[FieldTrip] fieldtrip Digest, Vol 183, Issue 6

Richards, John RICHARDS at mailbox.sc.edu
Thu Feb 19 18:48:56 CET 2026 

We do this a lot.  We put the eyeball (orbit) in the head model, specifically the T2w eye area, and give it the same conductivity as CSF.  Some of our studies use ICA and identify components which have a dipole or current in the eye location, and in others where the ICA activity moves at eye movement onset.  The component may then be removed from the group of ICA used to reconstruct the EEG; i.e., EEG without EM activity.



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Sent: Thursday, February 19, 2026 6:00 AM
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Subject: fieldtrip Digest, Vol 183, Issue 6

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Today's Topics:

   1. Re: EEG Leadfield computation for eyeballs (Sarang S. Dalal)
   2. Re: EEG Leadfield computation for eyeballs (René Skukies)
   3. Re: EEG Leadfield computation for eyeballs
      (Schoffelen, J.M. (Jan Mathijs))
   4. Re: EEG Leadfield computation for eyeballs (Carsten Wolters)


----------------------------------------------------------------------

Message: 1
Date: Wed, 18 Feb 2026 12:04:49 +0000
From: "Sarang S. Dalal" <sarang at cfin.au.dk>
To: "fieldtrip at science.ru.nl" <fieldtrip at science.ru.nl>
Subject: Re: [FieldTrip] EEG Leadfield computation for eyeballs
Message-ID:
        <AM9PR01MB7428B35C9064D9A1CF6ABF9BEB6AA at AM9PR01MB7428.eurprd01.prod.exchangelabs.com>

Content-Type: text/plain; charset="utf-8"

Dear Thomas,

I haven't tried it myself yet, but check out the HArtMuT model:
 https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hartmut.berlin%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735198340%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ruXQt57YeUZA3wOn%2FnJTb7e9JdCjBPuuuPnGgFYGFgs%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhartmut.neuro.tu-berlin.de%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735211638%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=AI7LcaGdXHHU5%2BklpLEocpXsx7qA1UEp3GEwTI%2F3B5A%3D&reserved=0>

And associated paper:
https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdoi.org%2F10.1088%2F1741-2552%2Faca8ce&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735225037%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=xLPJr8kLs04rtGOrwqn%2FE5LN6wK3ETHsC4o9GEW1gao%3D&reserved=0

I'm not sure if it's ready to use with FieldTrip (or EEGLAB) out of the box yet, but maybe with some further hacking/development.

There's probably not much else with available code, but there's several other papers about modelling the oculogram or retinogram, e.g.:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1109%2F10.552251&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735238298%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=qeOhYGw7%2Fq4Hl09cU%2FGBIYC5hWh4hOEGpJjrrFNZ4kM%3D&reserved=0
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fieeexplore.ieee.org%2Fdocument%2F8856323&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735251930%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=JRSetqJgiwgi4FfauohM5eSmrHiljOe5kndP8gQgCOE%3D&reserved=0

Depending on what your goal is, I wonder if it might be simpler to 'empirically' determine the ocular lead field with intentional eye movements. Happy to discuss that offline if you like!

Cheers,
Sarang
________________________________
From: fieldtrip <fieldtrip-bounces at science.ru.nl> on behalf of Thomas Koenig via fieldtrip <fieldtrip at science.ru.nl>
Sent: Wednesday 18 February 2026 09:59
To: fieldtrip at science.ru.nl <fieldtrip at science.ru.nl>
Cc: thomas.koenig at unibe.ch <thomas.koenig at unibe.ch>
Subject: [FieldTrip] EEG Leadfield computation for eyeballs


Dear colleagues,



I am looking for a way to compute an EEG lead-field matrix for two single dipoles at the centers of the eyeballs. Has anybody worked on or ideally solved this problem?



Thanks, Thomas





Prof. Dr. Thomas Koenig

Translational Research Center

University Hospital of Psychiatry and Psychotherapy

Bolligenstrasse 111

3000 Bern 60


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------------------------------

Message: 2
Date: Wed, 18 Feb 2026 14:07:25 +0100
From: René Skukies <science at reneskukies.de>
To: fieldtrip at science.ru.nl
Cc: Judith Schepers <Judith.Schepers at vis.uni-stuttgart.de>, "Benedikt
        V. Ehinger" <benedikt.ehinger at vis.uni-stuttgart.de>,
        thomas.koenig at unibe.ch
Subject: Re: [FieldTrip] EEG Leadfield computation for eyeballs
Message-ID: <f06c224b-4086-4b5a-8cc4-d37d81c9dc6d at reneskukies.de>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Dear Thomas,


there was a master student in our Group last year (under the supervision of Benedikt Ehinger & Judith Schepers, in CC) that worked on the topic.


