[FieldTrip] Electrode location structure

[Robert Oostenveld]

Hi Emma

Narayan and Arjen already pointed you in the appropriate direction. Just to clarify their emails, FieldTrip uses a layout structure for 2-D plotting of data, and the electrode structure for a 3-D representation. The electrode structure can be converted to a 2-D layout, but can also be used for source reconstruction, for which the layout is useless.

Please see
http://fieldtrip.fcdonders.nl/faq/what_is_the_format_of_the_layout_file_which_is_used_for_plotting
http://fieldtrip.fcdonders.nl/faq/how_are_electrodes_magnetometers_or_gradiometers_described
and pointers to other documentation therein.

Also these new pages
http://fieldtrip.fcdonders.nl/template/electrode
http://fieldtrip.fcdonders.nl/template/layout
might help.

best
Robert


On 14 Jan 2013, at 21:14, 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
> 
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip