# \#fnirs **URL:** https://mne.discourse.group/tag/fnirs/32.md [Latest](https://mne.discourse.group/latest.md) · [Categories](https://mne.discourse.group/categories.md) · [Tags](https://mne.discourse.group/tags.md) --- ## [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… --- ## [fNIRS hyperscanning PCA regression](https://mne.discourse.group/t/fnirs-hyperscanning-pca-regression/11691)
**Author:** [@almph](https://mne.discourse.group/u/almph)\ **Replies:** 0\ **Last updated:** [February 11, 2026, 11:01am UTC](https://mne.discourse.group/t/fnirs-hyperscanning-pca-regression/11691 "2026-02-11T11:01:19Z")
Dear support team, I was wondering whether it would be possible to use PCA artifact regression from the EEG/EOG module on fNIRS hyperscanning data. Since we have a natural paradigm involving free interaction we cannot w… --- ## [Set up reject criteria in fNIRs preprocessing](https://mne.discourse.group/t/set-up-reject-criteria-in-fnirs-preprocessing/7151)
**Author:** [@DGao](https://mne.discourse.group/u/DGao)\ **Replies:** 2\ **Last updated:** [February 6, 2026, 12:07pm UTC](https://mne.discourse.group/t/set-up-reject-criteria-in-fnirs-preprocessing/7151 "2026-02-06T12:07:07Z")
Hello, I have a question of using the reject\_criteria in fNIRs preprocessing. The MNE documentation says reject\_criteria = dict(hbo=80e-6) sets the maximum acceptable peak-to-peak amplitudes for each channel type in … --- ## [FNIRS preprocessing based on Lab Streaming Layer](https://mne.discourse.group/t/fnirs-preprocessing-based-on-lab-streaming-layer/11669)
**Author:** [@sotod](https://mne.discourse.group/u/sotod)\ **Replies:** 1\ **Last updated:** [January 21, 2026, 5:33pm UTC](https://mne.discourse.group/t/fnirs-preprocessing-based-on-lab-streaming-layer/11669 "2026-01-21T17:33:33Z")
Dear MNE-NIRS development team, We are writing to request support for fNIRS data processing pipelines including signal quality assessment when data is collected with Lab Streaming Layer (LSL). LSL provides a standardiz… --- ## [NaN error values - fNIRS Group Averaging](https://mne.discourse.group/t/nan-error-values-fnirs-group-averaging/11644)
**Author:** [@Kahim\_Seb](https://mne.discourse.group/u/Kahim_Seb)\ **Replies:** 2\ **Last updated:** [January 5, 2026, 11:08am UTC](https://mne.discourse.group/t/nan-error-values-fnirs-group-averaging/11644 "2026-01-05T11:08:42Z")
: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: macOS Sequoia 15.5 Hi guys ! I’m trying to reproduce the group averaging r… --- ## [fNIRS optodes location displaying on 3D plots](https://mne.discourse.group/t/fnirs-optodes-location-displaying-on-3d-plots/11580)
**Author:** [@Kahim\_Seb](https://mne.discourse.group/u/Kahim_Seb)\ **Replies:** 1\ **Last updated:** [November 21, 2025, 4:34pm UTC](https://mne.discourse.group/t/fnirs-optodes-location-displaying-on-3d-plots/11580 "2025-11-21T16:34:55Z")
MNE version: 1.2.3 MNE-nirs : 0.7.3 operating system: macOS 15.5 Hello, I’m trying to reproduce the averaging analysis conducted in this article after downloading the dataset : “Luke R, Larson E, Shader MJ, Innes-Br… --- ## [Getting started with fNIRS montage](https://mne.discourse.group/t/getting-started-with-fnirs-montage/3735)
**Author:** [@Michalw](https://mne.discourse.group/u/Michalw)\ **Replies:** 8\ **Last updated:** [October 8, 2025, 3:24pm UTC](https://mne.discourse.group/t/getting-started-with-fnirs-montage/3735 "2025-10-08T15:24:52Z")
Hi, I am new to fnirs and MNE. I want to draw the montage (electrodes layout) in 2D and also in 3D on a head model. I am not sure how to start. Some of the electrodes in the montage correspond to the 10-20 eeg electrode… --- ## [fNIRS: RuntimeError: None must operate on continuous wave data, but none was found.](https://mne.discourse.group/t/fnirs-runtimeerror-none-must-operate-on-continuous-wave-data-but-none-was-found/11462)
