[Eeglablist] bad channel rejection based on spectrum (pop_rejchan, spectopo issue)
nucleuscub at gmail.com
Thu Jul 17 12:10:52 PDT 2014
We fixed the issue.
Find the updated function in the link below, and replace it into your
On Thu, Jul 17, 2014 at 10:28 AM, Ramón Martinez <nucleuscub at gmail.com>
> 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?
> 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],
>> measure2 = pop_spectopo(EEG, 1, , 'EEG' , 'freqrange', [55 65],
>> 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!
>> 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.
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