[Eeglablist] Oddity with ICA and Channel Power Spectra

Steven Pillen stevendpillen at gmail.com
Fri Jan 17 11:49:02 PST 2014


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
>>
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>
>
>
> --
> Berry van den Berg
> berryv.dberg at gmail.com
>
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