mne.time_frequency.EpochsTFRArray#

class mne.time_frequency.EpochsTFRArray(info, data, times, freqs, *, comment=None, method=None, events=None, event_id=None, selection=None, drop_log=None, metadata=None)[source]#

Data object for precomputed spectrotemporal representations of epoched data.

Parameters:

infomne.Info: The mne.Info object with information about the sensors and methods of measurement.
datandarray, shape (n_channels, n_freqs, n_times): The data.
timesndarray, shape (n_times,): The time values in seconds.
freqsndarray, shape (n_freqs,): The frequencies in Hz.
commentstr: Comment on the data, e.g., the experimental condition(s).
methodstr | None: Comment on the method used to compute the data, e.g., "hilbert". Default is None.
eventsndarray of int, shape (n_events, 3) | None: The identity and timing of experimental events, around which the epochs were created. See events for more information.If None, all integer event codes are set to 1 (i.e., all epochs are assumed to be of the same type) and their corresponding sample numbers are set as arbitrary, equally spaced sample numbers with a step size of len(times).
event_iddict | None: Mapping from condition descriptions (strings) to integer event codes.If None, all events in events will be included, and the event_id attribute will be a dict mapping a string version of each integer event ID to the corresponding integer.
selectioniterable | None: Iterable of indices of selected epochs. If None, will be automatically generated, corresponding to all non-zero events.
drop_logtuple | None: Tuple of tuple of strings indicating which epochs have been marked to be ignored.
metadatainstance of pandas.DataFrame | None: A pandas.DataFrame specifying metadata about each epoch. If not None, len(metadata) must equal len(events). For save/load compatibility, the DataFrame may only contain str, int, float, and bool values. If not None, then pandas-style queries may be used to select subsets of data, see mne.Epochs.__getitem__(). When the EpochsTFR object is subsetted, the metadata is subsetted accordingly, and the row indices will be modified to match EpochsTFR.selection.

Attributes:

baselinearray_like, shape (2,): Start and end of the baseline period (in seconds).
ch_nameslist: The channel names.
commentstr: Comment on the data, e.g., the experimental condition(s).
drop_logtuple | None: Tuple of tuple of strings indicating which epochs have been marked to be ignored.
event_iddict: Mapping from condition descriptions (strings) to integer event codes.
eventsndarray of int, shape (n_events, 3): The events array.
freqsarray: The frequencies at which power estimates were computed.
infomne.Info: The mne.Info object with information about the sensors and methods of measurement.
metadatainstance of pandas.DataFrame | None: Get the metadata.
methodstr: The method used to compute the time-frequency power estimates.
selectionndarray: Array of indices of selected epochs (i.e., epochs that were not rejected, dropped, or ignored).
sfreqint | float: Sampling frequency of the data.
shapetuple of int: Data shape.

Methods

`__add__`(other)	Add two TFR instances.
`__contains__`(ch_type)	Check channel type membership.
`__getitem__`(item)	Subselect epochs from an EpochsTFR.
`__iter__`()	Facilitate iteration over epochs.
`__len__`()	Return the number of epochs.
`__mul__`(num)	Multiply a TFR instance by a scalar.
`__sub__`(other)	Subtract two TFR instances.
`add_channels`(add_list[, force_update_info])	Append new channels to the instance.
`add_reference_channels`(ref_channels)	Add reference channels to data that consists of all zeros.
`apply_baseline`(baseline[, mode, verbose])	Baseline correct the data.
`average`([method, dim, copy])	Aggregate the EpochsTFR across epochs, frequencies, or times.
`copy`()	Return copy of the TFR instance.
`crop`([tmin, tmax, fmin, fmax, include_tmax])	Crop data to a given time interval in place.
`decimate`(decim[, offset, verbose])	Decimate the time-series data.
`drop`(indices[, reason, verbose])	Drop epochs based on indices or boolean mask.
`drop_channels`(ch_names[, on_missing])	Drop channel(s).
`get_channel_types`([picks, unique, only_data_chs])	Get a list of channel type for each channel.
`get_data`([picks, exclude, fmin, fmax, tmin, ...])	Get time-frequency data in NumPy array format.
`iter_evoked`([copy])	Iterate over EpochsTFR to yield a sequence of AverageTFR objects.
`next`([return_event_id])	Iterate over epoch data.
`pick`(picks[, exclude, verbose])	Pick a subset of channels.
`pick_channels`(ch_names[, ordered, verbose])
`pick_types`([meg, eeg, stim, eog, ecg, emg, ...])
`plot`([picks, exclude, tmin, tmax, fmin, ...])	Plot TFRs as two-dimensional time-frequency images.
`plot_joint`(*[, timefreqs, picks, exclude, ...])	Plot TFRs as a two-dimensional image with topomap highlights.
`plot_topo`([picks, baseline, mode, tmin, ...])	Plot a TFR image for each channel in a sensor layout arrangement.
`plot_topomap`([tmin, tmax, fmin, fmax, ...])	Plot topographic maps of specific time-frequency intervals of TFR data.
`reorder_channels`(ch_names)	Reorder channels.
`save`(fname, *[, overwrite, verbose])	Save time-frequency data to disk (in HDF5 format).
`shift_time`(tshift[, relative])	Shift time scale in epoched or evoked data.
`time_as_index`(times[, use_rounding])	Convert time to indices.
`to_data_frame`([picks, index, long_format, ...])	Export data in tabular structure as a pandas DataFrame.

See also

AverageTFR
mne.Epochs.compute_tfr
mne.Evoked.compute_tfr

__add__(other)[source]#

Add two TFR instances.

Parameters:

otherinstance of RawTFR | instance of EpochsTFR | instance of AverageTFR: The TFR instance to add. Must have the same type as self, and matching .times and .freqs attributes.

