[Eeglablist] running ICA - with or without ocular channels?

[Makoto Miyakoshi]

Dear Jose,

Sorry for belated response.
I detailed my description a little bit upon your question.
https://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline#Run_ICA_.2806.2F29.2F2017_updated.29


   - Include EOG and other channels as long as they share a reference
   electrodes with scalp (exploratory) electrodes. If EOG channels are
   referenced to each other as bipolar, exclude them.


I did not understand what you mean by this

> Since to obtain EOG channels we do a subtraction the reference doesn't
matter anymore, right? It is cancelled-out. So I'm not sure what reference
Makoto is referring to,

Anyway, to confirm my point again, include EOG channels UNLESS they are
bipolar-referenced to each other.

Makoto



On Sat, Mar 11, 2017 at 1:59 AM, José Luis <joseluisulloafulgeri at gmail.com>
wrote:

> hi,
> I'm trying to run ICA, and I just looked at Makoto's preprocessing
> pipeline advising to include EOG channels as long as they are referenced
> together. This is not very clear to me. We have recorded the typical 4
> channels to generate the EOG channels. When they are loaded we reference
> all channels to Cz, and then for these channels we proceed to subtraction
> to obtain vEOG and hEOG. Before ICA we re-reference all the other channels
> to average reference (not including the EOG channels). Since to obtain EOG
> channels we do a subtraction the reference doesn't matter anymore, right?
> It is cancelled-out. So I'm not sure what reference Makoto is referring to,
>
> My question stand, if I should include or not, both of my EOG channels for
> ICA. A priori I would think that including EOG would allow us to detect
> better ocular artefacts,
>
> Thanks for you help and advice in advance,
>
> Jose
>
> --
> José Luis ULLOA FULGERI, PhD
> +32477429007 <+32%20477%2042%2090%2007>
> +32492646477
> https://sites.google.com/site/joseluisulloafulgeri/
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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