[Mne_analysis] Noise covariance matrix

[Denis A. Engemann]

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Hi Laura,

To me the safest thing is bandpass filtering at raw stage, e.g., prior to ICA.
Then you keep processing identical for data and noise covariance and just use the baseline segments from the otherwise  identically processed epochs.
Have you tried that?

Denis

> On Mar 26, 2020, at 4:11 PM, Laura Munkki <lauramunkki at gmail.com> wrote:
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> Hi Denis,
> Thank you very much for your reply.
> I did maxfiltering and ICA for the raw data, so these steps are applied for both types of epochs, evoked responses and NCM. But I did not use any band-pass filters before averaging. I filtered only averaged ERPs just before source reconstruction. So, if I filter NCM epochs, it will not be the same. My question is: when should I apply a band-pass filter for the NCM? I tried to apply it to the NCM-epochs file, but the result was distorted: instead of sources around auditory cortex I've got several sources in unpredictable locations. But when I tried to use NCM calculated for unfiltered NCM-epochs, the sources were around auditory cortex and had much stronger amplitude.
> Looking forward for your answer,
> Thank you very much for helping me,
> Laura.
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