She used the HArtMuT model mentioned by Saran to implement ocular
artifacts in EEG simulations. You can find her thesis + code here:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fs-ccs%2F2024-ocular-artifacts-simulation%2Ftree%2Fmain&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735293100%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=xpTWkFISMToA558nI4SGyXIL%2FJDyEYLg84N96G5YS%2Bg%3D&reserved=0


The work she did also led to an addition to our simulation toolbox (in
Julia), but for now it's still an open PR:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Funfoldtoolbox%2FUnfoldSim.jl%2Fpull%2F165&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735306953%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=wP%2BRnskamkOpESatb9FWhx%2FXqbT9HWbjbn98r%2BYinzE%3D&reserved=0


I am sure you can also write Judith or Bene to discuss this more.


Cheers,

René


On 2/18/2026 1:04 PM, Sarang S. Dalal via fieldtrip wrote:
> Dear Thomas,
>
> I haven't tried it myself yet, but check out the HArtMuT model:
> _https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hartmut.berlin%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735320855%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=BYyrcHLPOXn9SIu0eewffXBgl%2FFuxsu4xIQw8wGjfyY%3D&reserved=0
> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhartmut.neuro.tu-berlin.de%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735334790%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=MeSB7cXNdNsSlpWytpSY%2B41jeYY8eS7Oc6tJbT%2Foq%2BE%3D&reserved=0>_
>
> And associated paper:
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdoi.org%2F10.1088%2F1741-2552%2Faca8ce&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735349065%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=kn2EVWywATwsg3WqCgT70jds3u8fzzhd9R4rI8v%2FVN8%3D&reserved=0
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdoi.org%2F10.1088%2F1741-2552%2Faca8ce&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735369680%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ZWoIaf0ZvslkVKoGM0yUJo5zdfps1RU83h%2FFd3upT%2F8%3D&reserved=0>
>
> I'm not sure if it's ready to use with FieldTrip (or EEGLAB) out of
> the box yet, but maybe with some further hacking/development.
>
> There's probably not much else with available code, but there's
> several other papers about modelling the oculogram or retinogram, e.g.:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1109%2F10.552251&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735385373%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=8wboxHTtnZrm4zpJOA8n7uaUVV0ULf1hH1O9dbR14Ws%3D&reserved=0
> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1109%2F10.552251&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735398938%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=3vY0OBFfqoKS4viIIFzBD8YpSqVBZA8YNWd2pJtm7jA%3D&reserved=0>
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fieeexplore.ieee.org%2Fdocument%2F8856323&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735412037%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=VllHBm3tixMp9Ps8%2FRx%2BNGnsWrD9tAfJa5lpIuBek8Q%3D&reserved=0
> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fieeexplore.ieee.org%2Fdocument%2F8856323&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735428886%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=giBROC6SPeQfRmzMkV4lYNvNthVObrWhO4Vdw%2BqzAb8%3D&reserved=0>
>
> Depending on what your goal is, I wonder if it might be simpler to
> 'empirically' determine the ocular lead field with intentional eye
> movements. Happy to discuss that offline if you like!
>
> Cheers,
> Sarang
> ------------------------------------------------------------------------
> *From:* fieldtrip <fieldtrip-bounces at science.ru.nl> on behalf of
> Thomas Koenig via fieldtrip <fieldtrip at science.ru.nl>
> *Sent:* Wednesday 18 February 2026 09:59
> *To:* fieldtrip at science.ru.nl <fieldtrip at science.ru.nl>
> *Cc:* thomas.koenig at unibe.ch <thomas.koenig at unibe.ch>
> *Subject:* [FieldTrip] EEG Leadfield computation for eyeballs
>
> Dear colleagues,
>
> I am looking for a way to compute an EEG lead-field matrix for two
> single dipoles at the centers of the eyeballs. Has anybody worked on
> or ideally solved this problem?
>
> Thanks, Thomas
>
> Prof. Dr. Thomas Koenig
>
> Translational Research Center
>
> University Hospital of Psychiatry and Psychotherapy
>
> Bolligenstrasse 111
>
> 3000 Bern 60
>
>
> _______________________________________________
> fieldtrip mailing list
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------------------------------

Message: 3
Date: Wed, 18 Feb 2026 13:53:06 +0000
From: "Schoffelen, J.M. (Jan Mathijs)"
        <janmathijs.schoffelen at donders.ru.nl>
To: FieldTrip discussion list <fieldtrip at science.ru.nl>
Subject: Re: [FieldTrip] EEG Leadfield computation for eyeballs
Message-ID: <CE0D4EC3-58B9-4C49-8CED-2EFB79EDFDD4 at donders.ru.nl>
Content-Type: text/plain; charset="utf-8"

