[Eeglablist] While re-referencing data to average reference, why include/ exclude EOG channels?

[Tarik S Bel-Bahar]

Hello Akshay, not sure if you have received a response about your query.
brief notes below:

You rereferencing scheme should  include only electrodes catching brain
signal, and not EOG.
Include the EOG only if you have a good clear reason for doing so based on
high-quality published ICA-EEG articles.
Note also that it is usual to not interpolate before average referencing,
and to not interpolate before ICA.



On Tue, Oct 23, 2018 at 3:24 AM Akshay Kumar <akshayksharma94 at live.com>
wrote:

> Hi,
>
>
> This question has been discussed previously as well at:
>
> https://sccn.ucsd.edu/pipermail/eeglablist/2012/004650.html
>
> however, no concrete conclusion has been made.
>
>
> This is my EEG processing pipeline:
>
>
>    1. Do downsampling, bad channel rejection and interpolation
>    2. Re-reference data to average
>    3. Create -1000 to 2000 ms epochs and remove baseline
>    4. Reject outliers based on the absolute amplitude and variance
>    5. Use ICA to remove eye and muscle artifacts
>
>
> No research paper, explicitly mention that in their pipeline if they
> included EOG channels while average referencing or not.
> In my opinion, if I include EOG channels while average referencing,
> eye movement, saccades artifacts along with other EOG electrode movement
> artifacts will be introduced in all channels including the occipital
> channel. ICA may or may not be able to remove them.
> If I exclude EOG channels while average referencing, EEG and EOG channels
> will be left with different referencing that itself is bad for ICA.
>
> Please advise if and why include/ exclude EOG channels while average
> referencing.
>
> Thanks,
> Akshay Kumar
>
>
> [Eeglablist] Should Average Reference Include Eye Channels?
> <https://sccn.ucsd.edu/pipermail/eeglablist/2012/004650.html>
> sccn.ucsd.edu
> Thank you very much Joe. I've copied and pasted critical sentences from
> your message to organize my response. "I definitely wouldn't drop the EOG
> channels until after you've dealt with the EOG artifacts in whatever
> manner."
>
>
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