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In Gonzalez-Moreno et al., 2014, a SNR was computed to compare the quality of artifact correction by MaxFilter SSS and Maxfiter tSSS. Maybe in our case we could compute a SNR before and after Maxfilter? It would be better if this step is an App. This App would take in input the .fif file before MaxFilter and the .fif file after MaxFilter and would return a report.
To compute this SNR:
Create epochs
Compute for each epoch its mean amplitude across all electrodes and times
Compute the mean of all the mean amplitudes of each epoch
Compute the standard error of that mean