[Eeglablist] Reproducible ICA

[Frühlinger, Christoph]

Dear Ivano,

thank you for your advice. I have already tried that position and I keep getting different ICA results.

Best
Christoph

Von: ivano triggiani <ivanotriggiani at gmail.com>
Gesendet: Mittwoch, 2. Juli 2025 01:51
An: Frühlinger, Christoph <christoph.fruehlinger at uni-hamburg.de>
Cc: eeglab list <eeglablist at sccn.ucsd.edu>
Betreff: Re: [Eeglablist] Reproducible ICA

Hi,

Try something like this:
rng(42); % Set seed before ICA
EEG = pop_runica(EEG, 'extended', 1);

Ivano
---

Antonio Ivano Triggiani, Ph.D.

________________________________________________

On Mon, Jun 30, 2025, 3:57 PM Frühlinger, Christoph via eeglablist <eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>> wrote:
Dear all,

I want to insert a random seed in my preprocessing script before the ICA to get reproducible results. I have tried several settings of the random seed at different locations in the script (at the top, right before the ICA, at the top of the pop_runica() function) as suggested in previous threads of the mailing list. However, I keep getting different ICA results for the same dataset. Some (potentially) relevant notes regarding the script: I use a parfor loop to call the actual preprocessing function like:

```
parfor i_Sub = 1:length(Files)
                run_preproc()
end

function run_preproc()
                # basic preprocessing

                EEG = pop_runica(EEG, 'icatype', 'runica', 'pca', rank, 'extended', 1, 'interupt', 'off');

                # some more preprocessing
end
```

I would appreciate it if you could help me!

Best wishes
Christoph
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