[Eeglablist] ICA for ERP analysis

[David Kaufman]

Dear EEGLAB list,

I'm trying to extract independent components for my ERP single trial
analysis. I'm receiving these components by filtering my raw data with a
low pass filter of 15 Hz and extracting trials with stimulus onset. The
base line of the trials is removed by using a pre-trial of 300 ms.
Non-trials are cut out before the pre-trial. All trials, i.e. non-trials
and trials are z normalized and concatenated and fed to the amica [0]
function.

The resulting components look like this:
https://dl.dropboxusercontent.com/u/2635172/AMICA.png

As you can see many components are localized around one electrode
(3,4,5,6,8,9,10,11,12, ...). Almost all of my subjects have these focused
components. Is this normal or do I have a error in my setup? Any help is
greatly appreciated.

[0] http://sccn.ucsd.edu/~jason/amica_web.html

Regards,
David
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