[Eeglablist] Oddity with ICA and Channel Power Spectra
mmiyakoshi at ucsd.edu
Mon Jan 20 19:01:44 PST 2014
Yes Berry's guess was a super shot.
So are you running it from GUI? If so you can see '20' in the box which
means that you are using randomly selected 20% of your data.
2014/1/17 Steven Pillen <stevendpillen at gmail.com>
> 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)
>> 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
>>> 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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Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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