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

[Ramón Martinez]

Dear Jerry,
 We fixed the issue.
Find the updated function in the link below, and replace it into your
system:

https://sccn.ucsd.edu/svn/software/eeglab/functions/popfunc/pop_rejchan.m

Regards,
 Ramon


On Thu, Jul 17, 2014 at 10:28 AM, Ramón Martinez <nucleuscub at gmail.com>
wrote:

> 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/20140717/4cce24c8/attachment.html>