[Eeglablist] Rejecting/Interpolating bad channels, take 2

[Fernando Ferreira-Santos]

Dear Stephanie,

You can remove and interpolate channel manually with the code below:

% Create a vector with the indices of the channels you want to remove/interpolate
badchannels = [1 2 3];
% Remove channels
EEG = pop_select( EEG, 'nochannel', badchannels);
% Interpolate channels
EEG = eeg_interp(EEG, badchannels);

Best wishes,
Fernando Ferreira-Santos


> Dear EEGLAB users,
>
> I have a few questions regarding the rejection and interpolation of bad EEG
> channels. I'm having a similar issue to that of Andrew Hill posted on May
> 9th, 2011, in that I have a few extremely bad channels that survive the
> automatic channel rejection function, regardless of the threshold/method
> applied.
>
> Please see this image for an illustration:
> http://ccp.uchicago.edu/~sechols/BadChannel_ERP.bmp
> The rejected channels are highlighted in red, but channel 55, which is
> almost comically bad, is not rejected.
>
> I have tried to use the methods recommended in the thread of Andrew Hill et
> al.,, and none of them seem to "catch" this bad channel.
>
> It also doesn't appear to matter whether the data is epoched or not.
>
> Does anyone have any recommendations?
>
> Further, does anyone know if there is a way to reject these channels using
> code (as opposed to the Edit - Select Data function in the GUI), and
> interpolate them? Is there a way to do this in concert with the automatic
> channel rejection function, and save the bad channels rejected using both
> methods in one function?
>
> Thank you all for your time, I am new at this and would appreciate any
> advice you can offer!
>
> Best,
> Stephanie
>


-- 
Fernando Ferreira-Santos

Laboratory of Neuropsychophysiology
Faculty of Psychology and Education Sciences
University of Porto
Rua Dr. Manuel Pereira da Silva
4200-392 Porto (Portugal)
Tel. +351 226079700 (ext. 301)
Site: http://www.fpce.up.pt/labpsi/
Email: frsantos at fpce.up.pt


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