[Eeglablist] Oddity with ICA and Channel Power Spectra

berry van den berg berryv.dberg at gmail.com
Thu Jan 16 15:49:26 PST 2014

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 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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