# \#preprocessing **URL:** https://mne.discourse.group/tag/preprocessing/29.md [Latest](https://mne.discourse.group/latest.md) · [Categories](https://mne.discourse.group/categories.md) · [Tags](https://mne.discourse.group/tags.md) --- ## [Adding back the original Pz reference channel before PyPREP: should I apply average reference first?](https://mne.discourse.group/t/adding-back-the-original-pz-reference-channel-before-pyprep-should-i-apply-average-reference-first/11957)
**Author:** [@Ananta](https://mne.discourse.group/u/Ananta)\ **Replies:** 2\ **Last updated:** [September 22, 2026, 8:52am UTC](https://mne.discourse.group/t/adding-back-the-original-pz-reference-channel-before-pyprep-should-i-apply-average-reference-first/11957 "2026-09-22T08:52:37Z")
:red\_question\_mark: If you have a question or issue with MNE-Python, please include the following info: MNE version: 1.13.2 PyPrep version: 0.9.0 operating system: Windows 10 Hello everyone, I am working with a publ… --- ## [Unexpected increase in high-frequency power across many EEG channels in raw BioSemi PSD](https://mne.discourse.group/t/unexpected-increase-in-high-frequency-power-across-many-eeg-channels-in-raw-biosemi-psd/11921)
**Author:** [@omertzuk](https://mne.discourse.group/u/omertzuk)\ **Replies:** 2\ **Last updated:** [August 9, 2026, 5:57pm UTC](https://mne.discourse.group/t/unexpected-increase-in-high-frequency-power-across-many-eeg-channels-in-raw-biosemi-psd/11921 "2026-08-09T17:57:56Z")
Hi, I am inspecting the PSD of a raw BioSemi EEG recording before preprocessing. I expected an approximately decreasing 1/f-like spectrum, but many channels instead show increasing power at higher frequencies, particula… --- ## [Should average reference be recomputed after post-ICA channel interpolation?](https://mne.discourse.group/t/should-average-reference-be-recomputed-after-post-ica-channel-interpolation/11905)
**Author:** [@lukas-fv](https://mne.discourse.group/u/lukas-fv)\ **Replies:** 5\ **Last updated:** [August 3, 2026, 6:17am UTC](https://mne.discourse.group/t/should-average-reference-be-recomputed-after-post-ica-channel-interpolation/11905 "2026-08-03T06:17:24Z")
Hi, I am preprocessing BioSemi 128-channel EEG data in MNE-Python for ERP and sensor-level spectral analyses. My pipeline is: Mark bad channels Average-reference excluding bads Fit/apply ICA on the good channels Inte… --- ## [How to treat ocular artifacts for visual tasks](https://mne.discourse.group/t/how-to-treat-ocular-artifacts-for-visual-tasks/11901)
**Author:** [@djn8068](https://mne.discourse.group/u/djn8068)\ **Replies:** 6\ **Last updated:** [July 28, 2026, 2:19pm UTC](https://mne.discourse.group/t/how-to-treat-ocular-artifacts-for-visual-tasks/11901 "2026-07-28T14:19:00Z")
Hello everyone, I have been working on an MNE pipeline for MEG data, and I found something I wasn’t expecting when preprocessing the localizer data: if I removed ocular artifacts during the ICA step, the SNR of the data… --- ## [Pre-processing EEG for Spectral Analysis During Spontaneous Sweating Events](https://mne.discourse.group/t/pre-processing-eeg-for-spectral-analysis-during-spontaneous-sweating-events/11879)
**Author:** [@trnanhkit12](https://mne.discourse.group/u/trnanhkit12)\ **Replies:** 6\ **Last updated:** [July 20, 2026, 7:08am UTC](https://mne.discourse.group/t/pre-processing-eeg-for-spectral-analysis-during-spontaneous-sweating-events/11879 "2026-07-20T07:08:27Z")
Hello everyone, First of all, I’m new to the community but have been using MNE for EEG processing for the past few months. The tool has been fantastic! Anyway, I’m seeking some advice for how to pre-process the 16-chann… --- ## [Advice on preprocessing dual EEG (129 channels)/eye-tracking](https://mne.discourse.group/t/advice-on-preprocessing-dual-eeg-129-channels-eye-tracking/11873)
