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

[Makoto Miyakoshi]

Dear Chao,

> So, I just wonder how it assures the same correspondence across the 2
datasets when simply copying ICA weights from one to another.

That's a legitimate question!
'Copying ICA weight' we often say actually means copying EEG.icaweights,
EEG.icachansind, and EEG.icasphere, as you can find these items when you
'copy ICA weights' from GUI ('Edit' -> 'Dataset info', bottom in the
window.)

Makoto

On Fri, Aug 21, 2015 at 9:50 PM, chao wang <hnchaowang at gmail.com> wrote:

> Hi, I am new in ICA and have a question related to this issue. Each column
> of ICA weight matrix is corresponding to a specific ICA component, but the
> sequences of components resulting from two different ICA processes (e.g.
> ica of 1 Hz and 0.01 Hz filtered datasets) might be very different. So, I
> just wonder how it assures the same correspondence across the 2 datasets
> when simply copying ICA weights from one to another.
>
> Thanks,
> Chao
>
>
> On Sat, Aug 22, 2015 at 7:43 AM, <eeglablist-request at sccn.ucsd.edu> wrote:
>
>>
>> ---------- Forwarded message ----------
>> From: Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
>> To: Neil Bailey <neil.bailey at monash.edu>
>> Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
>> Date: Fri, 21 Aug 2015 16:43:24 -0700
>> Subject: Re: [Eeglablist] Applying ICA weights from 1Hz filtered data to
>> 0.1Hz filtered data
>> 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
>>>
>>> _______________________________________________
>>> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>>> To unsubscribe, send an empty email to
>>> eeglablist-unsubscribe at sccn.ucsd.edu
>>> For digest mode, send an email with the subject "set digest mime" to
>>> eeglablist-request at sccn.ucsd.edu
>>>
>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>> _______________________________________________
>> eeglablist mailing list eeglablist at sccn.ucsd.edu
>> Eeglablist page: http://www.sccn.ucsd.edu/eeglab/eeglabmail.html
>> To unsubscribe, send an empty email to eeglablist-unsub at sccn.ucsd.edu
>> To switch to non-digest mode, send an empty email to
>> eeglablist-nodigest at sccn.ucsd.edu
>>
>
>
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>



-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20150902/95a886d1/attachment.html>