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06a-apply_ica.py
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06a-apply_ica.py
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"""
===============
06. Apply ICA
===============
Blinks and ECG artifacts are automatically detected and the corresponding ICA
components are removed from the data.
This relies on the ICAs computed in 05-run_ica.py
!! If you manually add components to remove (config.rejcomps_man),
make sure you did not re-run the ICA in the meantime. Otherwise (especially if
the random state was not set, or you used a different machine, the component
order might differ).
"""
import os.path as op
import mne
from mne.parallel import parallel_func
from mne.preprocessing import read_ica
from mne.preprocessing import create_eog_epochs, create_ecg_epochs
from mne.report import Report
import numpy as np
import config
def run_evoked(subject):
print("Processing subject: %s" % subject)
meg_subject_dir = op.join(config.meg_dir, subject)
# load epochs to reject ICA components
extension = '-epo'
fname_in = op.join(meg_subject_dir,
config.base_fname.format(**locals()))
epochs = mne.read_epochs(fname_in, preload=True)
extension = 'cleaned-epo'
fname_out = op.join(meg_subject_dir,
config.base_fname.format(**locals()))
print("Input: ", fname_in)
print("Output: ", fname_out)
# load first run of raw data for ecg /eog epochs
raw_list = list()
print(" Loading one run from raw data")
extension = config.runs[0] + '_sss_raw'
raw_fname_in = op.join(meg_subject_dir,
config.base_fname.format(**locals()))
raw = mne.io.read_raw_fif(raw_fname_in, preload=True)
# run ICA on MEG and EEG
picks_meg = mne.pick_types(raw.info, meg=True, eeg=False,
eog=False, stim=False, exclude='bads')
picks_eeg = mne.pick_types(raw.info, meg=False, eeg=True,
eog=False, stim=False, exclude='bads')
all_picks = {'meg': picks_meg, 'eeg': picks_eeg}
for ch_type in ['meg', 'eeg']:
print(ch_type)
picks = all_picks[ch_type]
# Load ICA
fname_ica = op.join(meg_subject_dir,
'{0}_{1}_{2}-ica.fif'.format(subject, config.study_name,
ch_type))
print('Reading ICA: ' + fname_ica)
ica = read_ica(fname=fname_ica)
pick_ecg = mne.pick_types(raw.info, meg=False, eeg=False,
ecg=True, eog=False)
# ECG
# either needs an ecg channel, or avg of the mags (i.e. MEG data)
if pick_ecg or ch_type == 'meg':
picks_ecg = np.concatenate([picks, pick_ecg])
# Create ecg epochs
if ch_type == 'meg':
reject = {'mag': config.reject['mag'],
'grad': config.reject['grad']}
elif ch_type == 'eeg':
reject = {'eeg': config.reject['eeg']}
ecg_epochs = create_ecg_epochs(raw, picks=picks_ecg, reject=reject,
baseline=(None, 0), tmin=-0.5,
tmax=0.5)
ecg_average = ecg_epochs.average()
# XXX I had to lower the threshold for ctps (default 0.25), otherwise it does not
# find any components
# check how this behaves on other data
ecg_inds, scores = ica.find_bads_ecg(ecg_epochs, method='ctps',
threshold=0.1)
del ecg_epochs
if config.plot:
report_name = op.join(meg_subject_dir,
'{0}_{1}_{2}-reject_ica.html'.format(subject, config.study_name,
ch_type))
report = Report(report_name, verbose=False)
# Plot r score
report.add_figs_to_section(ica.plot_scores(scores, exclude=ecg_inds),
captions=ch_type.upper() + ' - ECG - '
+ 'R scores')
# Plot source time course
report.add_figs_to_section(ica.plot_sources(ecg_average, exclude=ecg_inds),
captions=ch_type.upper() + ' - ECG - '
+ 'Sources time course')
# Plot source time course
report.add_figs_to_section(ica.plot_overlay(ecg_average, exclude=ecg_inds),
captions=ch_type.upper() + ' - ECG - '
+ 'Corrections')
else:
print('no ECG channel!')
# EOG
pick_eog = mne.pick_types(raw.info, meg=False, eeg=False,
ecg=False, eog=True)
if pick_eog:
print('using EOG channel')
picks_eog = np.concatenate([picks, pick_eog])
# Create eog epochs
eog_epochs = create_eog_epochs(raw, picks=picks_eog, reject=None,
baseline=(None, 0), tmin=-0.5,
tmax=0.5)
eog_average = eog_epochs.average()
eog_inds, scores = ica.find_bads_eog(eog_epochs)
del eog_epochs
if config.plot:
# Plot r score
report.add_figs_to_section(ica.plot_scores(scores, exclude=eog_inds),
captions=ch_type.upper() + ' - EOG - '
+ 'R scores')
# Plot source time course
report.add_figs_to_section(ica.plot_sources(eog_average, exclude=eog_inds),
captions=ch_type.upper() + ' - EOG - '
+ 'Sources time course')
# Plot source time course
report.add_figs_to_section(ica.plot_overlay(eog_average, exclude=eog_inds),
captions=ch_type.upper() + ' - EOG - '
+ 'Corrections')
report.save(report_name, overwrite=True, open_browser=False)
else:
print('no EOG channel!')
ica_reject = (list(ecg_inds) + list(eog_inds) +
list(config.rejcomps_man[subject][ch_type]))
# now reject the components
print('Rejecting from ' + ch_type + ': ' + str(ica_reject))
epochs = ica.apply(epochs, exclude=ica_reject)
print('Saving epochs')
epochs.save(fname_out)
if config.plot:
report.add_figs_to_section(ica.plot_overlay(raw.copy(), exclude=ica_reject),
captions=ch_type.upper() +
' - ALL(epochs) - ' + 'Corrections')
parallel, run_func, _ = parallel_func(run_evoked, n_jobs=config.N_JOBS)
parallel(run_func(subject) for subject in config.subjects_list)