**Author:** [@Jibok](https://mne.discourse.group/u/Jibok)\ **Replies:** 6\ **Last updated:** [June 30, 2026, 4:25am UTC](https://mne.discourse.group/t/advice-on-preprocessing-dual-eeg-129-channels-eye-tracking/11873 "2026-06-30T04:25:15Z")
Hello! I am fairly new to MNE and wanted to ask for advice on the best course of action for a project broadly looking into how different ERPs are elicited in response to fixations to different video ROIs (eyes, mouth, e… --- ## [Recommended preprocessing pipeline for 32-channel eyes-closed resting EEG before PSD analysis](https://mne.discourse.group/t/recommended-preprocessing-pipeline-for-32-channel-eyes-closed-resting-eeg-before-psd-analysis/11866)
**Author:** [@Vicky\_Kachera](https://mne.discourse.group/u/Vicky_Kachera)\ **Replies:** 11\ **Last updated:** [June 22, 2026, 8:58am UTC](https://mne.discourse.group/t/recommended-preprocessing-pipeline-for-32-channel-eyes-closed-resting-eeg-before-psd-analysis/11866 "2026-06-22T08:58:53Z")
Greetings!, I am working with EEG data recorded from 32 channels (Brain Products) during eyes-closed, guided-meditation (Yoga Nidra) in a supine condition. The dataset includes 12 subjects. For each recording, the begin… --- ## [Interpolating channels marked as 'bad' in the MNE-BIDS-Pipeline](https://mne.discourse.group/t/interpolating-channels-marked-as-bad-in-the-mne-bids-pipeline/11860)
**Author:** [@lightwind](https://mne.discourse.group/u/lightwind)\ **Replies:** 4\ **Last updated:** [June 14, 2026, 11:26am UTC](https://mne.discourse.group/t/interpolating-channels-marked-as-bad-in-the-mne-bids-pipeline/11860 "2026-06-14T11:26:23Z")
Dear community, When preparing my EEG data for analysis with the MNE-BIDS-Pipeline, I mark very noisy or flat channels as ‘bad’, following the recommendations I found on the documentation. However, the pipeline appears … --- ## [Final Call to Join the EEGManyAnalysts Project](https://mne.discourse.group/t/final-call-to-join-the-eegmanyanalysts-project/11859)
**Author:** [@katpa](https://mne.discourse.group/u/katpa)\ **Replies:** 0\ **Last updated:** [June 12, 2026, 8:49am UTC](https://mne.discourse.group/t/final-call-to-join-the-eegmanyanalysts-project/11859 "2026-06-12T08:49:56Z")
Have you ever faced challenges in deciding how best to analyze your EEG data? Have you wondered how to achieve the most replicable results or where to find trusted analytical guidance? The EEGManyAnalysts Project was la… --- ## [Channel interpolation and frequency filtering in MNE-BIDS-Pipeline](https://mne.discourse.group/t/channel-interpolation-and-frequency-filtering-in-mne-bids-pipeline/6583)
**Author:** [@fraenni](https://mne.discourse.group/u/fraenni)\ **Replies:** 3\ **Last updated:** [June 10, 2026, 2:32pm UTC](https://mne.discourse.group/t/channel-interpolation-and-frequency-filtering-in-mne-bids-pipeline/6583 "2026-06-10T14:32:48Z")
Hello, thanks for the new features in the pipeline. I am using the pipeline for ONLY eeg-data I have two general questions: Is it possible to define bad EEG channels and interpolate them in a later state? Is it poss… --- ## [Which way is up after using mne.preprocessing.eyetracking.convert\_units to convert screen coordinates?](https://mne.discourse.group/t/which-way-is-up-after-using-mne-preprocessing-eyetracking-convert-units-to-convert-screen-coordinates/11844)
**Author:** [@Cathaway](https://mne.discourse.group/u/Cathaway)\ **Replies:** 1\ **Last updated:** [May 28, 2026, 3:14pm UTC](https://mne.discourse.group/t/which-way-is-up-after-using-mne-preprocessing-eyetracking-convert-units-to-convert-screen-coordinates/11844 "2026-05-28T15:14:30Z")
We know that EyeLink trackers defaults to setting (0, 0) as the top left corner of screen, with positive Y values referring to areas below it and MNE defaults to using screen centre as (0, 0), but what about the Y-axis … --- ## [How to install only CORE functionality of MNE?](https://mne.discourse.group/t/how-to-install-only-core-functionality-of-mne/11840)