Returns:

tfrinstance of RawTFR | instance of EpochsTFR | instance of AverageTFR: A new TFR instance, of the same type as self.

__contains__(ch_type)[source]#

Check channel type membership.

Parameters:

ch_typestr: Channel type to check for. Can be e.g. 'meg', 'eeg', 'stim', etc.

Returns:

inbool: Whether or not the instance contains the given channel type.

Examples

Channel type membership can be tested as:

>>> 'meg' in inst  
True
>>> 'seeg' in inst  
False

__getitem__(item)[source]#

Subselect epochs from an EpochsTFR.

Parameters:

itemint | slice | array_like | str: Access options are the same as for Epochs objects, see the docstring Notes section of mne.Epochs.__getitem__() for explanation.

Returns:

datandarray: The selected time-frequency data. Shape will be (n_epochs, n_channels, n_freqs, n_times) for Morlet, Stockwell, and aggregated (output='power') multitaper methods, or (n_epochs, n_channels, n_tapers, n_freqs, n_times) for unaggregated (output='complex') multitaper method.

__iter__()[source]#

Facilitate iteration over epochs.

This method resets the object iteration state to the first epoch.

Notes

This enables the use of this Python pattern:

>>> for epoch in epochs:  
>>>     print(epoch)  

Where epoch is given by successive outputs of mne.Epochs.next().

__len__()[source]#

Return the number of epochs.

Returns:

n_epochsint: The number of remaining epochs.

Notes

This function only works if bad epochs have been dropped.

Examples

This can be used as:

>>> epochs.drop_bad()  
>>> len(epochs)  
43
>>> len(epochs.events)  
43

__mul__(num)[source]#

Multiply a TFR instance by a scalar.

Parameters:

numint | float: The number to multiply by.

Returns:

tfrinstance of RawTFR | instance of EpochsTFR | instance of AverageTFR: A new TFR instance, of the same type as self.

__sub__(other)[source]#

Subtract two TFR instances.

Parameters:

otherinstance of RawTFR | instance of EpochsTFR | instance of AverageTFR: The TFR instance to subtract. Must have the same type as self, and matching .times and .freqs attributes.

Returns:

tfrinstance of RawTFR | instance of EpochsTFR | instance of AverageTFR: A new TFR instance, of the same type as self.

add_channels(add_list, force_update_info=False)[source]#

Append new channels to the instance.

Parameters:

add_listlist: A list of objects to append to self. Must contain all the same type as the current object.
force_update_infobool: If True, force the info for objects to be appended to match the values in self. This should generally only be used when adding stim channels for which important metadata won’t be overwritten.

New in v0.12.

Returns:

instinstance of Raw, Epochs, or Evoked: The modified instance.

See also

drop_channels

Notes

If self is a Raw instance that has been preloaded into a numpy.memmap instance, the memmap will be resized.

add_reference_channels(ref_channels)[source]#

Add reference channels to data that consists of all zeros.

Adds reference channels to data that were not included during recording. This is useful when you need to re-reference your data to different channels. These added channels will consist of all zeros.

Parameters:

ref_channelsstr | list of str: Name of the electrode(s) which served as the reference in the recording. If a name is provided, a corresponding channel is added and its data is set to 0. This is useful for later re-referencing.

Returns:

instinstance of Raw | Epochs | Evoked: The modified instance.

apply_baseline(baseline, mode='mean', verbose=None)[source]#

Baseline correct the data.

Parameters:

baselineNone | tuple of length 2

The time interval to consider as “baseline” when applying baseline correction. If None, do not apply baseline correction. If a tuple (a, b), the interval is between a and b (in seconds), including the endpoints. If a is None, the beginning of the data is used; and if b is None, it is set to the end of the data. If (None, None), the entire time interval is used.

Note

The baseline (a, b) includes both endpoints, i.e. all timepoints t such that a <= t <= b.

How baseline is computed is determined by the mode parameter.

Perform baseline correction by

subtracting the mean of baseline values (‘mean’)
dividing by the mean of baseline values (‘ratio’)
dividing by the mean of baseline values and taking the log (‘logratio’)
subtracting the mean of baseline values followed by dividing by the mean of baseline values (‘percent’)
subtracting the mean of baseline values and dividing by the standard deviation of baseline values (‘zscore’)
dividing by the mean of baseline values, taking the log, and dividing by the standard deviation of log baseline values (‘zlogratio’)

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:

instinstance of RawTFR, EpochsTFR, or AverageTFR: The modified instance.

average(method='mean', *, dim='epochs', copy=False)[source]#

Aggregate the EpochsTFR across epochs, frequencies, or times.

Parameters:

method“mean” | “median” | callable(): How to aggregate the data across the given dim. If callable, must take a NumPy array of shape (n_epochs, n_channels, n_freqs, n_times) and return an array with one fewer dimensions (which dimension is collapsed depends on the value of dim). Default is "mean".
dim“epochs” | “freqs” | “times”: The dimension along which to combine the data.
copybool: Whether to return a copy of the modified instance, or modify in place. Ignored when dim="epochs" or "times" because those options return different types (AverageTFR and EpochsSpectrum, respectively).

Returns:

tfrinstance of EpochsTFR | AverageTFR | EpochsSpectrum: The aggregated TFR object.

Notes

Passing in np.median is considered unsafe for complex data; pass the string "median" instead to compute the marginal median (i.e. the median of the real and imaginary components separately). See discussion here:

scipy/scipy#12676

property baseline#: Start and end of the baseline period (in seconds).

property ch_names#: The channel names.

property compensation_grade#: The current gradient compensation grade.

copy()[source]#

Return copy of the TFR instance.

Returns:

%(inst_tfr)s: A copy of the object.

crop(tmin=None, tmax=None, fmin=None, fmax=None, include_tmax=True)[source]#

Crop data to a given time interval in place.

