[Eeglablist] Enough data points for ICA

[Yamil Vidal Dos Santos]

Hi all,
I have seen in this list that the recommended minimum data points to run
ICA is channel^2 x 30.
If I have a 128 electrode montage, and I sample at 250Hz, this would mean a
minimum of 32 minutes of recording. Is this correct? Would it make a
difference if I use PCA with ICA?

I'm asking this because in one of my experiments the entire recording lasts
about 7 minutes. I wanted to use ICA to clean this data, because the
experiment doesn't have a trial structure, but is instead a continues
exposure to a speech stream. I have run ICA on this data before and the
results looked decent.
Any recommendations?

Thanks,
Yamil
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