**Author:** [@warptengood](https://mne.discourse.group/u/warptengood)\ **Replies:** 1\ **Last updated:** [May 23, 2026, 4:31pm UTC](https://mne.discourse.group/t/how-to-install-only-core-functionality-of-mne/11840 "2026-05-23T16:31:15Z")
I am using MNE in my light weight pyqt eeg annotation desktop app. I use it to read edf data, do some processing (add low/high frequency filtering), and some channel manipulations like channel relabeling, changing montag… --- ## [How to compute Welch PSD in Source Space after Epoch-level Autoreject](https://mne.discourse.group/t/how-to-compute-welch-psd-in-source-space-after-epoch-level-autoreject/11833)
**Author:** [@junbintian1998](https://mne.discourse.group/u/junbintian1998)\ **Replies:** 3\ **Last updated:** [May 22, 2026, 4:44am UTC](https://mne.discourse.group/t/how-to-compute-welch-psd-in-source-space-after-epoch-level-autoreject/11833 "2026-05-22T04:44:36Z")
Hi MNE Experts, I am processing a resting-state MEG dataset (275 channels) and using autoreject to clean my data after ICA. My goal is to compute Source Space Welch PSD for group-level statistics. However, I’m stuck on … --- ## [1-year Engineer position in Paris for portable eeg and physio devices with LSL](https://mne.discourse.group/t/1-year-engineer-position-in-paris-for-portable-eeg-and-physio-devices-with-lsl/11836)
**Author:** [@kdoelling](https://mne.discourse.group/u/kdoelling)\ **Replies:** 0\ **Last updated:** [May 19, 2026, 10:46am UTC](https://mne.discourse.group/t/1-year-engineer-position-in-paris-for-portable-eeg-and-physio-devices-with-lsl/11836 "2026-05-19T10:46:17Z")
Feel like spending some time in Paris? Have experience with portable eeg systems, eyetrackers and physiological recording devices? Come help a consortium of universities in the Ile-de-France region setup new portable neu… --- ## [OPM-FLUX Toolkit 2026 - Register now!](https://mne.discourse.group/t/opm-flux-toolkit-2026-register-now/11825)
**Author:** [@jenny-anisimova](https://mne.discourse.group/u/jenny-anisimova)\ **Replies:** 0\ **Last updated:** [May 1, 2026, 3:24pm UTC](https://mne.discourse.group/t/opm-flux-toolkit-2026-register-now/11825 "2026-05-01T15:24:46Z")
Dear all, We are delighted to announce that the OPM-FLUX toolkit will be held on the 13th-16th July 2026 at St. Catherine’s College at the University of Oxford! We encourage everyone who is interested in OPM-MEG data an… --- ## [implement eeglab runica informax with mne](https://mne.discourse.group/t/implement-eeglab-runica-informax-with-mne/11815)
**Author:** [@Mokita](https://mne.discourse.group/u/Mokita)\ **Replies:** 1\ **Last updated:** [April 28, 2026, 8:10am UTC](https://mne.discourse.group/t/implement-eeglab-runica-informax-with-mne/11815 "2026-04-28T08:10:43Z")
MNE version: 1.10 operating system: Windows 11 I am working on achieve the runica infomax of eeglab with mne in python. I have calculated the component number using pca cntNumCompForICA, and run EEG = pop\_runica(EEG,‘i… --- ## [No GUI window is displayed when running mne.gui.coregistration().](https://mne.discourse.group/t/no-gui-window-is-displayed-when-running-mne-gui-coregistration/11816)
**Author:** [@Jerry420](https://mne.discourse.group/u/Jerry420)\ **Replies:** 2\ **Last updated:** [April 22, 2026, 7:43am UTC](https://mne.discourse.group/t/no-gui-window-is-displayed-when-running-mne-gui-coregistration/11816 "2026-04-22T07:43:46Z")
MNE version: 1.12.1 operating system: Ubuntu Server 24.04.3 LTS Python version: 3.11.15(also tested following script in version 3.12.3) # %% import mne from mne.datasets import sample print(mne.\_\_version\_\_… --- ## [Claude Skill for MNE!](https://mne.discourse.group/t/claude-skill-for-mne/11804)
**Author:** [@Krish-mal15](https://mne.discourse.group/u/Krish-mal15)\ **Replies:** 0\ **Last updated:** [April 12, 2026, 10:07pm UTC](https://mne.discourse.group/t/claude-skill-for-mne/11804 "2026-04-12T22:07:41Z")
Hi everyone! I’m Krishna and I just built out ClaudeEEG. Essentially, I talked to many neuroscientists with the original goal of understanding their workflows for my learning sake + to see if I could build something in … --- ## [Electrophysiology dev tools](https://mne.discourse.group/t/electrophysiology-dev-tools/11802)
