[Eeglablist] independent components (artifacts) from data

[Sameer Walawalkar]

Hello,

I am interested in using EEGLab in order to identify ICs from artefacts 
(blinks, heart) and then subtracting these independent components from 
the data.

The information on 
http://www.sccn.ucsd.edu/~scott/tutorial/icatutorial3.html 
is very useful for identifying artefacts and finding the projections of 
each IC on every channel. However, the projections seem to have a +/- sign 
ambuguity and a straighforward subtraction removes artifacts from some 
channels but enhances them in others. (Adding instead of subtracting gives 
the opposite assymetric effect).

Is there a way to get around this? I have data from 306 channels, and I am 
not very interested checking channel by channel for each artifact.

thanks,
sameer