Parameters:

tmin, tmaxfloat | None: First and last times to include, in seconds. None uses the first or last time present in the data. Default is tmin=None, tmax=None (all times).
fminfloat | None: Lowest frequency of selection in Hz.

New in v0.18.0.
fmaxfloat | None: Highest frequency of selection in Hz.

New in v0.18.0.
include_tmaxbool: If True (default), include tmax. If False, exclude tmax (similar to how Python indexing typically works).

New in v0.19.

Returns:

instinstance of RawTFR, EpochsTFR, or AverageTFR: The modified instance.

property data#: The time-frequency-resolved power estimates.

decimate(decim, offset=0, *, verbose=None)[source]#

Decimate the time-series data.

Parameters:

decimint: Factor by which to subsample the data.

Warning

Low-pass filtering is not performed, this simply selects every Nth sample (where N is the value passed to decim), i.e., it compresses the signal (see Notes). If the data are not properly filtered, aliasing artifacts may occur. See Resampling and decimating data for more information.
offsetint: Apply an offset to where the decimation starts relative to the sample corresponding to t=0. The offset is in samples at the current sampling rate.

New in v0.12.
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:

instMNE-object: The decimated object.

See also

mne.Epochs.resample
mne.io.Raw.resample

Notes

For historical reasons, decim / “decimation” refers to simply subselecting samples from a given signal. This contrasts with the broader signal processing literature, where decimation is defined as (quoting [1], p. 172; which cites [2]):

“… a general system for downsampling by a factor of M is the one shown in Figure 4.23. Such a system is called a decimator, and downsampling by lowpass filtering followed by compression [i.e, subselecting samples] has been termed decimation (Crochiere and Rabiner, 1983).”

Hence “decimation” in MNE is what is considered “compression” in the signal processing community.

Decimation can be done multiple times. For example, inst.decimate(2).decimate(2) will be the same as inst.decimate(4).

If decim is 1, this method does not copy the underlying data.

New in v0.10.0.

References

drop(indices, reason='USER', verbose=None)[source]#

Drop epochs based on indices or boolean mask.

Note

The indices refer to the current set of undropped epochs rather than the complete set of dropped and undropped epochs. They are therefore not necessarily consistent with any external indices (e.g., behavioral logs). To drop epochs based on external criteria, do not use the preload=True flag when constructing an Epochs object, and call this method before calling the mne.Epochs.drop_bad() or mne.Epochs.load_data() methods.

Parameters:

indicesarray of int or bool: Set epochs to remove by specifying indices to remove or a boolean mask to apply (where True values get removed). Events are correspondingly modified.
reasonstr: Reason for dropping the epochs (‘ECG’, ‘timeout’, ‘blink’ etc). Default: ‘USER’.
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:

epochsinstance of Epochs or EpochsTFR: The epochs with indices dropped. Operates in-place.

drop_channels(ch_names, on_missing='raise')[source]#

Drop channel(s).

Parameters:

ch_namesiterable or str: Iterable (e.g. list) of channel name(s) or channel name to remove.
on_missing‘raise’ | ‘warn’ | ‘ignore’: Can be 'raise' (default) to raise an error, 'warn' to emit a warning, or 'ignore' to ignore when entries in ch_names are not present in the raw instance.

New in v0.23.0.

Returns:

instinstance of Raw, Epochs, or Evoked: The modified instance.

See also

reorder_channels
pick_channels
pick_types

Notes

New in v0.9.0.

property freqs#: The frequencies at which power estimates were computed.

get_channel_types(picks=None, unique=False, only_data_chs=False)[source]#

Get a list of channel type for each channel.

Parameters:

picksstr | array_like | slice | None: Channels to include. Slices and lists of integers will be interpreted as channel indices. In lists, channel type strings (e.g., ['meg', 'eeg']) will pick channels of those types, channel name strings (e.g., ['MEG0111', 'MEG2623'] will pick the given channels. Can also be the string values 'all' to pick all channels, or 'data' to pick data channels. None (default) will pick all channels. Note that channels in info['bads'] will be included if their names or indices are explicitly provided.
uniquebool: Whether to return only unique channel types. Default is False.
only_data_chsbool: Whether to ignore non-data channels. Default is False.

Returns:

channel_typeslist: The channel types.

get_data(picks=None, exclude='bads', fmin=None, fmax=None, tmin=None, tmax=None, return_times=False, return_freqs=False)[source]#

Get time-frequency data in NumPy array format.

Parameters:

picksstr | array_like | slice | None: Channels to include. Slices and lists of integers will be interpreted as channel indices. In lists, channel type strings (e.g., ['meg', 'eeg']) will pick channels of those types, channel name strings (e.g., ['MEG0111', 'MEG2623'] will pick the given channels. Can also be the string values 'all' to pick all channels, or 'data' to pick data channels. None (default) will pick good data channels (excluding reference MEG channels). Note that channels in info['bads'] will be included if their names or indices are explicitly provided.
excludelist of str | ‘bads’: Channel names to exclude. If 'bads', channels in spectrum.info['bads'] are excluded; pass an empty list to include all channels (including “bad” channels, if any).
fmin, fmaxfloat: The lower- and upper-bound on frequencies of interest. Default is None which is equivalent to fmin=0, fmax=np.inf (spans all frequencies present in the data).
tmin, tmaxfloat | None: First and last times to include, in seconds. None uses the first or last time present in the data. Default is tmin=None, tmax=None (all times).
return_timesbool: Whether to return the time values for the requested time range. Default is False.
return_freqsbool: Whether to return the frequency bin values for the requested frequency range. Default is False.

Returns:

dataarray: The requested data in a NumPy array.
timesarray: The time values for the requested data range. Only returned if return_times is True.
freqsarray: The frequency values for the requested data range. Only returned if return_freqs is True.

