Spectral analysis with LCMV

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Dear MNE developers,

We would like to use MNE/LCMV for spectral analysis on virtual sensors.?
?
Previously we used Fieldtrip for this purpose.
Function ft_sourceanalysis? created spatial filters, that we multiplied? to each data trial? to create
VERTUALSENSORS structure with field .trial{Ntrials}.{Nsources x Ntimepoints}.
ft_freqanalysis then produced power spectrum of dimensions: Ntrials x Nsources x Nfrequencies
?
What would be most efficient way to do the similar analysis in the MNE?
Best regards,
Viktoria

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You should be able to compute the LCMV source values using
apply_lcmv_epochs, then loop over the resulting STCs, passing stc.data to
psd_multitaper:

https://martinos.org/mne/stable/generated/mne.time_frequency.psd_multitaper.html

If you want it to be more efficient, you could write more complicated code
to compute the single-epoch spectral estimates (linearly, not computing
power or absolute value), apply the LCMV filters to these, then take the
power (or abs). But it would involve more complicated code.

Eric