[Mne_analysis] Applying Inverse to Evoked vs Applying Inverse to Epochs and Averaging

[Alexandre Gramfort]

when you apply inverse operator to epochs you have more noise which
corresponds to the nave attribute in evoked (nave == number of
averaged epochs), which is 1 for single epochs.

also you have the SNR.

the consequence is that the regularization parameter is slightly
different when you apply the inverse to epochs or to evoked.

HTH
Alex



On Fri, Nov 3, 2017 at 4:11 PM, Rockhill, Alexander P.
<AROCKHILL at mgh.harvard.edu> wrote:
> Hi all,
>
>     I tried applying an inverse model to the evoked data and also applying
> inverse epochs directly to the same epochs that were averaged to make the
> evoked data and then averaging the data from the list of source space time
> courses, and these matrices weren't the same. Does anyone have any insight
> as to why this would be?
>
> Thanks,
>
> Alex
>
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