[Eeglablist] Interpolating bad channels while avoiding PCA before ICA

[Simon-Shlomo Poil]

Dear Mikolaj,

You can run ICA only on your good channels. Just use the 'chanind' in
pop_runica.

To make it easier you could also use the NBT toolbox
(http://www.nbtwiki.net) (plugin for EEGLAB), and simply using the
Pre-processing|ICA|Run ICA on good channels only menu (given that you
also use NBT's functions to remove bad channels).

Best wishes,
Simon

--
Simon-Shlomo Poil, Dr.

2013/5/20 Mikołaj Magnuski <imponderabilion at gmail.com>:
> Dear EEGLab community,
>
> Given that PCA is not recommended before ICA,
> how to avoid it while still interpolating bad channels?
>
> My initial analysis of the data is in channel space
> so I would like to have all channels for all participants.
> Therefore I want to interpolate bad channels (I have a
> maximum of 4 bad channels out of 64 per subject).
> This causes the rank of the data to decrease and compli-
> cates using ICA for artifactual components removal.
>
> Do you think a following way of avoiding PCA before ICA is ok?
> 1. preprocess the data before ICA
> 2. perform ICA and remove artifactual components
> 3. interpolate channels
>
> So, in short: is it valid to interpolate channels only after
> removal of artifactual ICs?
>
> Mikolaj M
>
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