Compare the different ICA algorithms in MNE

Different ICA algorithms are fit to raw MEG data, and the corresponding maps are displayed.

# Authors: Pierre Ablin <pierreablin@gmail.com>
#
# License: BSD-3-Clause
# Copyright the MNE-Python contributors.

from time import time

import mne
from mne.datasets import sample
from mne.preprocessing import ICA

print(__doc__)

Read and preprocess the data. Preprocessing consists of:

• MEG channel selection

• 1-30 Hz band-pass filter

data_path = sample.data_path()
meg_path = data_path / "MEG" / "sample"
raw_fname = meg_path / "sample_audvis_filt-0-40_raw.fif"

raw = mne.io.read_raw_fif(raw_fname).crop(0, 60).pick("meg").load_data()

reject = dict(mag=5e-12, grad=4000e-13)
raw.filter(1, 30, fir_design="firwin")

Define a function that runs ICA on the raw MEG data and plots the components

def run_ica(method, fit_params=None):
    ica = ICA(
        n_components=20,
        method=method,
        fit_params=fit_params,
        max_iter="auto",
        rng=29,
    )
    t0 = time()
    ica.fit(raw, reject=reject)
    fit_time = time() - t0
    title = f"ICA decomposition using {method} (took {fit_time:.1f}s)"
    ica.plot_components(title=title)

FastICA

run_ica("fastica")

Picard

run_ica("picard")

Infomax

run_ica("infomax")

Extended Infomax

run_ica("infomax", fit_params=dict(extended=True))

Estimated memory usage: 0 MB