[Eeglablist] about using the tip of nose as reference channel

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Wed Oct 29 13:43:27 PDT 2014

Dear Hui-bin,

Ok, try this: you prepare 3 (or 5 or 10) copies of the same data, but one
of them referenced with Cz, another referenced to nose tip, another
referenced to average,... and run ICA separately and compare results. They
should show exactly the same results (other than baseline values).

And, I gave you wrong reply, I apologize it; I recommend you INCLUDE EOG
channels into ICA (James, you are absolutely right and I agree with you.)
Don't remove them if you want better EOG (therefore EEG) decomposition.


On Fri, Oct 24, 2014 at 7:22 AM, James Jones-Rounds <jj324 at cornell.edu>

> Hi Hui-bin,
> I just want to add that I typically leave my HEOG and VEOG channels IN the
> data that's fed into the ICA. Leaving them in helps the ICA find the
> eye-movement related components. It seemed like Makoto was agreeing with
> you that you should remove the HEOG and VEOG channels pre-ICA.
> However, one distinction is that my EOG channels are around the outer edge
> of each eye, not on the tip of the nose, and my offline reference channels
> are the mastoid channels, which I do typically remove pre-ICA. So if you're
> worried about eye-movement contamination in your tip-of-the-nose reference
> channel, then it's probably good to remove it pre-ICA.
> Not sure if that helps at all!
> James
> --
> James Jones-Rounds
> Laboratory Manager
> Human Development EEG and Psychophysiology (HEP) Laboratory,
> Department of Human Development,
> --------------------------------------------
> Cornell University | Ithaca, NY
> 607-255-9883
> eeg at cornell.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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