[Mne_analysis] Does the computation of the FWD solution depend on the bad channels?

[Scheltienne Mathieu]

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Dear all,

I am using MNE for EEG analysis and source localization. My question is: does the computation of the FWD operator (lead-field matrix) depend on the marked bad channels (given in the info parameter)?
Additionally, can I use the same lead-field matrix on 2 recordings with different ‘bad’ channels marked (assuming the electrode position/digitalization and MRI data did not change)?

I saw that ‘_prep_eeg_channels()’ is called with ‘exlude=()’ by the preparation of the fwd solution computation; thus it seems to me that the bad channels parameter isn’t relevant to the fwd solution computation.
Could someone confirm it?

Thanks, and have a great day,
Mathieu
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