[Eeglablist] Importing channel locations from Neuroscan (3DSpaceDX)

[arno]

Sara Graziadio wrote:
> EEGLab users,
>
> I tried to import channel locations from Neuroscan (Scan 4.2) into
> EEGlab but I have had some problems. I was wondering if you could help
> me.
> I recorded electrode positions and head shape with Fastrak (Polhemus)in
> the 3DSpaceDX in Neuroscan and I saved them to a .3dd file. I tried to
> import the data in EEGlab choosing the Polhemusx format (as I was
> working in the X positive hemisphere) but I had an error: "readlocs:
> error reading Polhemus coords. If Besa .elp file force file type to
> BESA". I tried to save the data to a .elp file in Neuroscan and import
> it again. When I imported the file in the Polhemusx format I had the
> same error like before, whereas when I tried with Besa format (.elp), it
> seems ok (I didn't had any error)but I didn't have my channel locations,
> no XYZ coordinates, just numbers in the polar angles that looked like
> random. I tried also to use autodetect when asked for file format but
> nothing happened, no coords and these warnings on Matlab command window:
>   
Read your BESA file using the function

eloc = readlocs('myfile.elp', 'fileformat', 'besa');
pop_chanedit(eloc);

Hope this helps,

Arno

ps: if this does not work, send us your besa file