mne.time_frequency.tfr_morlet¶

mne.time_frequency.tfr_morlet(inst, freqs, n_cycles, use_fft=False, return_itc=True, decim=1, n_jobs=1, picks=None, zero_mean=True, average=True, output='power', verbose=None)[source]¶

Compute Time-Frequency Representation (TFR) using Morlet wavelets.

Same computation as tfr_array_morlet, but operates on Epochs objects instead of NumPy arrays.

Parameters

instEpochs | Evoked: The epochs or evoked object.
freqsndarray, shape (n_freqs,): The frequencies in Hz.
n_cyclesfloat | ndarray, shape (n_freqs,): The number of cycles globally or for each frequency.
use_fftbool, default False: The fft based convolution or not.
return_itcbool, default True: Return inter-trial coherence (ITC) as well as averaged power. Must be False for evoked data.
decimint | slice, default 1: To reduce memory usage, decimation factor after time-frequency decomposition. If int, returns tfr[…, ::decim]. If slice, returns tfr[…, decim].

Note

Decimation may create aliasing artifacts.
n_jobsint: The number of jobs to run in parallel (default 1). If -1, it is set to the number of CPU cores. Requires the joblib package.
picksarray_like of int | None, default None: The indices of the channels to decompose. If None, all available good data channels are decomposed.
zero_meanbool, default True: Make sure the wavelet has a mean of zero.

New in version 0.13.0.
averagebool, default True: If False return an EpochsTFR containing separate TFRs for each epoch. If True return an AverageTFR containing the average of all TFRs across epochs.

Note

Using average=True is functionally equivalent to using average=False followed by EpochsTFR.average(), but is more memory efficient.

New in version 0.13.0.
outputstr: Can be “power” (default) or “complex”. If “complex”, then average must be False.

New in version 0.15.0.
verbosebool | str | int | None: Control verbosity of the logging output. If None, use the default verbosity level. See the logging documentation and mne.verbose() for details. Should only be passed as a keyword argument.

Returns

powerAverageTFR | EpochsTFR: The averaged or single-trial power.
itcAverageTFR | EpochsTFR: The inter-trial coherence (ITC). Only returned if return_itc is True.