ideal length of epochs + Ideal number of components for ICA

I’d want to add that I still believe using only 15 components is a little bit low given that you have >100 channels (as I deducted from your other posting). For EEG I always try to use n_components equal to the rank of the data, but then again I usually work with ~64 electrode setups. But I would suggest to at least double or even quadruple the number of components you’re using (i.e., increase it to 60) and check if that changes (improves) the decomposition. Otherwise I’d be very worried to remove too much “brain signal” when rejecting a component.

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