Hi Irene,
The ‘chanid’ parameter in the “pop_runica” function is used to specify the channels on which you want to run the ICA. The ‘chanid’ parameter should be a vector of channel indices, not the actual EEG data. So, if you want to run ICA on the first 21 channels, you should pass a vector from 1 to 21 to ‘chanid’.
Here is how you can modify your code:
%% 2. Run ICA
[EEG, ALLEEG, CURRENTSET] = eeg_retrieve(ALLEEG, 1);
EEG = eeg_checkset(EEG);
EEG.eegrank = EEG.nbchan - size(EEG.etc.noiseDetection.interpolatedChannelNumbers, 2) - 2;
% Specify the channel indices for EEG channels only (1 to 21)
chanidx = 1:21;
% Run ICA on the specified EEG channels
EEG = pop_runica(EEG, 'icatype', 'runica', 'extended', 1, 'interrupt', 'on', 'chanind', chanidx, 'pca', EEG.eegrank);
[ALLEEG, EEG] = eeg_store(ALLEEG, EEG, CURRENTSET);
Please note that I have corrected 'chanid' to 'chanind', which is the appropriate argument for specifying channel indices in the “pop_runica” function.
To learn more about “pop_runica” usage and syntax, you may refer to the link below: -
I hope this helps!
