[Eeglablist] bad channel rejection based on spectrum (pop_rejchan, spectopo issue)

[Ramón Martinez]

Hi Jerry,
 Thanks for reporting this issue, yep.. you are right.  We are working to
fix this now. Would you mind to move this to Bugzilla?
 Thanks,
 Ramon


On Wed, Jul 16, 2014 at 12:56 PM, Jerry Zhu <jerryzhu at siu.edu> wrote:

> Dear all,
> Since version 12, EEGLAB has a new method of bad channel rejection based
> on spectrum. We found it is very cool! However, during the process, I found
> the frequency range seems irrelevant. Not sure whether it is a bug or
> something else.
>
> Here is what I did (in EEGLAB v13.3.2):
> Tools-->Automatic channel rejection-->Measure to use: spectrum-->check the
> normalization off-->absolute threshold -50 50
> The frequency range is the tricky part: I can leave it empty (by default
> it uses [1 EEG.srate/2]), or put [1 55], or [55 65]. They all give me the
> same calculated measures. Critically I check the code of pop_rejchan:
>
> measure1 = pop_spectopo(EEG, 1, [], 'EEG' , 'freqrange', [1 125],
> 'plot','off');
> measure2 = pop_spectopo(EEG, 1, [], 'EEG' , 'freqrange', [55 65],
> 'plot','off');
>
> Run them and check with isequal(measure1, measure2). They are the same!
>
> As far as I know, if I use different freqrange, the result should be
> different with my dataset.
>
> Maybe some other users can confirm this. Thanks for your help!
>
> Cheers,
> Jerry
>
> --
> Jian Zhu, M.A.
> Brain and Cognitive Sciences
> Department of Psychology
> Southern Illinois University Carbondale
> Web: http://zhupsy.com
>
> We have two halves in the brain: left and right. Nothing is right in the
> left. Nothing is left in the right.
>
> _______________________________________________
> 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20140717/94ce2fe9/attachment.html>