[FieldTrip] Electrode location structure

[Narayan P Subramaniyam]

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,
>
> Emma
>
>
>
> _______________________________________________
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> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
Hello

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.
Researcher/PhD student
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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