[Eeglablist] Oddity with ICA and Channel Power Spectra

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Jan 20 19:01:44 PST 2014


Dear Steven,

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.

Makoto


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)
>>
>> 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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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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