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

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Wed Apr 16 11:10:56 PDT 2014


Dear Emily,

I can think of multiple reasons, such as severe rank reduction, huge
artifacts, continuous zeros, etc etc... to diagnose it I need to ask you to
send me a sample data to reproduce the problem. Are you willing to do it?

Makoto


2014-04-09 16:17 GMT-07:00 Emily Kappenman <eskappenman at ucdavis.edu>:

> 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
>
> --
> --------------------------------------------------------------------
> 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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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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