[Mne_analysis] extracting high frequency broadband (HFB) envelope

[Eric Larson]

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>
> Strangely once I epoch the envelope with mne.epoch() using some equally
> spaced stimulus releated events, the resulting epochs contain some negative
> value in their entries. But is does not seems that epoching shift the
> origin x axis or does it?
>

Did you set `baseline=None`? The default
<https://mne.tools/dev/generated/mne.Epochs.html#mne.Epochs> is
`baseline=(None, 0.)` which would mean that your data are being baseline
corrected (which you probably don't want).

Eric
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