[Mne_analysis] Best way to apply eye blink projections with the common average

[Mainak Jas]

Hi Matt,

You are indeed correct. Average reference will not only attenuate the eye
blink but may also spread it to other sensors. Therefore, it is probably
better to apply it after eye blinks have been removed. The average
reference is probably added by default while plotting the raw data. Do you
have the problem even when you remove the proj using raw.del_proj() and
turn off add_eeg_ref or avg_ref everywhere?

Mainak

On Wed, Aug 24, 2016 at 7:31 PM, Boggess, Matthew Jozsef <
MBOGGESS at mgh.harvard.edu> wrote:

> Hello everyone,
>
> By default, MNE seems to add an average reference projection to the raw
> data. I then noticed that when computing an eye blink EOG projection (using
> compute_proj_eog) the average reference projection gets applied prior to
> the computation of the projection. However, my intuition would be that you
> would not want to apply the average reference projection first because it
> will attenuate the eye blink artifacts and consequently make the periods
> where you estimate the eye blink noise subspace relatively less dominated
> by the eye blinks. Is there a recommended ordering to computing and
> applying these projections?
>
> Thanks in advance!
> Matt
>
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