[Eeglablist] Re-referencing to average and retaining (Brain Vision)

[Makoto Miyakoshi]

Dear Marcin,

This magnificent paper discusses the problem you mentioned
https://urldefense.com/v3/__https://www.frontiersin.org/articles/10.3389/frsip.2023.1064138/full__;!!Mih3wA!EMaJpph4Mu03kdph6_XQBOtHDdwE7MpHICqhy2xJDPAj1V01UT4lyPDHVkAN3QHCxPkJ2PcP8kzpWzJQL_k4edh8IAU$ 

It's actually more straightforward to edit the data directly using Matlab
command line. See my solution below.
https://sccn.ucsd.edu/wiki/Makoto's_useful_EEGLAB_code#How_to_re-reference_to_average_potential_including_the_initial_reference_.2808.2F03.2F2023.29
Note that after applying this process, you perform 'eeglab redraw'. If this
process deletes the result of the process, please let me know.

Makoto

On Thu, Jul 27, 2023 at 8:37 AM Marcin Naranowicz via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear All,
>
> I have encountered a problem with re-referencing that I cannot solve after
> reding respective threads on the EEG list and consulting the EEGLAB
> tutorials.
>
> I am currently analysing EEG data collected with the Brain Vision software
> (64 channels + two EOGs, the ActiCHamp amplifier, online reference
> electrode: Fz) in EEGLAB and MATLAB through scripting. I am trying to
> re-reference the data to the average reference, retaining the online
> reference channel (Fz).
>
> I followed the instructions provided in the tutorial: imported a raw data
> file (.vhdr) and appended the missing Fz channel as well as set it as a
> reference in the Channel location editor. The main EEGLAB window now
> provides the following information : - Channels per frame: 65 (same as
> after importing the data), - Reference: Fz, - Channel locations: yes. Yet,
> when trying to re-reference the data to the average reference and select
> the reference electrode to be retained (the 'Add old reference channel back
> to the data' function), I receive the following warning message: "There are
> no reference channel defined, add it using the channel location editor."
> When I type 'Fz' manually, Matlab ignores it anyway ("Error with old
> reference: ignoring it").
>
> Do you possibly have an idea what I can do about this? I would much
> appreciate your help. Script-based solutions are also more than welcome.
>
> Kind regards,
> Marcin Naranowicz
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