[FieldTrip] Antwort: Re: Easycap 128 XYZ coordinates

m.goeldi at psychologie.uzh.ch m.goeldi at psychologie.uzh.ch
Tue Dec 2 10:47:52 CET 2014


The 129 channel version includes the Cz electrode, the 128 version does not.

Unfortunately these electrode positions did not work well for me. I assumed the coordinates are in MNI space (and I might be wrong here). But when I fit it to the template of the MNI head the electrodes do not match. The frontal part is ok, but the parietal electrodes disappear into the head. Looks like the reference head is too small. The electrode positions have to be rearranged manually.

I found a template file in spm12 (might also be around in spm8) in ./spm12/EEGtemplates/egi128_GSN_HydroCel.sfp (here the 128 version includes the Cz electrode). This fits perfectly onto the MNI template head.

Maybe someone with more experience can verify this discrepancy?


University of Zürich
Maurice Göldi
Department of Psychology
Binzmühlestr. 14 / Box 5
CH - 8050 Zürich

Tel. +41 (0)44 635 74 55
maurice.goeldi at uzh.ch

-----fieldtrip-bounces at science.ru.nl schrieb: -----
An: FieldTrip discussion list <fieldtrip at science.ru.nl>
Von: Robert Oostenveld 
Gesendet von: fieldtrip-bounces at science.ru.nl
Datum: 02.12.2014 09:41
Betreff: Re: [FieldTrip] Easycap 128 XYZ coordinates

Dear Rajat,

You can find one in fieldtrip/template/electrode/GSN-HydroCel-128.sfp. Note that there is also a 129 channel version, I don’t know the detailled difference. See http://fieldtrip.fcdonders.nl/template/electrode for the documentation.

best regards,

On 01 Dec 2014, at 15:31, Rajat Thomas <r.thomas at nin.knaw.nl> wrote:
​Dear all,

Is there anywhere I could download a Easycap 128 channel electrode
coordinate file? On the website of easycap there is only the 64 channel.



Rajat Mani Thomas
Social Brain Lab
Netherlands Institute for Neuroscience
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