[Eeglablist] Oddity with ICA and Channel Power Spectra

[Steven Pillen]

It looks like you were completely right on that point.  Is there any way to
modify the percentage for an EEGLAB study's spectral plots?  It seems it
must be some percentage smaller than 100, because I get the exact same
problem of the spectra looking different before and after ICA.


On Thu, Jan 16, 2014 at 3:49 PM, berry van den berg
<berryv.dberg at gmail.com>wrote:

> Hi Steven,
>
> Just a guess:
> EEGLAB samples parts of the data to compute the spectra. Did you use 100%
> of the data or just parts of the data? (the option percent data to sample)
>
> Cheers,
>
> Berry
>
>
> On 15 January 2014 20:43, Steven Pillen <stevendpillen at gmail.com> wrote:
>
>> Hello, EEGLAB list.
>>
>> I seem to be observing a change in the power spectra after running ICA on
>> some data files.  Note the difference between these two images, which are
>> from before and after ICA was run.  No other processing was done on these:
>>
>> Before:
>> http://imgur.com/spMyRfr
>>
>>
>> After:
>> http://imgur.com/jwqgBcK
>>
>> Does anyone know what could possibly account for this?
>>
>> Thank you,
>> Steven Pillen
>>
>> _______________________________________________
>> 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
>>
>
>
>
> --
> Berry van den Berg
> berryv.dberg at gmail.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20140117/fefa7735/attachment.html>