ICA components seem to be strange

[shirinV (Shirin)]

• MNE-Python version: 0.23.0
• operating system:

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When I apply ICA on my MEG data (.con) files for artificat detection, I get figures that I feel seem to be strange.

Examples:

Here is my code:

meg_file_dir = "Con_" + session_date + "_" + session_name + "_BESA[con].con"  #fixme  
    
raw = mne.io.read_raw_kit(parent_dir_meg + "/" + meg_file_dir)
meg_raw = raw.copy()

ecg_evoked = create_ecg_epochs(meg_raw).average()
ecg_evoked.apply_baseline(baseline=(None, -0.2))
    
print("ECG Info")
print(ecg_evoked)
    
#Filtering to remove slow drifts
filt_raw = meg_raw.copy()
filt_raw.load_data().filter(l_freq=1., h_freq=None)
    
    
ica = ICA(n_components=15, max_iter='auto', random_state=97)
ica.fit(filt_raw)
    
meg_raw.load_data()
ica.plot_sources(meg_raw, show_scrollbars=False)

ica.plot_components()

print("Please enter first component")
c1 = input()
    
print("Please enter second component")
c2 = input()
    
print("User components are ")
print(c1, c2)
    
ica.exclude = [c1, c2]
ica.apply(filt_raw)

Do you know what might be wrong?

[agramfort (Alexandre Gramfort)]

you seem to have a problem of head position in the device

Alex

[shirinV (Shirin)]

In the future steps (when we align the MRI with MEG), will this problem be solved or shouId I perform the experiment again?

[agramfort (Alexandre Gramfort)]

was the head well positioned in the device during the experiment?

to know if it’s an acquisition problem or a software issue.

Alex

[shirinV (Shirin)]

Sorry for my late reply.
I guess it was positioned correctly. We put some small pillows around the subjects face to avoid movement and I think we always check that the head is completely inside the device