[Eeglablist] Problems with the whiteness of the residuals

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Mar 24 17:17:25 PDT 2014


Dear Bethel and John,

I also often encounter this problem. It seems there is no guaranteed
solution for this. I almost always use order == 30 with piecewise
detrending on. Maybe you want to decrease the ICs to include (which could
be against your experimental interest, I know...)

Should we contact Tim?

Makoto




2014-03-19 15:35 GMT-07:00 Bethel Osuagwu <b.osuagwu.1 at research.gla.ac.uk>:

> Hi
> What model order and window size are you using? You might need to give
> more details about your pre-processing steps including whether you are
> working with IC or sensors and the use of spatial filters. If your model
> order is too low for a given window size then your data will not be modeled
> properly and the residuals will not be white. So you might try using higher
> model orders but without over fitting.
>
> Bethel
> ________________________________________
> From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu]
> On Behalf Of jfochoaster . [jfochoaster at gmail.com]
> Sent: 18 March 2014 03:30
> To: eeglablist
> Subject: [Eeglablist] Problems with the whiteness of the residuals
>
> eeglab experts,
>
> I am working with ECoG data in eeglab using the SIFT plugin. When I am
> validating the model I obtain good consistency, above the 90%, good model
> stabilty, 100% stable, but bad whiteness of the residuals, none of the
> windows are white
>
> What I can do with these results?
>
> My data are adquired with the subject in resting, 240 Hz of sampling
> frequency, 16 channels, around 80 epochs of 2 seconds
>
> I really appreciate any help you can provide
>
> Best,
> --
> John Ochoa
> Docente de Bioingeniería
> Universidad de Antioquia
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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