Hi all,

The Hartmut folks actually have an open (work-in-progress) pull request on the fieldtrip github: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ffieldtrip%2Ffieldtrip%2Fpull%2F2253&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735483721%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=GG8PFzf3hcE7NDfsmjGtdlWatLDrUaOek%2BXZqJsOFO4%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ffieldtrip%2Ffieldtrip%2Fpull%2F2253&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735497257%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=TT%2FCan0JRWIEVLscV1zysFLuh96yLauf%2FnjZiQmy8%2F4%3D&reserved=0>. Please feel free to work on this so that we can merge it with the code base. Progress has stalled a bit at this front.

Thus, much of the 'simple' machinery that is in place in order to create forward models for equivalent current dipoles is already at your disposal in FieldTrip. With an appropriate volume conduction model it should be relatively straightforward to place 2 dipoles at the location of the eyballs, and model the field/potential distribution.

Best wishes,
Jan-Mathijs




On 18 Feb 2026, at 14:07, René Skukies via fieldtrip <fieldtrip at science.ru.nl> wrote:

Dear Thomas,

there was a master student in our Group last year (under the supervision of Benedikt Ehinger & Judith Schepers, in CC) that worked on the topic.

She used the HArtMuT model mentioned by Saran to implement ocular artifacts in EEG simulations. You can find her thesis + code here: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fs-ccs%2F2024-ocular-artifacts-simulation%2Ftree%2Fmain&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735510707%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=n%2FXHTralCk1DvFwN4L1FveQF6TLr7nEXA3JEq0SPeB0%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fs-ccs%2F2024-ocular-artifacts-simulation%2Ftree%2Fmain&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735523931%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=TQVPNmfhiBWw%2FO2o2pkAoOkewi9%2BbQzGX8u8r7FrVoE%3D&reserved=0>

The work she did also led to an addition to our simulation toolbox (in Julia), but for now it's still an open PR: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Funfoldtoolbox%2FUnfoldSim.jl%2Fpull%2F165&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735537040%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=siGxhTiZBYCDc5%2BlQM8xGgfUChvzfhCu3ymxFicLy5c%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Funfoldtoolbox%2FUnfoldSim.jl%2Fpull%2F165&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735560046%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=nTWWWzFP%2F3IbjGHAxrilrfIaWGo%2Bwv4o%2FSS%2B2NlanXo%3D&reserved=0>

I am sure you can also write Judith or Bene to discuss this more.

Cheers,
René

On 2/18/2026 1:04 PM, Sarang S. Dalal via fieldtrip wrote:
Dear Thomas,

I haven't tried it myself yet, but check out the HArtMuT model:
 https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hartmut.berlin%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735574787%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=uH1x33x1Brf9cJZaFzg5yRkn04bW1mOsDBEb%2B08wwFE%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhartmut.neuro.tu-berlin.de%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735595205%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=T1W%2FHO%2FBxJq3lX88HXL8wo9rs%2BPNe%2BPn%2Fd0wiQU6XKA%3D&reserved=0>

And associated paper:
https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdoi.org%2F10.1088%2F1741-2552%2Faca8ce&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735610583%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=zv%2Fr%2BHfB3BMvAKDwsRq3BBBQAJKQ6lhziI6GbcWTFao%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdoi.org%2F10.1088%2F1741-2552%2Faca8ce&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735625556%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sL2%2B%2BlHvoYnM9xA78flFdHY%2BSX0Gawbw82AUPkLOT5Y%3D&reserved=0>

I'm not sure if it's ready to use with FieldTrip (or EEGLAB) out of the box yet, but maybe with some further hacking/development.

There's probably not much else with available code, but there's several other papers about modelling the oculogram or retinogram, e.g.:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1109%2F10.552251&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735640822%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=gM1ojqngEPzY%2FfUDY9oYhjNKDaNHDHOKBdQiME%2BPe%2BQ%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1109%2F10.552251&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735654324%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=8YtQ0BkHUMWAEPWwF%2BN2b8cUAb3qsV7z%2BT%2F5L0WGvpQ%3D&reserved=0>
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fieeexplore.ieee.org%2Fdocument%2F8856323&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735667459%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=UT98uRvrPCdsMzvqVzlM%2F3xo32WcfkdlG7raA9N1kCg%3D&reserved=0<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fieeexplore.ieee.org%2Fdocument%2F8856323&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735681180%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=1Z7b2Xdeol9e58k2NZeRgYaaH7c8OabXhWu5Eukyuqs%3D&reserved=0>

Depending on what your goal is, I wonder if it might be simpler to 'empirically' determine the ocular lead field with intentional eye movements. Happy to discuss that offline if you like!