**Author:** [@NK221088](https://mne.discourse.group/u/NK221088)\ **Replies:** 3\ **Last updated:** [August 28, 2025, 9:42am UTC](https://mne.discourse.group/t/fnirs-runtimeerror-none-must-operate-on-continuous-wave-data-but-none-was-found/11462 "2025-08-28T09:42:37Z")
MNE version: 1.10.0 Operating system: Windows 11 I have an issue regarding converting my fNIRS raw intensities to optical density. More specifically I receive the error code below: mne.preprocessing.nirs.optical\_densi… --- ## [Convolution of NIRS signal](https://mne.discourse.group/t/convolution-of-nirs-signal/11319)
**Author:** [@Zanchi](https://mne.discourse.group/u/Zanchi)\ **Replies:** 0\ **Last updated:** [June 25, 2025, 1:08pm UTC](https://mne.discourse.group/t/convolution-of-nirs-signal/11319 "2025-06-25T13:08:27Z")
Hi, I am analyzing data related to Freezing of Gait (FoG) episodes in Parkinson’s disease. Based on video recordings, we were able to identify the precise onset and offset times of each FoG event. When I plot the HbO s… --- ## [MNE fNIRS Waveform analysis](https://mne.discourse.group/t/mne-fnirs-waveform-analysis/8970)
**Author:** [@Taina](https://mne.discourse.group/u/Taina)\ **Replies:** 1\ **Last updated:** [June 6, 2025, 1:29pm UTC](https://mne.discourse.group/t/mne-fnirs-waveform-analysis/8970 "2025-06-06T13:29:05Z")
MNE version: MNE Python 3.11.7 operating system: Windows 10 My final analysis had these ugly distorced waveforms: Did anyone get something similar? What might be going wrong? I’m pasting the whole code i’m using b… --- ## [How to set ch\_names using set\_montage and DigMontage of 3x5 (ETG-7000) layout](https://mne.discourse.group/t/how-to-set-ch-names-using-set-montage-and-digmontage-of-3x5-etg-7000-layout/5673)
**Author:** [@rfahrn](https://mne.discourse.group/u/rfahrn)\ **Replies:** 6\ **Last updated:** [May 19, 2025, 11:33pm UTC](https://mne.discourse.group/t/how-to-set-ch-names-using-set-montage-and-digmontage-of-3x5-etg-7000-layout/5673 "2025-05-19T23:33:38Z")
MNE version: dev 1.2. operating system: Windows 10 Hi I used Digmontage in order to create a montage out of a .pos file (positional file). However, I seem to not have named them correctly. I did the following: raw = … --- ## [MNE-NIRS: Saving glm results and managing file size](https://mne.discourse.group/t/mne-nirs-saving-glm-results-and-managing-file-size/11199)
**Author:** [@gustafw](https://mne.discourse.group/u/gustafw)\ **Replies:** 0\ **Last updated:** [May 16, 2025, 11:15am UTC](https://mne.discourse.group/t/mne-nirs-saving-glm-results-and-managing-file-size/11199 "2025-05-16T11:15:47Z")
Hi, I’m new to fNIRS analysis and have been trying out MNE. Because I want to document my analysis steps carefully, I save first-level GLM results using the built-in method for this purpose, following the tutorial at \[S… --- ## [Why PPF and not DPF in mne.preprocessing.nirs.beer\_lambert\_law ?](https://mne.discourse.group/t/why-ppf-and-not-dpf-in-mne-preprocessing-nirs-beer-lambert-law/4373)
