[Eeglablist] Interpolating bad channels while avoiding PCA before ICA

Renzo Carlo Lanfranco renzo.lanfranco at ug.uchile.cl
Mon May 20 16:37:08 PDT 2013


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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