[Eeglablist] Should the reference channel be included when running ICA?

[Arnaud Delorme]

Dear Steve,

you should use all channels and the default options.
Best regards,

Arno

On Sep 16, 2011, at 8:51 AM, Stephen Politzer-Ahles wrote:

> Hi everyone,
> 
> I have some data that were recorded using the left mastoid as the online reference and then were re-referenced offline to the average of both mastoids, saving a new ref channel. Thus, the data include both A1 (right mastoid) and a "REF" channel (average of both mastoids).
> 
> I would like to run ICA on these data (not to analyze the components per se, but just to remove ocular artifact). Should I remove the REF channel from the data, or use the 'pca' option in runica() to reduce the dimensions of the data (since the REF channel is not independent from the A1 channel), or just use the default options?
> 
> Best,
> Steve Politzer-Ahles
> 
> -- 
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://www.linguistics.ku.edu/
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