[Eeglablist] eye movement correction

[William J. Gehring]

Binaries (DOS/Windows) and C code for the Gratton et al. eye movement
correction procedure (EMCP) are available at:

http://www.umich.edu/~wgehring/emcp2001.zip 

The file is also posted at the Neuroscan website, although their support
area is now accessible only by password.  I have not heard of EMCP being
implemented in matlab.  However, in addition to doing ICA-based ocular
artifact correction, EEGLAB also has the ability to do a regression-based
correction similar to EMCP. Electrical Geodesics also has EMCP implemented
in their system.

I recently compared ICA-based correction and EMCP on the same dataset. At
the level of average waveforms the corrected data were remarkably similar,
but I did not compare the corrected datasets in any depth (single trials,
variability, subsequent ICA analyses, etc.)  It seems that ICA should be
less likely to remove non-ocular frontal activity. I'd be interested to know
if anyone has looked at this.

Bill

William J. Gehring, Ph.D.
Department of Psychology
University of Michigan
Ann Arbor, Michigan  48109-1109  USA 
http://www.umich.edu/~wgehring
phone:  734-763-4381
FAX:  734-763-7480


> -----Original Message-----
> From: eeglablist-admin at sccn.ucsd.edu 
> [mailto:eeglablist-admin at sccn.ucsd.edu] On Behalf Of Marco Buiatti
> Sent: Wednesday, May 26, 2004 6:35 AM
> To: eeglablist at sccn.ucsd.edu
> Subject: [Eeglablist] eye movement correction
> 
> Hello,
> 
> Does anyone know where I can find an implementation of the 
> eye movement correction algorithm of Gratton et al, "A new 
> method for off-line removal of ocular artifact." (1983), 
> preferably in matlab? Also, do you know other eye movement 
> correction algorithms which are more efficient than Gratton's 
> one? (I guess people came up with something else in 21
> years..)
> 
> Thank you in advance,
> 
> Marco
> 
> --
> Marco Buiatti
> 
> Neurophysique et Physiologie du Systeme Moteur - CNRS UMR 
> 8119 UFR biomedicale Les Saints-Peres
> 45 rue des Saints-Peres 75270 Paris cedex 06
> Tel: +33(0)142862146
> Fax: +33(0)149279062
> http://www.neurophys.biomedicale.univ-paris5.fr/~buiatti/
> 
> 
> 
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