[Eeglablist] Re-referencing problem

[ivano triggiani]

Hello,

the reference online is lost, because your channels F3, P1, etc. are
actually F3-Ref, P1-Ref, etc. So, if your reference is a real channel, that
recording is lost because that channel would be Ref-Ref = 0.
For the interpolation EEGlab has a strange feature: you can only
interpolate a channel within a database (already in memory!). For some
strange reason - to my knowledge - you cannot interpolate a non-existing
channel, even providing the coordinates. Please correct me if I am wrong.

Ivano


---

*Antonio Ivano Triggiani*

Research Scientist [C]

Neurophysiology of Epilepsy Unit,

National Institute of Neurological Disorders and Stroke

National Institutes of Health

10 Center Drive, Building 10, Room 7D42

Bethesda, MD 20892-1428

Phone: (301) 402-2983
________________________________________________



On Wed, Jun 21, 2023 at 9:36 PM K Jeffrey Eriksen via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> I have experienced the same problem.
> -Jeff Eriksen
>
> -----Original Message-----
> From: eeglablist <eeglablist-bounces at sccn.ucsd.edu> On Behalf Of
> Francesca Fusina via eeglablist
> Sent: Wednesday, June 21, 2023 12:44 AM
> To: eeglablist at sccn.ucsd.edu
> Subject: [Eeglablist] Re-referencing problem
>
> Hi,
>
> I'm currently using the latest version of eeglab and I'm having trouble
> adding Cz back to my dataset. I manually set it as the reference electrode,
> complete with coordinates, as suggested by the eeglab tutorial. However,
> while the program correctly states Cz as a reference, when I try to compute
> the average reference and add Cz back to the data, I get a warning saying
> that no reference channel was found and that I should add it with the
> channel locations editor.
> Also, my interface is not the same as the one I find on the tutorial: I
> have no "Add current reference back" but "Add OLD reference back":
>
> [image: Screenshot 2023-06-21 at 09.40.31.png]
>
> When I click on Add old ref. channel, I just get the warning, with no
> channels to select.
>
> This is the screenshot that shows the reference correctly set to Cz:
>
> [image: Screenshot 2023-06-21 at 09.40.20.png]
>
> Is there a workaround for this? I also tried to interpolate Cz, but it
> simply won't show up, so I can't reconstruct it that way either.
> Any help would be greatly appreciated.
> Thanks!
>
> Francesca
>
> --
> Francesca Fusina, Ph.D.
> Post-Doctoral Research Fellow
>
> Dipartimento di Psicologia Generale, Università degli Studi di Padova
>
> Office n. 040
> ORCID:
> https://urldefense.com/v3/__https://orcid.org/0000-0002-4418-2673__;!!Mih3wA!EQ4JB6IXXtPJr2t5wO70M8Kh4a6EK9sEDI5kc4OSZlM2CRgpf3CYRoyp1UHitzm62gbjFz_DFeQ-nc6G8dUa1OsE0XOJMO0K0Q$
> <
> https://urldefense.com/v3/__https://orcid.org/0000-0002-4418-2673__;!!Mih3wA!EQ4JB6IXXtPJr2t5wO70M8Kh4a6EK9sEDI5kc4OSZlM2CRgpf3CYRoyp1UHitzm62gbjFz_DFeQ-nc6G8dUa1OsE0XOJMO0K0Q$
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