**Author:** [@Krish-mal15](https://mne.discourse.group/u/Krish-mal15)\ **Replies:** 0\ **Last updated:** [April 10, 2026, 9:53pm UTC](https://mne.discourse.group/t/electrophysiology-dev-tools/11802 "2026-04-10T21:53:02Z")
Hey all, I’m Krishna and I am a high school student in California very deep into neurotech! I am an ML engineer at Vistim Labs (neurodegeneration estimation from EEG) and am part-time at UC Davis focusing on spike sortin… --- ## [Automatic EEG quality check & ICA for blink removal in 19-channel dry EEG](https://mne.discourse.group/t/automatic-eeg-quality-check-ica-for-blink-removal-in-19-channel-dry-eeg/11722)
**Author:** [@Ananta](https://mne.discourse.group/u/Ananta)\ **Replies:** 10\ **Last updated:** [April 2, 2026, 6:17am UTC](https://mne.discourse.group/t/automatic-eeg-quality-check-ica-for-blink-removal-in-19-channel-dry-eeg/11722 "2026-04-02T06:17:36Z")
MNE version: e.g. 1.11.0 operating system: e.g. Ubuntu 24.04.1 LTS Hello MNE forum, I am currently preprocessing resting-state EEG data recorded from patients with Parkinson’s disease. Each subject performed a 2-minu… --- ## [Can I set units manually (to dimensionless) when I Z-score my raw data?](https://mne.discourse.group/t/can-i-set-units-manually-to-dimensionless-when-i-z-score-my-raw-data/11791)
**Author:** [@Snore2338](https://mne.discourse.group/u/Snore2338)\ **Replies:** 1\ **Last updated:** [April 1, 2026, 6:03pm UTC](https://mne.discourse.group/t/can-i-set-units-manually-to-dimensionless-when-i-z-score-my-raw-data/11791 "2026-04-01T18:03:10Z")
Some of my sEEG channels have unusually high variance but similar patterns of activity as the other lower-variance channels. An obvious normalization is to Z-score the entire time-course across time to ensure zero mean … --- ## [GSoC 2026 | MNE-Python Intro | Krishnanshu Mittal | Interested in Project 1a (Raw Data Browsing - pyqtgraph)](https://mne.discourse.group/t/gsoc-2026-mne-python-intro-krishnanshu-mittal-interested-in-project-1a-raw-data-browsing-pyqtgraph/11767)
**Author:** [@Clumsy](https://mne.discourse.group/u/Clumsy)\ **Replies:** 0\ **Last updated:** [March 24, 2026, 4:22pm UTC](https://mne.discourse.group/t/gsoc-2026-mne-python-intro-krishnanshu-mittal-interested-in-project-1a-raw-data-browsing-pyqtgraph/11767 "2026-03-24T16:22:59Z")
Hi everyone, I’m Krishnanshu Mittal, a software engineer at Upside Down Labs, where I work on bio-potential signal acquisition hardware and software released as open source. I’m somewhat familiar with open-source workf… --- ## [I built a free, open-source EEG annotation tool that runs on any laptop (Windows/macOS) — no hospital workstation needed](https://mne.discourse.group/t/i-built-a-free-open-source-eeg-annotation-tool-that-runs-on-any-laptop-windows-macos-no-hospital-workstation-needed/11753)
**Author:** [@warptengood](https://mne.discourse.group/u/warptengood)\ **Replies:** 0\ **Last updated:** [March 18, 2026, 6:45am UTC](https://mne.discourse.group/t/i-built-a-free-open-source-eeg-annotation-tool-that-runs-on-any-laptop-windows-macos-no-hospital-workstation-needed/11753 "2026-03-18T06:45:40Z")
I’m a developer working with neurophysiologists, and the main frustration I kept hearing was: “EDF viewers either cost money, require a powerful machine, or are painful to install.” So I built Ziyatron EEG Annotator — a… --- ## [Seeing double (displaying figures twice)](https://mne.discourse.group/t/seeing-double-displaying-figures-twice/11746)
**Author:** [@alice-in-coderland](https://mne.discourse.group/u/alice-in-coderland)\ **Replies:** 2\ **Last updated:** [March 16, 2026, 1:44pm UTC](https://mne.discourse.group/t/seeing-double-displaying-figures-twice/11746 "2026-03-16T13:44:06Z")
MNE version: 1.11.0 MNE-NIRS version: 0.7.3 operating system: macOS Tahoe 26.3 environment: DataSpell 2025.3.2 Hello! I am just starting my adventure with fNIRS and MNE. I wanted to use a similar analysis pipeline for… --- ## [Questions about building a consistent EEG preprocessing pipeline (resting-state)](https://mne.discourse.group/t/questions-about-building-a-consistent-eeg-preprocessing-pipeline-resting-state/11740)
