[Mne_analysis] ICA fit on raw data with projections

[Alexandre Gramfort]

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hi Dip,

you have a discussion in the notes section of ICA doc:

https://mne.tools/stable/generated/mne.preprocessing.ICA.html

does it answer your question?

Alex


On Fri, Dec 13, 2019 at 1:28 PM Diptyajit Das <bmedasdiptyajit at gmail.com>
wrote:

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>
> Dear all,
>
> I create noise projections from meg raw data to remove environmental
> artifacts (i.e., street car effects). I usually apply the projections to
> the data and then perform a ICA fit to remove other biological artifacts
> (i.e., ecg, eog). It seems like noise projections that are applied to the
> data are temporarily removed while fitting the ICA object to it. I can see
> that since the topographies of the noise projections are being replicated
> in ICA topographies. Is it true that even if the projections are applied to
> raw data before, they are kept separated while performing ICA fiting and
> added afterwards again? Can anyone tell me how it works in MNE?
>
> Best,
> Dip
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