**Author:** [@jwunderlich](https://mne.discourse.group/u/jwunderlich)\ **Replies:** 4\ **Last updated:** [April 16, 2025, 9:08pm UTC](https://mne.discourse.group/t/why-ppf-and-not-dpf-in-mne-preprocessing-nirs-beer-lambert-law/4373 "2025-04-16T21:08:51Z")
Hello, I need some help understanding why the function to convert optical density to haemoglobin concentration (ie mne.preprocessing.nirs.beer\_lambert\_law) is using the partial pathlength factor (PPF) rather than differ… --- ## [Custom fNIRS Montage](https://mne.discourse.group/t/custom-fnirs-montage/5667)
**Author:** [@JimKnebel](https://mne.discourse.group/u/JimKnebel)\ **Replies:** 5\ **Last updated:** [March 30, 2025, 5:49am UTC](https://mne.discourse.group/t/custom-fnirs-montage/5667 "2025-03-30T05:49:21Z")
Configuration: Python: 3.10.6 MNE version: e.g. 1.1.1 operating system: Windows 10 For my research I use a Shimadzu Foire-300 and am able to properly create RawArray files. However, I am having issues with creating a … --- ## [Equivalent signal to CBSI using enhance\_negative\_correlation?](https://mne.discourse.group/t/equivalent-signal-to-cbsi-using-enhance-negative-correlation/10988)
**Author:** [@ryssamoffat](https://mne.discourse.group/u/ryssamoffat)\ **Replies:** 1\ **Last updated:** [March 24, 2025, 8:18am UTC](https://mne.discourse.group/t/equivalent-signal-to-cbsi-using-enhance-negative-correlation/10988 "2025-03-24T08:18:02Z")
Recently, more fNIRS research groups seem to performing statistical analyses on CBSI (correlation-based signal improvement) instead of HbO and HbR signals. As far as I understand, the MATLAB process for computing CBSI i… --- ## [How can I differentiate between the cerebral cortex, cranial layer, cerebrospinal fluid, gray matter, and white matter layers using a single fNIRS dataset?](https://mne.discourse.group/t/how-can-i-differentiate-between-the-cerebral-cortex-cranial-layer-cerebrospinal-fluid-gray-matter-and-white-matter-layers-using-a-single-fnirs-dataset/10574)
**Author:** [@xyq](https://mne.discourse.group/u/xyq)\ **Replies:** 0\ **Last updated:** [November 26, 2024, 2:58am UTC](https://mne.discourse.group/t/how-can-i-differentiate-between-the-cerebral-cortex-cranial-layer-cerebrospinal-fluid-gray-matter-and-white-matter-layers-using-a-single-fnirs-dataset/10574 "2024-11-26T02:58:40Z")
Hello everyone, I hope you’re all doing well. I’m trying to distinguish between the cerebral cortex, cranial layer, cerebrospinal fluid, gray matter, and white matter layers using a single fNIRS dataset. Specifically, w… --- ## [Mean Square Error and Standard Error the Same for All Channels](https://mne.discourse.group/t/mean-square-error-and-standard-error-the-same-for-all-channels/10542)
**Author:** [@pgk713](https://mne.discourse.group/u/pgk713)\ **Replies:** 0\ **Last updated:** [November 16, 2024, 2:17am UTC](https://mne.discourse.group/t/mean-square-error-and-standard-error-the-same-for-all-channels/10542 "2024-11-16T02:17:20Z")
Hey Everyone, I have been doing individual level (glm) and group level (LMM) analysis on my FNIRS data to see group level activations for a block design task. I am running into a problem in which for the the individual … --- ## [fNIRS Functional Connectivity Analysis](https://mne.discourse.group/t/fnirs-functional-connectivity-analysis/10536)
**Author:** [@pgk713](https://mne.discourse.group/u/pgk713)\ **Replies:** 3\ **Last updated:** [November 16, 2024, 12:31am UTC](https://mne.discourse.group/t/fnirs-functional-connectivity-analysis/10536 "2024-11-16T00:31:55Z")
Has anyone be able to come up with or come across a functional connectivity analysis for fNIRS using MNE ? If so i would love to see your code to see how this is done! Any links to a github or associated code sharing web… --- ## [MNE VS NIRS Toolbox](https://mne.discourse.group/t/mne-vs-nirs-toolbox/10534)
