[Eeglablist] Using ICA with interpolated channels

Jordi Costa Faidella jordicostafa at gmail.com
Tue Sep 28 09:15:37 PDT 2010


thank you David and Philip for your clear comments!

However, I still have a question for Robert Whelan about the FASTER method: in the paper, the method appears to perform first an interpolation of bad channels and then the ICA, constrained with PCA. Is this PCA that constrains the possible ICs implemented by default in the method or it is something you had to perform in order to be able to use FASTER with your dataset?

thank you,

Jordi 




El 28/09/2010, a las 12:03, Philip Michael Zeman escribió:

> Hello Jordi
> 
> there are a number of methods of interpolation and not all are equal. However, generally:
> 
> an interpolated channel is the linear combination of 2 or more other real EEG channels.
> 
> Hence, a new dimension of data is not being created by doing the interpolation.
> 
> Hence, the interpolated channel does not benefit the ICA process.
> 
> This said,
> 
> it is pemissible to interpolate channels of back-projected (scalp projected) components "after" applying ICA.
> 
> 
> Phil
> 
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Philip Michael Zeman B.Eng, Ph.D.
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> 
> ----- Original Message ----- From: "Jordi Costa Faidella" <jordicostafa at gmail.com>
> To: <eeglablist at sccn.ucsd.edu>
> Sent: Wednesday, September 22, 2010 5:43 PM
> Subject: [Eeglablist] Using ICA with interpolated channels
> 
> 
>> Dear EEGlab users,
>> 
>> this question arose when reading the new FASTER method, but I think is of general importance for all of us. Is it correct to perform an ICA on a dataset in which some of the channels have been interpolated?
>> 
>> thanks,
>> 
>> Jordi
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