[Eeglablist] channels location for egi 128 electrodes net

[Morgan Hough]

If you are using an EGI net then these values won't be of much use as EGI
doesn't use 10/20 system coordinates (or extensions of them). Check
that you have a new (2nd generation) EGI cap and I will try and find a
.loc file I have (although I think I got it from Salk orignally). If you
bought the net recently then it is a new layout but you can always check
with EGI customer support if you aren't sure.

These positions are very useful for many quik-caps, electrocaps, etc. but
the latest Neuroscan quik-caps (certainly at 128 and 256 electrodes) also
break with the 10/20 system.

Take care.

-Morgan

On Fri, 17 Jan 2003, Darren Weber wrote:

>
> Hi Lionel,
>
> the attached coordinates were generously given to me by Robert Oostenveld,
> as they correspond with this publication:
>
> Oostenveld, R., & Praamstra, P. (2001).  The five percent electrode system
> for high-resolution EEG and ERP measurements.  Clinical Neurophysiology,
> 112: 713-719.
>
> I think the 3D coordinates lie on a unit sphere.  I've formatted the values
> in the Neuroscan 3Dspace ascii format.  It is easy to read, with each line
> consisting of an electrode name, a 3D space code, and XYZ float values.
>
> You can pick out what you need once you identify where your electrodes fit
> into this extended schema.
>
> Cheers, Darren
>
>
>
>
>
> ----- Original Message -----
> From: "Lionel NACCACHE" <lionel.naccache at wanadoo.fr>
> To: <Eeglablist at sccn.ucsd.edu>
> Sent: Friday, January 17, 2003 3:45 AM
> Subject: *****SPAM***** [Eeglablist] channels location for egi 128
> electrodes net
>
>
> > Hi,
> >
> > Using EGI netstation for EEG acquisition, I'm looking for a channel
> location file (.loc or .elp ?) referencing each number coded electrode with
> its corresponding (cartesian or polar) coordinates.
> > Would someone help me to find it ?
> >
> > Cordially,
> >
> > Lionel Naccache
> >
> >
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>