**Author:** [@pgk713](https://mne.discourse.group/u/pgk713)\ **Replies:** 0\ **Last updated:** [November 14, 2024, 11:54pm UTC](https://mne.discourse.group/t/mne-vs-nirs-toolbox/10534 "2024-11-14T23:54:59Z")
Hey everyone, I am trying to replicate my FNIRS analysis that i have done in MNE in NIRS toolbox to ensure that I am getting similar results across the two data processing programs and I am getting radically different r… --- ## [How to Visualize fNIRS Data on the Brain Surface and Display Temporal Changes Using mne.viz.plot\_source\_estimates?](https://mne.discourse.group/t/how-to-visualize-fnirs-data-on-the-brain-surface-and-display-temporal-changes-using-mne-viz-plot-source-estimates/10513)
**Author:** [@xyq](https://mne.discourse.group/u/xyq)\ **Replies:** 2\ **Last updated:** [November 14, 2024, 11:59am UTC](https://mne.discourse.group/t/how-to-visualize-fnirs-data-on-the-brain-surface-and-display-temporal-changes-using-mne-viz-plot-source-estimates/10513 "2024-11-14T11:59:44Z")
Hello everyone, I’m trying to visualize fNIRS data on the brain surface and display how the data changes over time. I attempted to use the MNE function mne\_nirs.visualisation.plot\_glm\_surface\_projection, but I found tha… --- ## [How to avoid epoch loss in fNIRS data processing](https://mne.discourse.group/t/how-to-avoid-epoch-loss-in-fnirs-data-processing/10522)
**Author:** [@FLF](https://mne.discourse.group/u/FLF)\ **Replies:** 6\ **Last updated:** [November 13, 2024, 1:48pm UTC](https://mne.discourse.group/t/how-to-avoid-epoch-loss-in-fnirs-data-processing/10522 "2024-11-13T13:48:10Z")
Hello everyone， operating system: Windows 10 I have a question regarding MNE version 1.6.1. When I use mne.Epochs(reject=None, preload=False)in fNIRS data processing,some epochs are lost. Could you please advise on h… --- ## [How to address sampling rate problem?](https://mne.discourse.group/t/how-to-address-sampling-rate-problem/10501)
**Author:** [@ansleykunnath](https://mne.discourse.group/u/ansleykunnath)\ **Replies:** 3\ **Last updated:** [November 8, 2024, 9:58pm UTC](https://mne.discourse.group/t/how-to-address-sampling-rate-problem/10501 "2024-11-08T21:58:54Z")
I use a NIRx NIRScout fNIRS recording system with 26 LED sources and 27 detectors. During one of our data collection sessions, we forgot to select “bilateral” in the NIRStar set-up menu, and subsequently the data was col… --- ## [How to save the movie](https://mne.discourse.group/t/how-to-save-the-movie/8148)
**Author:** [@wxwwnyzjwx](https://mne.discourse.group/u/wxwwnyzjwx)\ **Replies:** 5\ **Last updated:** [November 4, 2024, 4:17am UTC](https://mne.discourse.group/t/how-to-save-the-movie/8148 "2024-11-04T04:17:33Z")
MNE version:0.22.0 operating system: Windows 10 Hello! I am new with fnirs, and I hope someone kind could help me. I want to project the blood oxygen onto the model and save it as movie, also showing the optrodes and d… --- ## [Are the locations from the fNIRS data transformable to the EEG analysis?](https://mne.discourse.group/t/are-the-locations-from-the-fnirs-data-transformable-to-the-eeg-analysis/10425)
**Author:** [@SMMB](https://mne.discourse.group/u/SMMB)\ **Replies:** 0\ **Last updated:** [October 20, 2024, 2:40pm UTC](https://mne.discourse.group/t/are-the-locations-from-the-fnirs-data-transformable-to-the-eeg-analysis/10425 "2024-10-20T14:40:08Z")
Assuming that we have simultaneously recorded EEG-fNIRS signals, and we do not know about the montage, are the locations gained from the fNIRS data transformable to be used in the EEG analysis? Do they both have the same… --- ## [Help about mne beer lambert law](https://mne.discourse.group/t/help-about-mne-beer-lambert-law/10399)
