[Eeglablist] More than EEG channels in EEG structure, how can I add the channel locations information?

[Makoto Miyakoshi]

Hi Martin,

I do not know much about EEGLAB's business on how to maintain consistency
of data structure internally.
Ater signal processing, I usually separate non-body-attached-electrode
channels to EEG.etc manually so that ICA and dipfit can process all the
input channels. This is the safest way to go.
For example, I would include all ECG and EOG channels for ICA regardless of
availability of their location information. I do not see any problem doing
it. If you can't do it, something must be wrong with your input data
structure.

I do not know how elegantly dipole fitting functions handle non-EEG
channels. But under presence of ECG channels with no location information,
I thought dipfit still worked. But I could be wrong.

Makoto

On Wed, Jul 10, 2024 at 7:15 PM Martin Simoneau via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear EEGlab users,
>
> I record external analog signals (i.e., EMG and accelerometer signals)
> with the EEG signals (65-channels). When I try to add the channel
> locations, I get this warning:
>
> The number of data channels (65) not including the fiducials does not
> correspond to the initial number of channels (77), so for consistency
> purposes new channel information will be ignored if this function was from
> EEGLAB. If you have added a reference channel manually, check the "Data
> channel" checkbox is off.
>
> How can I add the channel location when the dataset contains other channel
> than EEG channels?
>
> If I succeed with adding the channel locations information, will dipole
> fitting work thereafter?
>
> Does anyone know how to manage this?
>
> Your help will be appreciated!
>
> Regards,
>
> Martin
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