.label - > 1 x N cell -> electrode label
Then you can write the following script
cfg = 
cfg.elec = elec;
lay = ft_prepare_layout(cfg, data);
where data is as provided by ft_preprocessing etc
Hope this works.
With Best Regards,
Narayan P Subramaniyam, M.Sc.
Department of Electronics and Communications Engineering
Tampere University of Technology
Finn-Medi 1, 4th Floor, Room 203
Biokatu 6, FI-33520 Tampere, Finland
Tel: +358 (0)40 198 1951
E-mail: narayan.ps at tut.fi
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