[Eeglablist] electrode locations shifted when using headplot on EGI's GSN-HydroCel-128.sfp

[Makoto Miyakoshi]

Dear Kirti,

Can you tell us which system generated the .data file?

Makoto


2013/8/13 Kirti Srivastava <kirti.sri1987 at gmail.com>

> can please any one tell me how i can open . DATA file into MATLAB.
>
>
> On Tue, Aug 13, 2013 at 7:02 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>wrote:
>
>> Dear Ingrid and Arno,
>>
>> If you are using the template channel locations and not the digitized
>> ones, I don't why you got such a strange plot (actually I don't even know
>> if your plot is wrong).
>>
>> The 3D plot head model should have undergone a revision recently. Let me
>> ask Arno if he knows anything about it.
>>
>> Makoto
>>
>>
>> 2013/8/7 Ingrid Nieuwenhuis <ingrid.nieuwenhuis at gmail.com>
>>
>>>  Hello everyone,
>>>
>>> I am trying to make a beautiful 3D topoplot on the head using headplot.
>>> I have 128 channel EGI data, GSN-HydroCel-128.sfp layout. When I plot the
>>> electrode positions they are not correct, see the picture here:
>>> https://www.dropbox.com/s/g4b1uvwlgof63cm/headplot_GSN-HydroCel-128.jpg.
>>> It looks as if the net is not pulled down enough: the electrodes that
>>> should be on the cheeks way under the eyes are located on the eye balls,
>>> and also the ear in the picture is not in the ear hole of the net. All the
>>> electrodes are too high up.
>>>
>>> I've created the spline file with the option 'sfp' for 'filetype' as I
>>> read that sfp data format is supported. I used the standard EGI electrode
>>> location file GSN-HydroCel-128.sfp, after removing the FidNz, FidT9, FidT10
>>> place holders. Does any one know why this happens, and how I can fix it?
>>>
>>> I'm new to EEGlab (normally use FieldTrip). I haven't used the GUI but
>>> used code:
>>>
>>> % step 1 create spline file
>>> elocs =
>>> readlocs('C:\Users\Ingrid\Documents\MATLAB\FieldTrip\template\electrode\GSN-HydroCel-128.sfp',
>>> 'filetype', 'sfp');
>>> splinefile = [cur_path_MLD, 'EEGLAB_splinefiles', filesep,
>>> 'EGI_128.spl'];
>>> headplot('setup', elocs, splinefile);
>>>
>>> % step 2 test the electrode locations
>>> splinefile = [cur_path_MLD, 'EEGLAB_splinefiles', filesep,
>>> 'EGI_128.spl'];
>>> figure;
>>> headplot(rand(128,1), splinefile)
>>>
>>> Thanks a lot!
>>> Ingrid
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
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>
>


-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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