[Eeglablist] Standardisation in high resolution EEG/ERP montage

[Andrew Chen]

Dear all:

If we recall the past 10-20 system (montage/nomencleture), the extend
10/20 system, and several varieties of high-resolution systems from each
EEG vendor, we must come to agreement on a "new" IFCN standard.

Robert Oostenveld (our research associate) and P. Praamstra have
recently published such a rationale candidate for an elegant system, as
below:

" R. Oostenveld and P. Praamstra. The five percent electrode system for
high-resolution EEG and ERP measurements. Clin Neurophysiol,
112:713-719, 2001."

Based on this 10/5 High-Resolution EEG/ERP System, we have now
accomplished 3 major works, submitted to HBM-2003:
1. EEG surface coordinate system related to structural and functional
brain areas (Robert Oostenveld, Lars Arendt-Nielsen, Andrew C.N.
Chen).           
2. Cortical Plasticity and EEG: Variability of 3D Topographic Mapping in
Median-nerve Stimulation of Individuals (Andrew CN Chen, Jorgen Kold,
Robert Oosterveld, Lars Arendt-Nielsen).
3. High-resolution (128-ch) Dynamic Source-Imaging of ERPs in Man: 
Visual processing identified by an Occipital-Parietal-Prefrontal
Sequenlae in the Brain (Andrew CN Chen, Lars Arendt-Nielsen L, Frank
Zanow).

This 10/5 System proves (a) logical, (b) valid, and (c) sensitive for
defining 3D surface coordinates, local extrema, source imaging, and
structural corregistration.

If you need further information, please contact us.

Sincerely,
Andrew CN Chen, Ph.D.
Human Brain Mapping and Cortical Imaging Laboratory
Aalborg University
Denmark
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       eeglablist at sccn.ucsd.edu



Darren Weber wrote:
> 
> 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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> > >
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