Notes

Returns a copy of the underlying data (not a view).

iter_evoked(copy=False)[source]#

Iterate over EpochsTFR to yield a sequence of AverageTFR objects.

The AverageTFR objects will each contain a single epoch (i.e., no averaging is performed). This method resets the EpochTFR instance’s iteration state to the first epoch.

Parameters:

copybool: Whether to yield copies of the data and measurement info, or views/pointers.

property metadata#: Get the metadata.

property method#: The method used to compute the time-frequency power estimates.

next(return_event_id=False)[source]#

Iterate over epoch data.

Parameters:

return_event_idbool: If True, return both the epoch data and an event_id.

Returns:

epocharray of shape (n_channels, n_times): The epoch data.
event_idint: The event id. Only returned if return_event_id is True.

pick(picks, exclude=(), *, verbose=None)[source]#

Pick a subset of channels.

Parameters:

picksstr | array_like | slice | None: Channels to include. Slices and lists of integers will be interpreted as channel indices. In lists, channel type strings (e.g., ['meg', 'eeg']) will pick channels of those types, channel name strings (e.g., ['MEG0111', 'MEG2623'] will pick the given channels. Can also be the string values 'all' to pick all channels, or 'data' to pick data channels. None (default) will pick all channels. Note that channels in info['bads'] will be included if their names or indices are explicitly provided.
excludelist | str: Set of channels to exclude, only used when picking based on types (e.g., exclude=”bads” when picks=”meg”).
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.

New in v0.24.0.

Returns:

instinstance of Raw, Epochs, or Evoked: The modified instance.

pick_channels(ch_names, ordered=True, *, verbose=None)[source]#

Warning

LEGACY: New code should use inst.pick(…).

Pick some channels.

Parameters:

ch_nameslist: The list of channels to select.
orderedbool: If True (default), ensure that the order of the channels in the modified instance matches the order of ch_names.

New in v0.20.0.

Changed in version 1.7: The default changed from False in 1.6 to True in 1.7.
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.

New in v1.1.

Returns:

instinstance of Raw, Epochs, or Evoked: The modified instance.

See also

drop_channels
pick_types
reorder_channels

Notes

If ordered is False, the channel names given via ch_names are assumed to be a set, that is, their order does not matter. In that case, the original order of the channels in the data is preserved. Apart from using ordered=True, you may also use reorder_channels to set channel order, if necessary.

New in v0.9.0.

pick_types(meg=False, eeg=False, stim=False, eog=False, ecg=False, emg=False, ref_meg='auto', *, misc=False, resp=False, chpi=False, exci=False, ias=False, syst=False, seeg=False, dipole=False, gof=False, bio=False, ecog=False, fnirs=False, csd=False, dbs=False, temperature=False, gsr=False, eyetrack=False, include=(), exclude='bads', selection=None, verbose=None)[source]#

Warning

LEGACY: New code should use inst.pick(…).

Pick some channels by type and names.

Parameters:

megbool | str: If True include MEG channels. If string it can be ‘mag’, ‘grad’, ‘planar1’ or ‘planar2’ to select only magnetometers, all gradiometers, or a specific type of gradiometer.
eegbool: If True include EEG channels.
stimbool: If True include stimulus channels.
eogbool: If True include EOG channels.
ecgbool: If True include ECG channels.
emgbool: If True include EMG channels.
ref_megbool | str: If True include CTF / 4D reference channels. If ‘auto’, reference channels are included if compensations are present and meg is not False. Can also be the string options for the meg parameter.
miscbool: If True include miscellaneous analog channels.
respbool: If True include respiratory channels.
chpibool: If True include continuous HPI coil channels.
excibool: Flux excitation channel used to be a stimulus channel.
iasbool: Internal Active Shielding data (maybe on Triux only).
systbool: System status channel information (on Triux systems only).
seegbool: Stereotactic EEG channels.
dipolebool: Dipole time course channels.
gofbool: Dipole goodness of fit channels.
biobool: Bio channels.
ecogbool: Electrocorticography channels.
fnirsbool | str: Functional near-infrared spectroscopy channels. If True include all fNIRS channels. If False (default) include none. If string it can be ‘hbo’ (to include channels measuring oxyhemoglobin) or ‘hbr’ (to include channels measuring deoxyhemoglobin).
csdbool: EEG-CSD channels.
dbsbool: Deep brain stimulation channels.
temperaturebool: Temperature channels.
gsrbool: Galvanic skin response channels.
eyetrackbool | str: Eyetracking channels. If True include all eyetracking channels. If False (default) include none. If string it can be ‘eyegaze’ (to include eye position channels) or ‘pupil’ (to include pupil-size channels).
includelist of str: List of additional channels to include. If empty do not include any.
excludelist of str | str: List of channels to exclude. If ‘bads’ (default), exclude channels in info['bads'].
selectionlist of str: Restrict sensor channels (MEG, EEG, etc.) to this list of channel names.
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:

instinstance of Raw, Epochs, or Evoked: The modified instance.

See also

pick_channels

Notes

New in v0.9.0.

plot(picks=None, *, exclude=(), tmin=None, tmax=None, fmin=None, fmax=None, baseline=None, mode='mean', dB=False, combine=None, layout=None, yscale='auto', vlim=(None, None), cnorm=None, cmap=None, colorbar=True, title=None, mask=None, mask_style=None, mask_cmap='Greys', mask_alpha=0.1, axes=None, show=True, verbose=None)[source]#

Plot TFRs as two-dimensional time-frequency images.