Cheers,
Sarang
________________________________
From: fieldtrip <fieldtrip-bounces at science.ru.nl><mailto:fieldtrip-bounces at science.ru.nl> on behalf of Thomas Koenig via fieldtrip <fieldtrip at science.ru.nl><mailto:fieldtrip at science.ru.nl>
Sent: Wednesday 18 February 2026 09:59
To: fieldtrip at science.ru.nl<mailto:fieldtrip at science.ru.nl> <fieldtrip at science.ru.nl><mailto:fieldtrip at science.ru.nl>
Cc: thomas.koenig at unibe.ch<mailto:thomas.koenig at unibe.ch> <thomas.koenig at unibe.ch><mailto:thomas.koenig at unibe.ch>
Subject: [FieldTrip] EEG Leadfield computation for eyeballs

Dear colleagues,



I am looking for a way to compute an EEG lead-field matrix for two single dipoles at the centers of the eyeballs. Has anybody worked on or ideally solved this problem?



Thanks, Thomas





Prof. Dr. Thomas Koenig
Translational Research Center
University Hospital of Psychiatry and Psychotherapy
Bolligenstrasse 111
3000 Bern 60




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Message: 4
Date: Thu, 19 Feb 2026 11:29:55 +0100
From: "Carsten Wolters" <carsten.wolters at uni-muenster.de>
To: "'FieldTrip discussion list'" <fieldtrip at science.ru.nl>
Cc: <thomas.koenig at unibe.ch>, Malte Höltershinken
        <m_hoel20 at uni-muenster.de>
Subject: Re: [FieldTrip] EEG Leadfield computation for eyeballs
Message-ID: <045001dca18a$b1062140$131263c0$@uni-muenster.de>
Content-Type: text/plain; charset="utf-8"

Dear Thomas,



we have not yet extended our source space into the retina, so have not yet really done it ourselves, but it should principally work with DUNEuro

https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.medizin.uni-muenster.de%2Fduneuro%2Fstartseite.html&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735823872%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=W6riODnh%2F1duXLy6jKK2Rmytzl9iBtXeXbew4MA1kQo%3D&reserved=0

https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjournals.plos.org%2Fplosone%2Farticle%3Fid%3D10.1371%2Fjournal.pone.0252431&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735837975%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=tf8f%2FTs4DwQ3jyU1XGopCyLT%2FrGnlbTyCN%2BQdQZP8KQ%3D&reserved=0

if you make sure that the head model and source space contain the retina

and sufficient grey matter thickness and/or high enough FEM resolution of the retina.



As the source might additionally then be close to the sensors, the source model might have special importance, check e.g.

https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fepubs.siam.org%2Fdoi%2F10.1137%2F23M1582874&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735851540%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=GBZC0qDo9BoJeMANLxpzUEZws%2BE8SuBxQLptaH3tIfA%3D&reserved=0



Best regards

     Carsten Wolters

===========================

Prof. Dr.rer.nat. Carsten Wolters

Universität Münster

Institut für Biomagnetismus und Biosignalanalyse

Malmedyweg 15

48149 Münster

Tel.: +49 251 83 56904

Email:  <mailto:carsten.wolters at uni-muenster.de> carsten.wolters at uni-muenster.de

Web: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.medizin.uni-muenster.de%2Fbiomag%2Fdas-institut%2Fmitarbeiter%2Fcarsten-wolters.html&data=05%7C02%7Cfieldtrip%40science.ru.nl%7Cfe7b2ae24d414404c65f08de6fdf3aa2%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639071201735865470%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=agGyu6GHE1KTyaA7pylMKMxQGVPgz0vR6PIcojWumko%3D&reserved=0







Von: fieldtrip <fieldtrip-bounces at science.ru.nl> Im Auftrag von Thomas Koenig via fieldtrip
Gesendet: Mittwoch, 18. Februar 2026 10:00
An: fieldtrip at science.ru.nl
Cc: thomas.koenig at unibe.ch
Betreff: [FieldTrip] EEG Leadfield computation for eyeballs



Dear colleagues,



I am looking for a way to compute an EEG lead-field matrix for two single dipoles at the centers of the eyeballs. Has anybody worked on or ideally solved this problem?



Thanks, Thomas





Prof. Dr. Thomas Koenig

Translational Research Center

University Hospital of Psychiatry and Psychotherapy

Bolligenstrasse 111

3000 Bern 60



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