[Mne_analysis] specify noise covariance rank in MNE-Python?

Denis A. Engemann denis.engemann at gmail.com
Thu Dec 11 07:03:46 EST 2014
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Hi Martin to me this makes absolutely sense. This is also related to PR #1671 on MNE-Python. Likewise, we could have a rank parameter for spatial whitening.

+1 for taking into account the rank (due to sss | proj | ica)

> On 11 Dec 2014, at 12:47, Martin Luessi <mluessi at nmr.mgh.harvard.edu> wrote:
> 
> Hi,
> 
> The mne_inverse_operator command has an option to specify the rank of
> the covariance matrix. This is useful when e.g. maxfilter has been
> applied to the data and the rank has been reduced. It seems like this
> option is currently missing from MNE-Python; we are computing an inverse
> operator using a covariance matrix estimated from data with maxfilter
> applied but the detected rank is 200  (only gradiometers) instead of 64.
> 
> Is there a reason for not having this option in MNE-Python or would it
> make sense to add it?
> 
> Best,
> 
> Martin
> 
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