Parameters:

picksstr | array_like | slice | None

Channels to include. Slices and lists of integers will be interpreted as channel indices. In lists, channel type strings (e.g., ['meg', 'eeg']) will pick channels of those types, channel name strings (e.g., ['MEG0111', 'MEG2623'] will pick the given channels. Can also be the string values 'all' to pick all channels, or 'data' to pick data channels. None (default) will pick good data channels. Note that channels in info['bads'] will be included if their names or indices are explicitly provided.

excludelist of str | ‘bads’

Channel names to exclude from being drawn. If 'bads', channels in spectrum.info['bads'] are excluded; pass an empty list to include all channels (including “bad” channels, if any).

tmin, tmaxfloat | None

First and last times to include, in seconds. None uses the first or last time present in the data. Default is tmin=None, tmax=None (all times).

fmin, fmaxfloat

The lower- and upper-bound on frequencies of interest. Default is None which is equivalent to fmin=0, fmax=np.inf (spans all frequencies present in the data).

baselineNone | tuple of length 2

Note

The baseline (a, b) includes both endpoints, i.e. all timepoints t such that a <= t <= b.

How baseline is computed is determined by the mode parameter.

Perform baseline correction by

subtracting the mean of baseline values (‘mean’) (default)
dividing by the mean of baseline values (‘ratio’)
dividing by the mean of baseline values and taking the log (‘logratio’)
subtracting the mean of baseline values followed by dividing by the mean of baseline values (‘percent’)
subtracting the mean of baseline values and dividing by the standard deviation of baseline values (‘zscore’)
dividing by the mean of baseline values, taking the log, and dividing by the standard deviation of log baseline values (‘zlogratio’)

dBbool

Whether to plot on a decibel-like scale. If True, plots 10 × log₁₀(spectral power).

combine‘mean’ | ‘rms’ | callable() | None

How to aggregate across channels. If None, plot one figure per selected channel. If a string, "mean" uses numpy.mean(), "rms" computes the root-mean-square. If callable(), it must operate on an array of shape (n_channels, n_freqs, n_times) and return an array of shape (n_freqs, n_times). Defaults to None.

Changed in version 1.3: Added support for callable.

layoutinstance of Layout | None

Layout instance specifying sensor positions (does not need to be specified for Neuromag data). If None (default), the layout is inferred from the data (if possible).

yscale‘auto’ | ‘linear’ | ‘log’

The scale of the y (frequency) axis. ‘linear’ gives linear y axis, ‘log’ gives log-spaced y axis and ‘auto’ detects if frequencies are log-spaced and if so sets the y axis to ‘log’. Default is ‘auto’.

New in v0.14.0.

vlimtuple of length 2

Lower and upper bounds of the colormap, typically a numeric value in the same units as the data. If both entries are None, the bounds are set at ± the maximum absolute value of the data (yielding a colormap with midpoint at 0), or (0, max(abs(data))) if the (possibly baselined) data are all-positive. Providing None for just one entry will set the corresponding boundary at the min/max of the data. Defaults to (None, None).

cnormmatplotlib.colors.Normalize | None

How to normalize the colormap. If None, standard linear normalization is performed. If not None, vmin and vmax will be ignored. See Matplotlib docs for more details on colormap normalization, and the ERDs example for an example of its use.

New in v0.24.

cmapmatplotlib colormap | (colormap, bool) | ‘interactive’ | None

Colormap to use. If tuple, the first value indicates the colormap to use and the second value is a boolean defining interactivity. In interactive mode the colors are adjustable by clicking and dragging the colorbar with left and right mouse button. Left mouse button moves the scale up and down and right mouse button adjusts the range. Hitting space bar resets the range. Up and down arrows can be used to change the colormap. If None, 'Reds' is used for data that is either all-positive or all-negative, and 'RdBu_r' is used otherwise. 'interactive' is equivalent to (None, True). Defaults to None.

Warning

Interactive mode works smoothly only for a small amount of topomaps. Interactive mode is disabled by default for more than 2 topomaps.

colorbarbool

Whether to add a colorbar to the plot. Default is True.

titlestr | ‘auto’ | None

Title for the plot. If "auto", will use the channel name (if combine is None) or state the number and method of combined channels used to generate the plot. If None, no title is shown. Default is None.

maskndarray | None

An array of boolean values, of the same shape as the data. Data that corresponds to False entries in the mask are plotted differently, as determined by mask_style, mask_alpha, and mask_cmap. Useful for, e.g., highlighting areas of statistical significance.

New in v0.16.0.

mask_styleNone | ‘both’ | ‘contour’ | ‘mask’

How to distinguish the masked/unmasked regions of the plot. If "contour", a line is drawn around the areas where the mask is True. If "mask", areas where the mask is False will be (partially) transparent, as determined by mask_alpha. If "both", both a contour and transparency are used. Default is None, which is silently ignored if mask is None and is interpreted like "both" otherwise.

New in v0.17.

mask_cmapmatplotlib colormap | str | None

Colormap to use for masked areas of the plot. If a str, must be a valid Matplotlib colormap name. If None, cmap is used for both masked and unmasked areas. Ignored if mask is None. Default is 'Greys'.

New in v0.17.

mask_alphafloat

Relative opacity of the masked region versus the unmasked region, given as a float between 0 and 1 (i.e., 0 means masked areas are not visible at all). Defaults to 0.1.

New in v0.16.0.

axesinstance of Axes | list of Axes | None

The axes to plot into. If None, a new Figure will be created with the correct number of axes. If Axes are provided (either as a single instance or a list of axes), the number of axes provided must match the number of picks. If combine is not None, axes must either be an instance of Axes, or a list of length 1. Default is None.

showbool

Show the figure if True.

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:

figslist of instances of matplotlib.figure.Figure: A list of figures containing the time-frequency power.

plot_joint(*, timefreqs=None, picks=None, exclude=(), combine='mean', tmin=None, tmax=None, fmin=None, fmax=None, baseline=None, mode='mean', dB=False, yscale='auto', vlim=(None, None), cnorm=None, cmap=None, colorbar=True, title=None, show=True, topomap_args=None, image_args=None, verbose=None)[source]#

Plot TFRs as a two-dimensional image with topomap highlights.

