[Eeglablist] Averaging EEG files with diff channel numbers

[Heloise M De Baun]

Thank you!

On Wed, Jan 12, 2022 at 8:19 PM Makoto Miyakoshi via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear Ellee,
>
> Unfortunately, EEGLAB does not support that operation.
> Using Matlab command line, you can do it as follows. Assuming the data are
> already epoched to the same length and data dimensions are ch x time x
> epochs,
>
> concantenated_data = cat(3, old_data, new_data(1:64, :, :));
>
> Note that I'm using only the first 64 channels for the new data. Thus the
> old and new data epochs are concatenated.
> Then take an average across epochs,
>
> erp = mean(concatenated_data, 3);
>
> This 'erp' has 64 channels and average potentials.
>
> Makoto
>
> On Wed, Jan 5, 2022 at 8:15 AM Heloise M De Baun via eeglablist <
> eeglablist at sccn.ucsd.edu> wrote:
>
> > Hi,
> >
> > We are now recording with 64 eeg channels and then 3 extra auxiliary
> > channels that have eyetracking information (1 channel for eye
> x-position, 1
> > for y-position, 1 for pupil size). We want to average these eeg files (or
> > eventual erp files) with our old eeg files that were recorded with only
> 64
> > channels.
> >
> > To be clearer, we want to average an eeg file with 67 channels (64 EEG
> > channels + 3 aux) with an eeg file with 64 channels (all EEG). Is this
> > possible without deleting channels from the 67 channel file?
> >
> > Best,
> > Ellee
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