**Author:** [@yslbit](https://mne.discourse.group/u/yslbit)\ **Replies:** 0\ **Last updated:** [October 16, 2024, 7:39am UTC](https://mne.discourse.group/t/help-about-mne-beer-lambert-law/10399 "2024-10-16T07:39:18Z")
Hello: I am currently studying functional near-infrared spectroscopy (fNIRS) data and have noticed that MNE uses the modified Beer-Lambert Law in its computations. I have a couple of questions I hope someone could help … --- ## [Beer Lamber Law scaling](https://mne.discourse.group/t/beer-lamber-law-scaling/8910)
**Author:** [@Gautam-Bala](https://mne.discourse.group/u/Gautam-Bala)\ **Replies:** 1\ **Last updated:** [October 12, 2024, 1:18am UTC](https://mne.discourse.group/t/beer-lamber-law-scaling/8910 "2024-10-12T01:18:09Z")
Hi All, Can someone suggest on what basis a scaling factor of 1e-3 is applied to Beer Lambert Law calculations in MNE and would it differ for infants? Reference: Line 76: raw.\_data\[\[ii, jj\]\] = iEL @ raw.\_data\[\[ii, jj\]… --- ## [Infant optodes arrangement visualization](https://mne.discourse.group/t/infant-optodes-arrangement-visualization/10375)
**Author:** [@Mellon](https://mne.discourse.group/u/Mellon)\ **Replies:** 0\ **Last updated:** [October 11, 2024, 7:01am UTC](https://mne.discourse.group/t/infant-optodes-arrangement-visualization/10375 "2024-10-11T07:01:12Z")
MNE version: 1.5.0 MNE NIRS version: 0.6.0 operating system: Windows 11 Enterprise Hello everyone, I’d like to plot my optodes arrangement for my 6-month-old infants data. I’ve been doing it already for adults using t… --- ## [fNIRS Custom Montage](https://mne.discourse.group/t/fnirs-custom-montage/10373)
**Author:** [@jeffrymahbuubi](https://mne.discourse.group/u/jeffrymahbuubi)\ **Replies:** 1\ **Last updated:** [October 11, 2024, 4:20am UTC](https://mne.discourse.group/t/fnirs-custom-montage/10373 "2024-10-11T04:20:39Z")
MNE version: 1.8.0 operating system: Windows 11 Hello, I have fNIRS data where the source and detector locations follow the brainproducts-RNP-BA-128 montage. I would like to use this montage configuration with the pro… --- ## [Need help on fNIRS device](https://mne.discourse.group/t/need-help-on-fnirs-device/9342)
**Author:** [@sovnlos](https://mne.discourse.group/u/sovnlos)\ **Replies:** 0\ **Last updated:** [September 21, 2024, 11:03am UTC](https://mne.discourse.group/t/need-help-on-fnirs-device/9342 "2024-09-21T11:03:50Z")
Dear all and @rob-luke, I am in need of advice for my PhD research, I would like to purchase the following fNIRS device, which the company provides data sheet about sensor. While my basic understanding suggests that the… --- ## [How to add digitised optode positions/channels to fNIRS data (cortivision)](https://mne.discourse.group/t/how-to-add-digitised-optode-positions-channels-to-fnirs-data-cortivision/7758)
**Author:** [@ryssamoffat](https://mne.discourse.group/u/ryssamoffat)\ **Replies:** 2\ **Last updated:** [September 16, 2024, 4:55pm UTC](https://mne.discourse.group/t/how-to-add-digitised-optode-positions-channels-to-fnirs-data-cortivision/7758 "2024-09-16T16:55:23Z")
MNE version: 1.5.1 operating system: e.g. macOS 13.4.1 I am using a Cortivision fNIRS device to record data and a Structure Sensor Pro to record 3D coordinates of optodes. I would like to know how I can most easily rea… [Next page](https://mne.discourse.group/tag/fnirs/32.md?match_all_tags=true&page=1&tags%5B%5D=fnirs)