Parameters:

timefreqsNone | list of tuple | dict of tuple

The time-frequency point(s) for which topomaps will be plotted. See Notes.

picksstr | array_like | slice | None

excludelist of str | ‘bads’

Channel names to exclude. If 'bads', channels in info['bads'] are excluded; pass an empty list to include all channels (including “bad” channels, if any). Default is an empty tuple which includes all channels.

combine‘mean’ | ‘rms’ | callable()

How to aggregate across channels. If a string, "mean" uses numpy.mean(), "rms" computes the root-mean-square. If callable(), it must operate on an array of shape (n_channels, n_freqs, n_times) and return an array of shape (n_freqs, n_times). Defaults to "mean".

Changed in version 1.3: Added support for callable.

tmin, tmaxfloat | None

First and last times to include, in seconds. None uses the first or last time present in the data. Default is tmin=None, tmax=None (all times).

fmin, fmaxfloat

The lower- and upper-bound on frequencies of interest. Default is None which is equivalent to fmin=0, fmax=np.inf (spans all frequencies present in the data).

baselineNone | tuple of length 2

Note

The baseline (a, b) includes both endpoints, i.e. all timepoints t such that a <= t <= b.

How baseline is computed is determined by the mode parameter.

Perform baseline correction by

subtracting the mean of baseline values (‘mean’) (default)
dividing by the mean of baseline values (‘ratio’)
dividing by the mean of baseline values and taking the log (‘logratio’)
subtracting the mean of baseline values followed by dividing by the mean of baseline values (‘percent’)
subtracting the mean of baseline values and dividing by the standard deviation of baseline values (‘zscore’)
dividing by the mean of baseline values, taking the log, and dividing by the standard deviation of log baseline values (‘zlogratio’)

dBbool

Whether to plot on a decibel-like scale. If True, plots 10 × log₁₀(data).

yscale‘auto’ | ‘linear’ | ‘log’

vlimtuple of length 2

cnormmatplotlib.colors.Normalize | None

cmapmatplotlib colormap | str

The Colormap to use. If a str, must be a valid Matplotlib colormap name. Default is "RdBu_r".

colorbarbool

Whether to add a colorbar to the plot (for the topomap annotations). Not compatible with user-defined axes. Default is True.

titlestr | None

The title of the generated figure. If None (default), no title is displayed.

showbool

Show the figure if True.

topomap_argsdict | None

Keyword arguments to pass to mne.viz.plot_topomap(). axes and show are ignored. If times is not in this dict, automatic peak detection is used. Beyond that, if None, no customizable arguments will be passed. Defaults to None (i.e., an empty dict).

image_argsdict | None

Keyword arguments to pass to mne.time_frequency.AverageTFR.plot(). axes and show are ignored. Defaults to None (i.e., and empty dict).

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:

figmatplotlib.figure.Figure: The figure containing the topography.

Notes

timefreqs has three different modes: tuples, dicts, and auto. For (list of) tuple(s) mode, each tuple defines a pair (time, frequency) in s and Hz on the TFR plot. For example, to look at 10 Hz activity 1 second into the epoch and 3 Hz activity 300 ms into the epoch,

timefreqs=((1, 10), (.3, 3))

If provided as a dictionary, (time, frequency) tuples are keys and (time_window, frequency_window) tuples are the values — indicating the width of the windows (centered on the time and frequency indicated by the key) to be averaged over. For example,

timefreqs={(1, 10): (0.1, 2)}

would translate into a window that spans 0.95 to 1.05 seconds and 9 to 11 Hz. If None, a single topomap will be plotted at the absolute peak across the time-frequency representation.

New in v0.16.0.

plot_topo(picks=None, baseline=None, mode='mean', tmin=None, tmax=None, fmin=None, fmax=None, vmin=None, vmax=None, layout=None, cmap=None, title=None, dB=False, colorbar=True, layout_scale=0.945, show=True, border='none', fig_facecolor='k', fig_background=None, font_color='w', yscale='auto', verbose=None)[source]#

Plot a TFR image for each channel in a sensor layout arrangement.

Parameters:

picksstr | array_like | slice | None

baselineNone | tuple of length 2

Note

The baseline (a, b) includes both endpoints, i.e. all timepoints t such that a <= t <= b.

How baseline is computed is determined by the mode parameter.

Perform baseline correction by

subtracting the mean of baseline values (‘mean’) (default)
dividing by the mean of baseline values (‘ratio’)
dividing by the mean of baseline values and taking the log (‘logratio’)
subtracting the mean of baseline values followed by dividing by the mean of baseline values (‘percent’)
subtracting the mean of baseline values and dividing by the standard deviation of baseline values (‘zscore’)
dividing by the mean of baseline values, taking the log, and dividing by the standard deviation of log baseline values (‘zlogratio’)

tmin, tmaxfloat | None

First and last times to include, in seconds. None uses the first or last time present in the data. Default is tmin=None, tmax=None (all times).

fmin, fmaxfloat

The lower- and upper-bound on frequencies of interest. Default is None which is equivalent to fmin=0, fmax=np.inf (spans all frequencies present in the data).

vmin, vmaxfloat | None

Lower and upper bounds of the colormap, in the same units as the data. If vmin and vmax are both None, the bounds are set at ± the maximum absolute value of the data (yielding a colormap with midpoint at 0). If only one of vmin, vmax is None, will use min(data) or max(data), respectively.

layoutinstance of Layout | None

Layout instance specifying sensor positions (does not need to be specified for Neuromag data). If None (default), the layout is inferred from the data (if possible).

cmapmatplotlib colormap | str

The Colormap to use. If a str, must be a valid Matplotlib colormap name. Default is "RdBu_r".

