[Eeglablist] Applying ICA weights from 1Hz filtered data to 0.1Hz filtered data

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Fri Aug 21 16:43:24 PDT 2015


Dear Neil,

I saw your code. I don't know what's wrong with it.
Maybe after copying the ICA matrices, you want to try

EEG = eeg_checkset(EEG, 'ica')'

to let EEGLAB re-calculate ICA activations etc. I'm not sure though if it
will solve the problem.

Makoto

On Wed, Aug 19, 2015 at 8:29 PM, Neil Bailey <neil.bailey at monash.edu> wrote:

> Hi all
>
> I'm having trouble applying my ICA weights from 1Hz filtered data to my
> 0.1Hz filtered data.
>
> I've been trying to use a script adapted from a previous post by Stefan
> Debener to take the ICA weights out of the 1Hz data and put them into the
> 0.1Hz data. The script is effective for transfering the ICA weights (they
> show up in the EEG.ica... sections of the 0.1Hz dataset), but when I plot
> the 0.1Hz dataset the components that I removed are still in the trace (ie.
> eye blinks remain in the trace). An example section of the script I'm using
> is listed below.
>
> I'm applying the ICAs to epoched data rather than continuous data, but I
> can't see that that would be the problem. Am I missing a required step?
> Like perhaps removing the artifact components?
>
> Load 1Hz filtered data set after ICA has been conducted and bad components
> have been removed, then:
>
> >>* TMP.icawinv = EEG.icawinv;
> *>>* TMP.icasphere = EEG.icasphere;
> *>>* TMP.icaweights = EEG.icaweights;
> *>>* TMP.icachansind = EEG.icachansind;
> *>>>>* % apply to epoched dataset
> *>>* clear EEG;
> *>>* EEG = pop_loadset('filename', [SUBJ{s}, '_bcgrem.set'], 'filepath', PATHIN);
> *>>* EEG.icawinv = TMP.icawinv;
> *>>* EEG.icasphere = TMP.icasphere;
> *>>* EEG.icaweights = TMP.icaweights;
> *>>* EEG.icachansind = TMP.icachansind;
> *>>* clear TMP;
> *>>* EEG = pop_saveset(EEG, 'filename',[SUBJ{s}, '_epoched.set'],
> *>>* 'filepath',PATHOUT);
> *>>* [ALLEEG, EEG, CURRENTSET] = eeg_store(ALLEEG, EEG, 0);
> *>>>>* end
> *>>* eeglab redraw;*
>
> Kind regards,
>
> --
> Neil Bailey (PhD)
> Monash Alfred Psychiatry Research Centre
> Neil.Bailey at Monash.edu
> (03) 9076 5032
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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