[Eeglablist] Re-reference after ICA cleaning for BioSemi data

[Benjamin Skerritt-Davis]

Hi everyone,

I need some advice on cleaning BioSemi EEG data using ICA. I have data with
38 channels, and I would like to be able to analyze the data using
different re-reference channels after ICA cleaning (e.g., linked mastoids,
nose). My intuition is to run ICA on all 38 channels (before
re-referencing) so the data is full rank, project out any "bad" components,
then re-reference the cleaned data.  A couple of questions:

1) Given that BioSemi data is collected essentially "reference-free", is it
OK to perform ICA before re-referencing?

2) After using ICA to remove eye blink components and project back to
sensor space, can I re-reference the cleaned data directly?  Or do I need
to first re-reference the original data AND the unmixing matrix from the
ICA before removing the bad components?


I've found conflicting answers to similar questions online, so I'm hoping
for consensus this time around. =)

Thanks for the help,
-Ben
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20160107/35612fb4/attachment.html>