titlestr | None

The title of the generated figure. If None (default), no title is displayed.

dBbool

Whether to plot on a decibel-like scale. If True, plots 10 × log₁₀(data).

colorbarbool

Whether to add a colorbar to the plot. Default is True.

layout_scalefloat

Scaling factor for adjusting the relative size of the layout on the canvas.

showbool

Show the figure if True.

borderstr

Matplotlib border style to be used for each sensor plot.

fig_facecolorstr | tuple

A matplotlib-compatible color to use for the figure background. Defaults to black.

fig_backgroundNone | array

A background image for the figure. This must be a valid input to matplotlib.pyplot.imshow(). Defaults to None.

font_colorcolor

The color of tick labels in the colorbar. Defaults to white.

yscale‘auto’ | ‘linear’ | ‘log’

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:

figmatplotlib.figure.Figure: The figure containing the topography.

plot_topomap(tmin=None, tmax=None, fmin=0.0, fmax=inf, *, ch_type=None, baseline=None, mode='mean', sensors=True, show_names=False, mask=None, mask_params=None, contours=6, outlines='head', sphere=None, image_interp='cubic', extrapolate='auto', border='mean', res=64, size=2, cmap=None, vlim=(None, None), cnorm=None, colorbar=True, cbar_fmt='%1.1e', units=None, axes=None, show=True)[source]#

Plot topographic maps of specific time-frequency intervals of TFR data.

Parameters:

tmin, tmaxfloat | None

First and last times to include, in seconds. None uses the first or last time present in the data. Default is tmin=None, tmax=None (all times).

fmin, fmaxfloat

The lower- and upper-bound on frequencies of interest. Default is fmin=0, fmax=np.inf (spans all frequencies present in the data).

The channel type to plot. For 'grad', the gradiometers are collected in pairs and the mean for each pair is plotted. If None the first available channel type from order shown above is used. Defaults to None.

baselinetuple or list of length 2

The time interval to apply rescaling / baseline correction. If None do not apply it. If baseline is (a, b) the interval is between “a (s)” and “b (s)”. If a is None the beginning of the data is used and if b is None then b is set to the end of the interval. If baseline is equal to (None, None) the whole time interval is used.

Perform baseline correction by

subtracting the mean baseline power (‘mean’)

dividing by the mean baseline power (‘ratio’)

dividing by the mean baseline power and taking the log (‘logratio’)

subtracting the mean baseline power followed by dividing by the mean baseline power (‘percent’)

subtracting the mean baseline power and dividing by the standard deviation of the baseline power (‘zscore’)

dividing by the mean baseline power, taking the log, and dividing by the standard deviation of the baseline power (‘zlogratio’)

If None no baseline correction is applied.

sensorsbool | str

Whether to add markers for sensor locations. If str, should be a valid matplotlib format string (e.g., 'r+' for red plusses, see the Notes section of plot()). If True (the default), black circles will be used.

show_namesbool | callable()

If True, show channel names next to each sensor marker. If callable, channel names will be formatted using the callable; e.g., to delete the prefix ‘MEG ‘ from all channel names, pass the function lambda x: x.replace('MEG ', ''). If mask is not None, only non-masked sensor names will be shown.

maskndarray of bool, shape (n_channels, n_times) | None

Array indicating channel-time combinations to highlight with a distinct plotting style (useful for, e.g. marking which channels at which times a statistical test of the data reaches significance). Array elements set to True will be plotted with the parameters given in mask_params. Defaults to None, equivalent to an array of all False elements.

mask_paramsdict | None

Additional plotting parameters for plotting significant sensors. Default (None) equals:

dict(marker='o', markerfacecolor='w', markeredgecolor='k',
        linewidth=0, markersize=4)

contoursint | array_like

The number of contour lines to draw. If 0, no contours will be drawn. If a positive integer, that number of contour levels are chosen using the matplotlib tick locator (may sometimes be inaccurate, use array for accuracy). If array-like, the array values are used as the contour levels. The values should be in µV for EEG, fT for magnetometers and fT/m for gradiometers. If colorbar=True, the colorbar will have ticks corresponding to the contour levels. Default is 6.

outlines‘head’ | dict | None

The outlines to be drawn. If ‘head’, the default head scheme will be drawn. If dict, each key refers to a tuple of x and y positions, the values in ‘mask_pos’ will serve as image mask. Alternatively, a matplotlib patch object can be passed for advanced masking options, either directly or as a function that returns patches (required for multi-axis plots). If None, nothing will be drawn. Defaults to ‘head’.

The sphere parameters to use for the head outline. Can be array-like of shape (4,) to give the X/Y/Z origin and radius in meters, or a single float to give just the radius (origin assumed 0, 0, 0). Can also be an instance of a spherical ConductorModel to use the origin and radius from that object. If 'auto' the sphere is fit to digitization points. If 'eeglab' the head circle is defined by EEG electrodes 'Fpz', 'Oz', 'T7', and 'T8' (if 'Fpz' is not present, it will be approximated from the coordinates of 'Oz'). None (the default) is equivalent to 'auto' when enough extra digitization points are available, and (0, 0, 0, 0.095) otherwise.

New in v0.20.

Changed in version 1.1: Added 'eeglab' option.

image_interpstr

The image interpolation to be used. Options are 'cubic' (default) to use scipy.interpolate.CloughTocher2DInterpolator, 'nearest' to use scipy.spatial.Voronoi or 'linear' to use scipy.interpolate.LinearNDInterpolator.

extrapolatestr

Options:

'box'
Extrapolate to four points placed to form a square encompassing all data points, where each side of the square is three times the range of the data in the respective dimension.
'local' (default for MEG sensors)
Extrapolate only to nearby points (approximately to points closer than median inter-electrode distance). This will also set the mask to be polygonal based on the convex hull of the sensors.
'head' (default for non-MEG sensors)
Extrapolate out to the edges of the clipping circle. This will be on the head circle when the sensors are contained within the head circle, but it can extend beyond the head when sensors are plotted outside the head circle.

