Hi, I am trying to run ICA on my EEG data but the MNE didn’t have a montage for the EEG system I am using. So, I manually set up montage using EEG channel locations to produce digitized points but it’s not working at all. It’s giving me an error message that no digitization points were found. I ha…

Hello, we’d need to see more of your code to figure where things are going wrong. Are you sure you set the montage before fitting ICA?

Hello @BilalKhan and welcome to the forum! Since you seem to be using a standardized electrode placement scheme, and you don’t appear to have individually measured digitization points, I would suggest to simply use one of our built-in standard montages! So you could do, for example: raw.set_monta…

Hi, @richard Thank you for your answer. I tried using the code raw.set_montage('easycap-M1') command. However, it showed this error, see below: ValueError: DigMontage is only a subset of info. There are 2 channel positions not present in the DigMontage. The required channels are: [‘M1’, ‘M2’]. …

Hello @BilalKhan , [image] BilalKhan: ValueError: DigMontage is only a subset of info. There are 2 channel positions not present in the DigMontage. The required channels are: [‘M1’, ‘M2’]. I believe the mastoids are not included in the 10-05 system; if you don’t want to use them in your anal…

Hi @richard @cbnr @sappelhoff , I tried dropping off the M1 and M2 electrodes from the ICA analysis and the raw.set_montage('easycap-M1') worked as well but still there is an error in plotting ICA components. I have attached the screenshot of the output I got after setting up the montage to ‘raw’. …

This is not an error, just a (useful!) warning. Apparently, Cz and AFz have the wrong channel type (misc instead of eeg). This should be corrected via raw.set_channel_types(). Best wishes, Richard

Hi @richard @cbrnr @sappelhoff , Thank you for the help. But it seems I had attached the wrong image of the error message. I have attached the correct one now. The issue is that even after setting the montage to the raw, the ica components could not be plotted. The error message says ‘no digitizati…

Yes, please post your code (with Markdown formatting)! :slight_smile: Also, electrodes M1 and M2 are typically very close to the positions TP9 and TP10 in the 5%-style systems … so if you don’t want to drop them you can either consider renaming them (messy), or make a your own montage using Compute…

Thanks, everyone. Its working now.

<a name="p-21805-icaplot_componentsoutlinesskirt-warningrootdid-not-find-any-electrode-locations-in-the-info-object-will-attempt-to-use-digitization-points-instead-however-if-digitization-points-do-not-correspond-to-the-eeg-electrodes-this-will-lead-to-bad-results-please-verify-that-the-sensor-locations-in-the-plot-are-accurate-1" class="anchor" href="#p-21805-icaplot_componentsoutlinesskirt-warningrootdid-not-find-any-electrode-locations-in-the-info-object-will-attempt-to-use-digitization-points-instead-however-if-digitization-points-do-not-correspond-to-the-eeg-electrodes-this-will-lead-to-bad-results-please-verify-that-the-sensor-locations-in-the-plot-are-accurate-1" aria-label="Heading link"> ica.plot_components(outlines=“skirt”); WARNING:root:Did not find any electrode locations (in the info object), will attempt to use digitization points instead. However, if digitization points do not correspond to the EEG electrodes, this will lead to bad results. Please verify that the sensor locat…

you cannot plot a topography without setting the locations of the channels. See the set_montage / montage how to here: https://mne.tools/stable/auto_tutorials/intro/40_sensor_locations.html#tut-sensor-locations https://mne.tools/stable/auto_tutorials/evoked/30_eeg_erp.html#channel-locations Alex …

ICA error: No digitization points found

Support & Discussions

Topic		Replies	Views
No digitization points found. Support & Discussions	1	177	June 6, 2023
RuntimeError: No digitization points found. Support & Discussions preprocessing , eeg , visualization	12	3907	February 2, 2023
No valid channel positions found Support & Discussions preprocessing , eeg , ica	2	1194	August 23, 2022
Loading the montage on mne-python Mailing List Archive (read-only) list-archive	8	1161	March 22, 2020
No digitization found - ICA Mailing List Archive (read-only) list-archive	3	871	September 24, 2020

ICA error: No digitization points found

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