[Eeglablist] problem with data display (BDF) files

[Lei Xi]

Hello,

You may try "Remove DC offset" in "Display" menu.
Please see the attached slides.

Kind regards,

Le mar. 10 juin 2025 à 22:48, Karolina Broś via eeglablist <
eeglablist at sccn.ucsd.edu> a écrit :

> Hello,
>
> I would like to ask about a possible solution to the problem with data
> display after import.
>
> We are working with Biosemi and we are using a config file which forces a
> mastoid reference in the data online. The data is therefore already
> referenced at the moment of import.
>
> However, when importing the BDF file, we cannot visualise the data
> correctly. EEGlab reads 40 electrodes correctly but only seems to be
> displaying 4. Rereferencing and adding channel locations does not help.
>
> THis is how it looks:
>
>
> https://urldefense.com/v3/__https://drive.google.com/file/d/1GrMh4RkbkJlMpnFBPGH8wtOsj3391WTD/view?usp=drive_link__;!!Mih3wA!FY249GOG7pHw7iWnAvnrqf2wPm2uyy5gW7bDYMSSAW760jdP_0kIEJHkhcN6UavuGOuRG9KZZ8A0UJl-0qo6qvs$
>
> Interestingly, once we play around with the values in the window and zoom
> out, we see that all the electrode data are there, as on the screenshot
> below, but they are not displayed linked to the right electrode names and
> cannot be manipulated, scrolled etc. in any reliable manner.
>
> Obviously, this makes it difficult to make any subsequent preprocessing
> because we cannot visualise ICA nor reject epochs, etc.
>
>
> https://urldefense.com/v3/__https://drive.google.com/file/d/1zgcnQ2MoFokrFrA41DR5lBxAx7c51Kpp/view?usp=drive_link__;!!Mih3wA!FY249GOG7pHw7iWnAvnrqf2wPm2uyy5gW7bDYMSSAW760jdP_0kIEJHkhcN6UavuGOuRG9KZZ8A0UJl-VPX_JO0$
>
>
> The data can be displayed correctly in BrainVision Analyzer (checked by a
> colleague with a license). We also managed to see the data correctly from
> all electrodes using a Python script.
>
> We believe this problem may be due to the config file and online
> referencing.
>
> Is it possible to overcome this problem somehow or check whether the data
> is fine in a different way?
>
> I would appreciate any help on the matter.
>
> This is the link to the config file:
>
> https://urldefense.com/v3/__https://drive.google.com/file/d/1TqWN9et3z3_u9dg59ws53anqu92f_-y3/view?usp=drive_link__;!!Mih3wA!FY249GOG7pHw7iWnAvnrqf2wPm2uyy5gW7bDYMSSAW760jdP_0kIEJHkhcN6UavuGOuRG9KZZ8A0UJl-HRaQ52A$
>
>
> Pozdrawiam serdecznie  |  Kind regards,
>
> dr hab. Karolina Broś
>
> Head of Language Science and Technology MA programme
> Institute of Applied Linguistics
> Neurolinguistics Lab
> Multilingual Research Hub
> University of Warsaw
> ul. Dobra 55
> 00-312 Warszawa
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-- 
*Lei XI*