[Eeglablist] Re-referenceing

[Makoto Miyakoshi]

Dear Salim,

Sorry for slow response.

> I am wondering if re-reference the data prior to ICA would affect the
components phases and their iCoh?

In short, no. I've heard of that kind of skepticism in this list a few
times and I also read the related paper, but my conclusion is that the
criticism is invalid.

> Should I use average re-reference or keep the data as it is and run ICA?

For ICA it does not matter. If you want to avoid all-red/blue scalp topos
due to DC, I recommend you run average reference before ICA. See my memo
below.
http://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline

Makoto

On Sun, Jan 11, 2015 at 12:31 PM, Salim Al-wasity <salim_alwasity at yahoo.com>
wrote:

> Dears
> Have a nice day.
> Kindly I am wondering if re-reference the data prior to ICA would affect
> the components phases and their iCoh?
> Should I use average re-reference or keep the data as it is and run ICA?
>
> Sincerely
> Salim
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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