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import os.path as op
import pytest
from mne.io import read_raw_fif
from mne import pick_types
from mne.preprocessing import find_ecg_events, create_ecg_epochs
from mne.utils import run_tests_if_main
data_path = op.join(op.dirname(__file__), '..', '..', 'io', 'tests', 'data')
raw_fname = op.join(data_path, 'test_raw.fif')
event_fname = op.join(data_path, 'test-eve.fif')
proj_fname = op.join(data_path, 'test-proj.fif')
def test_find_ecg():
"""Test find ECG peaks."""
# Test if ECG analysis will work on data that is not preloaded
raw = read_raw_fif(raw_fname, preload=False)
# once with mag-trick
# once with characteristic channel
for ch_name in ['MEG 1531', None]:
events, ch_ECG, average_pulse, ecg = find_ecg_events(
raw, event_id=999, ch_name=ch_name, return_ecg=True)
assert raw.n_times == ecg.shape[-1]
n_events = len(events)
_, times = raw[0, :]
assert 55 < average_pulse < 60
picks = pick_types(
raw.info, meg='grad', eeg=False, stim=False,
eog=False, ecg=True, emg=False, ref_meg=False,
exclude='bads')
# There should be no ECG channels, or else preloading will not be
# tested
assert 'ecg' not in raw
ecg_epochs = create_ecg_epochs(raw, picks=picks, keep_ecg=True)
assert len(ecg_epochs.events) == n_events
assert 'ECG-SYN' not in raw.ch_names
assert 'ECG-SYN' in ecg_epochs.ch_names
picks = pick_types(
ecg_epochs.info, meg=False, eeg=False, stim=False,
eog=False, ecg=True, emg=False, ref_meg=False,
exclude='bads')
assert len(picks) == 1
ecg_epochs = create_ecg_epochs(raw, ch_name='MEG 2641')
assert 'MEG 2641' in ecg_epochs.ch_names
# test with user provided ecg channel
raw.info['projs'] = list()
with pytest.warns(RuntimeWarning, match='unit for channel'):
raw.set_channel_types({'MEG 2641': 'ecg'})
create_ecg_epochs(raw)
raw.load_data().pick_types() # remove ECG
ecg_epochs = create_ecg_epochs(raw, keep_ecg=False)
assert len(ecg_epochs.events) == n_events
assert 'ECG-SYN' not in raw.ch_names
assert 'ECG-SYN' not in ecg_epochs.ch_names
run_tests_if_main()
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