[Eeglablist] Interpolating bad channels while avoiding PCA before ICA

[Renzo Carlo Lanfranco]

Mikolaj, what if you run the ICA without including the bad channels? You
can interpolate the bad channels after removing the bad components
resulting from the ICA.
Renzo


2013/5/20 Mikołaj Magnuski <imponderabilion at gmail.com>

> Oops, I forgot to mention that I am planning to remove bad channels before
> ICA.
> 20 maj 2013 01:11, "Mikołaj Magnuski" <imponderabilion at gmail.com>
> napisał(a):
>
>> 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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