[Eeglablist] channels location for egi 128 electrodes net

[Mike Hartman]

Darren,

Here is a list of approximate 10-20 equivalents. EGI electrode number in
left column, 10-20 electrode label in right column.

Vref	CZ
11	FZ
14	Fp2
22	Fp1
25	F3
34	F7
37	C3
46	T7
53	P3
59	P7
62	PZ
72	O1
77	O2
87	P4
92	P8
105	C4
109	T8
122	F8
124	F4

The method for obtaining the equivalence table and the complete 10-10
correspondence for EGI's 64-, 128-, and 256-channel Nets can be found
in:

ftp://ftp.egi.com/pub/documentation/technotes/ElectrodePositions.pdf

The sensor layouts in this document are a bit fuzzy. Anyone who wants
better ones, or more information, is encouraged to contact me at
support at egi.com.

Thanks for raising this issue, it is an important one.


Michael Hartman
Support Engineer
Electrical Geodesics, INC.
www.egi.com


-----Original Message-----
From: eeglablist-admin at sccn.ucsd.edu
[mailto:eeglablist-admin at sccn.ucsd.edu] On Behalf Of Darren Weber
Sent: Friday, January 17, 2003 3:41 PM
To: Eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] channels location for egi 128 electrodes net


Hmmmm, doesn't this raise issues for publication?  If new electrode
systems
do not conform to previous works and published standards, how do we
compare
across studies?  Is there a new standard and where is it documented?
Surely, for publication purposes, at least, the new electrode locations
need
to be equated with the 10/20 system?

Darren


----- Original Message -----
From: "Morgan Hough" <mhough at radiology.ucsf.edu>
To: <Eeglablist at sccn.ucsd.edu>
Sent: Saturday, January 18, 2003 4:36 AM
Subject: Re: [Eeglablist] channels location for egi 128 electrodes net


> 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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eeglablist-unsub at sccn.ucsd.edu
> > >
> >
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