[Eeglablist] Eye movement artifact in ICA - missing coordinates for EOG electrodes

Baris Demiral demiral.007 at googlemail.com
Sun Sep 5 03:08:02 PDT 2010

Hi Ian,

I also made a similar query few months ago. I use 64 electrode 10-20 system
plus 4 EOGs. I asked whether there are specific labels for such EOG
electrodes in the standard-10-5-Cap385.sfp so that I can map these
electrodes on the fly. Are there labels for those, or can we decide and add
those labels and coordinates as a community together?

Actually, I find something more important: How much really does this
influence ICA related artifact detection and correction? Is there a huge
change when you include horizontal and vertical EOGs in the ICA based ERP
calculations? Are there others over there who compared  ICA based
computations with and without including the EOG electrodes?


On Fri, Sep 3, 2010 at 7:42 AM, Evans, Ian D. <ievans at une.edu.au> wrote:

> Greetings all! I'm trying to isolate eye movement artifact with ICA in an
> attempt to make EOG correction more accurate and hopefully remove less of
> the genuine underlying data that regression methods might otherwise remove,
> however I am having trouble tracking down a satisfactory scalp map that
> includes co-ordinates (Cartesian, 2D polar, 3D cylindrical) for the EOG
> electrodes on the face. Neither Neuroscan nor any setup or .loc files in
> EEGLab seem to provide these details, and all attempts to isolate eye
> movement in ICA without the location of the eye movement electrodes have
> been met with mocking laughter.
> The recordings have already been made on a 64-channel cap with six EOG
> electrodes (one above and below each eye, another beside each eye for
> horizontal eye movement) using the traditional 10-20 system. All
> co-ordinates for the scalp are already at hand, just the facial electrodes
> are needed. If anyone can make such a coordinate map available it would be
> most helpful, thank you kindly!
> Ian Evans
> Cognitive and Affective Neuroscience
> University of New England.
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SB Demiral, PhD.
Department of Psychology
7 George Square
The University of Edinburgh
Edinburgh, EH8 9JZ
Phone: +44 (0131) 6503063
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