# \#referencing **URL:** https://mne.discourse.group/tag/referencing/73.md [Latest](https://mne.discourse.group/latest.md) · [Categories](https://mne.discourse.group/categories.md) · [Tags](https://mne.discourse.group/tags.md) --- ## [Best practices for preprocessing low-density (8-channel) EEG for frontal theta and parietal alpha](https://mne.discourse.group/t/best-practices-for-preprocessing-low-density-8-channel-eeg-for-frontal-theta-and-parietal-alpha/11542)
**Author:** [@carmenolsthoorn](https://mne.discourse.group/u/carmenolsthoorn)\ **Replies:** 0\ **Last updated:** [October 20, 2025, 10:00am UTC](https://mne.discourse.group/t/best-practices-for-preprocessing-low-density-8-channel-eeg-for-frontal-theta-and-parietal-alpha/11542 "2025-10-20T10:00:02Z")
Hi! I have implemented a preprocessing pipeline in Python (MNE) and would appreciate guidance on best practices for artifact correction and bad segment handling with this low-density setup. Here are the steps I currentl… --- ## [Trouble in Re-referencing my data to both earlobes in EEGLab](https://mne.discourse.group/t/trouble-in-re-referencing-my-data-to-both-earlobes-in-eeglab/6921)
**Author:** [@MariaPiresCoelho](https://mne.discourse.group/u/MariaPiresCoelho)\ **Replies:** 2\ **Last updated:** [May 19, 2023, 1:11pm UTC](https://mne.discourse.group/t/trouble-in-re-referencing-my-data-to-both-earlobes-in-eeglab/6921 "2023-05-19T13:11:04Z")
Hi, Firstly, thank you for the open discussion on EEGLab matters. I am currently preprocessing my data and discourse groups like these are very useful. I am having difficulties in re-referencing my data. By default in… --- ## [Interpolate\_bads: "ValueError: array must not contain infs or NaNs"](https://mne.discourse.group/t/interpolate-bads-valueerror-array-must-not-contain-infs-or-nans/5632)
**Author:** [@FranziMNE](https://mne.discourse.group/u/FranziMNE)\ **Replies:** 14\ **Last updated:** [September 26, 2022, 9:52am UTC](https://mne.discourse.group/t/interpolate-bads-valueerror-array-must-not-contain-infs-or-nans/5632 "2022-09-26T09:52:59Z")
Hello :slight\_smile: since I accidently set an eeg electrode, my mastoid reference, as “eog”, and now fixed it and set it to “eeg”, I get an error when I want to interpolate the data. When I drop bad channels and then r… --- ## [How to add channels not present on DigMontage for reference](https://mne.discourse.group/t/how-to-add-channels-not-present-on-digmontage-for-reference/4007)
**Author:** [@icasso](https://mne.discourse.group/u/icasso)\ **Replies:** 1\ **Last updated:** [November 23, 2021, 2:13pm UTC](https://mne.discourse.group/t/how-to-add-channels-not-present-on-digmontage-for-reference/4007 "2021-11-23T14:13:28Z")
Hello! During my data recording with the 64ch BioSemi system, I used 2 extra electrodes in the mastoids. Now I want to re-reference my data with those 2 channels. I checked that the standard montage for this cap on mn… --- ## [Drop channels after bipolar reference](https://mne.discourse.group/t/drop-channels-after-bipolar-reference/3469)
**Author:** [@BarryLiu97](https://mne.discourse.group/u/BarryLiu97)\ **Replies:** 16\ **Last updated:** [October 12, 2021, 12:04pm UTC](https://mne.discourse.group/t/drop-channels-after-bipolar-reference/3469 "2021-10-12T12:04:52Z")
Hi, I have a technical problem. I was analyzing SEEG. Normally, we should drop channels out of the brain. After doing bipolar reference, the signal doesn’t simply present the original channel. Like the signal of A2 becom… --- ## [Combining Channels via a subtraction method.](https://mne.discourse.group/t/combining-channels-via-a-subtraction-method/3605)
**Author:** [@julesneuro](https://mne.discourse.group/u/julesneuro)\ **Replies:** 4\ **Last updated:** [September 1, 2021, 7:15am UTC](https://mne.discourse.group/t/combining-channels-via-a-subtraction-method/3605 "2021-09-01T07:15:50Z")
MNE-Python version: 0.23.0 For BioSemi EEG systems you have to re-reference the EEG signal via subtracting one mastoid channel “EXG5” from the other “EXG6”. I intend to do this via the mne.channels.combine\_channels fun…