mne.preprocessing.compute_proj_ecg¶

mne.preprocessing.compute_proj_ecg(raw, raw_event=None, tmin=- 0.2, tmax=0.4, n_grad=2, n_mag=2, n_eeg=2, l_freq=1.0, h_freq=35.0, average=True, filter_length='10s', n_jobs=1, ch_name=None, reject={'mag': 3e-12}, flat=None, bads=[], avg_ref=False, no_proj=False, event_id=999, ecg_l_freq=5, ecg_h_freq=35, tstart=0.0, qrs_threshold='auto', filter_method='fir', iir_params=None, copy=True, return_drop_log=False, meg='separate', verbose=None)[source]¶

Compute SSP (signal-space projection) vectors for ECG artifacts.

This function will:

Filter the ECG data channel.
Find ECG R wave peaks using mne.preprocessing.find_ecg_events().
Filter the raw data.
Create Epochs around the R wave peaks, capturing the heartbeats.
Optionally average the Epochs to produce an Evoked if average=True was passed (default).
Calculate SSP projection vectors on that data to capture the artifacts.

Note

Raw data will be loaded if it hasn’t been preloaded already.

Parameters

rawmne.io.Raw: Raw input file.
raw_eventmne.io.Raw or None: Raw file to use for event detection (if None, raw is used).
tminfloat: Time before event in seconds.
tmaxfloat: Time after event in seconds.
n_gradint: Number of SSP vectors for gradiometers.
n_magint: Number of SSP vectors for magnetometers.
n_eegint: Number of SSP vectors for EEG.
l_freqfloat | None: Filter low cut-off frequency for the data channels in Hz.
h_freqfloat | None: Filter high cut-off frequency for the data channels in Hz.
averagebool: Compute SSP after averaging. Default is True.
filter_lengthstr | int | None: Number of taps to use for filtering.
n_jobsint: The number of jobs to run in parallel (default 1). Requires the joblib package.
ch_namestr | None: Channel to use for ECG detection (Required if no ECG found).
rejectdict | None: Epoch rejection configuration (see Epochs).
flatdict | None: Epoch flat configuration (see Epochs).
badslist: List with (additional) bad channels.
avg_refbool: Add EEG average reference proj.
no_projbool: Exclude the SSP projectors currently in the fiff file.
event_idint: ID to use for events.
ecg_l_freqfloat: Low pass frequency applied to the ECG channel for event detection.
ecg_h_freqfloat: High pass frequency applied to the ECG channel for event detection.
tstartfloat: Start artifact detection after tstart seconds.
qrs_thresholdfloat | str: Between 0 and 1. qrs detection threshold. Can also be “auto” to automatically choose the threshold that generates a reasonable number of heartbeats (40-160 beats / min).
filter_methodstr: Method for filtering (‘iir’ or ‘fir’).
iir_paramsdict | None: Dictionary of parameters to use for IIR filtering. See mne.filter.construct_iir_filter for details. If iir_params is None and method=”iir”, 4th order Butterworth will be used.
copybool: If False, filtering raw data is done in place. Defaults to True.
return_drop_logbool: If True, return the drop log.

New in version 0.15.
megstr: Can be ‘separate’ (default) or ‘combined’ to compute projectors for magnetometers and gradiometers separately or jointly. If ‘combined’, n_mag == n_grad is required and the number of projectors computed for MEG will be n_mag.

New in version 0.18.
verbosebool, str, int, or None: If not None, override default verbose level (see mne.verbose() and Logging documentation for more). If used, it should be passed as a keyword-argument only.

Returns