Changed in version 0.21:

The default was changed to 'local' for MEG sensors.
'local' was changed to use a convex hull mask
'head' was changed to extrapolate out to the clipping circle.

borderfloat | ‘mean’

Value to extrapolate to on the topomap borders. If 'mean' (default), then each extrapolated point has the average value of its neighbours.

New in v0.20.

resint

The resolution of the topomap image (number of pixels along each side).

sizefloat

Side length of each subplot in inches.

cmapmatplotlib colormap | (colormap, bool) | ‘interactive’ | None

Warning

Interactive mode works smoothly only for a small amount of topomaps. Interactive mode is disabled by default for more than 2 topomaps.

vlimtuple of length 2

Lower and upper bounds of the colormap, typically a numeric value in the same units as the data. If both entries are None, the bounds are set at (min(data), max(data)). Providing None for just one entry will set the corresponding boundary at the min/max of the data. Defaults to (None, None).

New in v1.2.

cnormmatplotlib.colors.Normalize | None

New in v1.2.

colorbarbool

Plot a colorbar in the rightmost column of the figure.

cbar_fmtstr

Formatting string for colorbar tick labels. See Format Specification Mini-Language for details.

unitsstr | None

The units to use for the colorbar label. Ignored if colorbar=False. If None the label will be “AU” indicating arbitrary units. Default is None.

axesinstance of Axes | None

The axes to plot into. If None, a new Figure will be created. Default is None.

showbool

Show the figure if True.

Returns:

figmatplotlib.figure.Figure: The figure containing the topography.

reorder_channels(ch_names)[source]#

Reorder channels.

Parameters:

ch_nameslist: The desired channel order.

Returns:

instinstance of Raw, Epochs, or Evoked: The modified instance.

See also

drop_channels
pick_types
pick_channels

Notes

Channel names must be unique. Channels that are not in ch_names are dropped.

New in v0.16.0.

save(fname, *, overwrite=False, verbose=None)[source]#

Save time-frequency data to disk (in HDF5 format).

Parameters:

fnamepath-like: Path of file to save to, which should end with -tfr.h5 or -tfr.hdf5.
overwritebool: If True (default False), overwrite the destination file if it exists.
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.

See also

mne.time_frequency.read_tfrs

property sfreq#: Sampling frequency of the data.

property shape#: Data shape.

shift_time(tshift, relative=True)[source]#

Shift time scale in epoched or evoked data.

Parameters:

tshiftfloat: The (absolute or relative) time shift in seconds. If relative is True, positive tshift increases the time value associated with each sample, while negative tshift decreases it.
relativebool: If True, increase or decrease time values by tshift seconds. Otherwise, shift the time values such that the time of the first sample equals tshift.

Returns:

epochsMNE-object: The modified instance.

Notes

This method allows you to shift the time values associated with each data sample by an arbitrary amount. It does not resample the signal or change the data values in any way.

time_as_index(times, use_rounding=False)[source]#

Convert time to indices.

Parameters:

timeslist-like | float | int: List of numbers or a number representing points in time.
use_roundingbool: If True, use rounding (instead of truncation) when converting times to indices. This can help avoid non-unique indices.

Returns:

indexndarray: Indices corresponding to the times supplied.

property times#: The time points present in the data (in seconds).

property tmax#: Last time point.

property tmin#: First time point.

to_data_frame(picks=None, index=None, long_format=False, time_format=None, *, verbose=None)[source]#

Export data in tabular structure as a pandas DataFrame.

Channels are converted to columns in the DataFrame. By default, additional columns 'time', 'freq', 'epoch', and 'condition' (epoch event description) are added, unless index is not None (in which case the columns specified in index will be used to form the DataFrame’s index instead). 'epoch', and 'condition' are not supported for AverageTFR.

Parameters:

picksstr | array_like | slice | None: Channels to include. Slices and lists of integers will be interpreted as channel indices. In lists, channel type strings (e.g., ['meg', 'eeg']) will pick channels of those types, channel name strings (e.g., ['MEG0111', 'MEG2623'] will pick the given channels. Can also be the string values 'all' to pick all channels, or 'data' to pick data channels. None (default) will pick all channels. Note that channels in info['bads'] will be included if their names or indices are explicitly provided.
indexstr | list of str | None: Kind of index to use for the DataFrame. If None, a sequential integer index (pandas.RangeIndex) will be used. If 'time', a pandas.Index or pandas.TimedeltaIndex will be used (depending on the value of time_format). If a list of two or more string values, a pandas.MultiIndex will be created. Valid string values are 'time', 'freq', 'epoch', and 'condition' for EpochsTFR and 'time' and 'freq' for AverageTFR. Defaults to None.
long_formatbool: If True, the DataFrame is returned in long format where each row is one observation of the signal at a unique combination of time point, channel, epoch number, and condition. For convenience, a ch_type column is added to facilitate subsetting the resulting DataFrame. Defaults to False.
time_formatstr | None: Desired time format. If None, no conversion is applied, and time values remain as float values in seconds. If 'ms', time values will be rounded to the nearest millisecond and converted to integers. If 'timedelta', time values will be converted to pandas.Timedelta values. Default is None.

New in v0.23.
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:

dfinstance of pandas.DataFrame: A dataframe suitable for usage with other statistical/plotting/analysis packages.

Examples using `mne.time_frequency.EpochsTFRArray`#

Time-frequency on simulated data (Multitaper vs. Morlet vs. Stockwell vs. Hilbert)

mne.time_frequency.EpochsTFRArray#

Examples using mne.time_frequency.EpochsTFRArray#

Examples using `mne.time_frequency.EpochsTFRArray`#