[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)

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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