[Mne_analysis] What is an Epoch in MNE and Wavelet transformation

Eric Larson larson.eric.d at gmail.com
Wed Aug 22 13:27:30 EDT 2018
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The wavelet transformation in MNE implicitly windows the signal based on
the number of cycles per frequency (the Morlet kernel for each frequency is
only some finite number of samples long). In the end, the amplitude in each
frequency band is the result of a convolution with the Morlet kernel, so
the estimates are continuous, if I recall correctly.

As for what you extract from it, you get estimates of amplitude and phase
(from the complex values) at each time point. From there you have many
options depending on what you're actually trying to understand in your data.

Epochs are basically windows of time from the raw data. Take a look at the
epochs object tutorial and documentation, and try it out on your data.
Hopefully this will clear up any remaining confusion.

Eric
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