[Eeglablist] problem getting ICA to run properly on data files

[Emily Kappenman]

Hi all,

I have been using ICA for some time now to correct eye blink artifacts in
EEG data files with lots of success, but I just started using a new EEG
system and am running into problems getting ICA to run properly on the
files.  I am encountering the following error message: error: runica():
QUITTING - weight matrix may not be invertible!

This occurs on data files from multiple subjects, of different lengths,
with different sampling rates, with different reference sites (both online
and offline), etc..  Sometimes ICA will run but will require multiple
separate components for eye blinks (5 or 6 out of 31 components).  The
number of the components in the list that relate to the eye blinks also
seems to correspond to channel numbers in a systematic way (e.g., if FP2
was channel 30 in the data set, component 30 is one of the components,
etc.).

Has anyone encountered anything like this before or have any ideas what
might be causing this?  Any suggestions are much appreciated!

Thanks so much!
-Emily Kappenman

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Emily S. Kappenman, Ph.D.
UC Davis Center for Mind and Brain
267 Cousteau Place
Davis, CA 95618
eskappenman at ucdavis.edu
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