[Mne_analysis] plotting whitened raw data

[Matti Hamalainen]

If you instead of the usual MNE whitening

y’ = lambda^(-1)U^t y

do 

y’’ = U lambda^(-1)U^t y

the y’’ data have their original spatial meaning and the values are SNRs or “z scores”.  Since the whitened data are sphered, they can be rotated in any way. Maybe there is even another more interesting rotation than U.

- Matti



> On Jan 14, 2017, at 9:54 AM, Denis-Alexander Engemann <denis.engemann at gmail.com> wrote:
> 
> Would be interesting to think for a second what would be the normative prediction in that case (what should be in which value range after proper whitening) since what is a signal and what is noise is less obvious then, also potential implications for the power spectrum (could that possibly be used to summarize the data for visualization?). 
> 
> Denis
> 
> On Sat, Jan 14, 2017 at 8:46 AM Alexandre Gramfort <alexandre.gramfort at telecom-paristech.fr <mailto:alexandre.gramfort at telecom-paristech.fr>> wrote:
> hi Olaf,
> 
> no there is no such function but it could be added.
> 
> Alex
> 
> 
> On Fri, Jan 13, 2017 at 5:35 PM, Olaf Hauk <Olaf.Hauk at mrc-cbu.cam.ac.uk <mailto:Olaf.Hauk at mrc-cbu.cam.ac.uk>> wrote:
> > Hi,
> >
> >
> >
> > is there an equivalent of evoked.plot_white() for raw data? I would like to
> > compare different covariance methods for whitening empty room data.
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Olaf
> >
> >
> >
> >
> >
> > Olaf Hauk, PhD
> >
> > MRC Cognition and Brain Sciences Unit
> >
> > Phone: +44(0)1223 273702 <tel:+44%201223%20273702>
> >
> > Fax: +44(0)1223 359062 <tel:+44%201223%20359062>
> >
> > Web: http://www.mrc-cbu.cam.ac.uk/people/olaf.hauk/ <http://www.mrc-cbu.cam.ac.uk/people/olaf.hauk/>
> >
> >
> >
> >
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