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

Evans, Ian D. ievans at une.edu.au
Thu Sep 2 23:42:55 PDT 2010

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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