**Author:** [@Ananta](https://mne.discourse.group/u/Ananta)\ **Replies:** 3\ **Last updated:** [March 14, 2026, 6:53pm UTC](https://mne.discourse.group/t/questions-about-building-a-consistent-eeg-preprocessing-pipeline-resting-state/11740 "2026-03-14T18:53:07Z")
:red\_question\_mark: If you have a question or issue with MNE-Python, please include the following info: MNE version: 1.11.0 operating system: Ubuntu 24.04.1 LTS Hello MNE forum, I am currently preprocessing resting-s… --- ## [Invitation to contribute to a collaborative open EEG annotation project (EEG Many Artifacts)](https://mne.discourse.group/t/invitation-to-contribute-to-a-collaborative-open-eeg-annotation-project-eeg-many-artifacts/11728)
**Author:** [@jfrank8](https://mne.discourse.group/u/jfrank8)\ **Replies:** 2\ **Last updated:** [March 13, 2026, 9:23pm UTC](https://mne.discourse.group/t/invitation-to-contribute-to-a-collaborative-open-eeg-annotation-project-eeg-many-artifacts/11728 "2026-03-13T21:23:27Z")
Hello everyone. My name is Gwen Frank, and I wanted to share an opportunity to participate in a new research project aimed at creating a large, openly available resource of expertly annotated EEG data. Contributors will … --- ## [Large peaks in resting state EEG source time course](https://mne.discourse.group/t/large-peaks-in-resting-state-eeg-source-time-course/11712)
**Author:** [@ikarabinas](https://mne.discourse.group/u/ikarabinas)\ **Replies:** 2\ **Last updated:** [March 11, 2026, 4:34pm UTC](https://mne.discourse.group/t/large-peaks-in-resting-state-eeg-source-time-course/11712 "2026-03-11T16:34:27Z")
Dear MNE Users, I am doing source localization with resting state EEG, and have noticed the source time courses in my data often show a few very large peaks. Below is an example of a source estimate and its root mean sq… --- ## [Discussion: Proposed Technical Roadmap for EGI-MFF Modernization (PR #13684)](https://mne.discourse.group/t/discussion-proposed-technical-roadmap-for-egi-mff-modernization-pr-13684/11738)
**Author:** [@PragnyaKhandelwal](https://mne.discourse.group/u/PragnyaKhandelwal)\ **Replies:** 0\ **Last updated:** [March 11, 2026, 1:05pm UTC](https://mne.discourse.group/t/discussion-proposed-technical-roadmap-for-egi-mff-modernization-pr-13684/11738 "2026-03-11T13:05:56Z")
Hi @larsoner and @drammock, Following up on the initial work in PR #13684, I’ve been drafting a potential roadmap to move the EGI-MFF refactor toward a production-ready state. I’m eager to ensure that my proposed approa… --- ## [Muscle artifact detection (annotate\_muscle\_zscore) placement in vMMR preprocessing pipeline](https://mne.discourse.group/t/muscle-artifact-detection-annotate-muscle-zscore-placement-in-vmmr-preprocessing-pipeline/11721)
**Author:** [@omertzuk](https://mne.discourse.group/u/omertzuk)\ **Replies:** 1\ **Last updated:** [March 4, 2026, 11:32am UTC](https://mne.discourse.group/t/muscle-artifact-detection-annotate-muscle-zscore-placement-in-vmmr-preprocessing-pipeline/11721 "2026-03-04T11:32:30Z")
Hello everyone, I’m working on preprocessing an EEG dataset for a visual mismatch response (vMMR) ERP experiment. I have a specific question: where should mne.preprocessing.annotate\_muscle\_zscore() be placed in my epochi… --- ## [find\_delay: A small Python package to find the delay between time series](https://mne.discourse.group/t/find-delay-a-small-python-package-to-find-the-delay-between-time-series/11727)
**Author:** [@rpastureau](https://mne.discourse.group/u/rpastureau)\ **Replies:** 0\ **Last updated:** [March 4, 2026, 11:14am UTC](https://mne.discourse.group/t/find-delay-a-small-python-package-to-find-the-delay-between-time-series/11727 "2026-03-04T11:14:55Z")
Hi! A few years ago, during my PhD, we noticed with colleagues that the audio onset recorded by the MISC channel of our MEG device showed a consistent delay of ~200 ms with the trigger that was sent by Psychtoolbox. As … [Next page](https://mne.discourse.group/tag/preprocessing/29.md?match_all_tags=true&page=1&tags%5B%5D=preprocessing)