[FieldTrip] EEG Leadfield computation for eyeballs

[René Skukies]

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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131194063%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=3n82%2Fdmg6hyrYM0uUsCcAyMQdTCq6fiOPdUugeVkYSU%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131246865%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=pJF7xBg3krvlqaaPgN4N1oeM0EhD8IIgs%2BQB7oC0dtA%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131289003%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=ub8mQrGkgPwjVo%2BFik4mRx%2Bd0kARS5EaDX0ia0SHj6Y%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131319561%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=vCM2K3H3zuLl09MRukgo%2FW4cgOq5b4Yka2W%2Bfie4BhM%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131347262%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=msQaP4QA%2BJhoJ23spbKDFkrtV3udcllLGlox2%2F4C60s%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131376463%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=mZoeyDQGJgvlrpDhugGz9vTNAvVPd%2BcE0jb6hJ2uKUU%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131416284%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=kuuj0Q3wZJhRBE8oaVL3%2BigN38lGMhIQTJ7xjn6ifvI%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131455371%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=mOcdwTvYTHK4egWS2JvDMeqkLim5qeSBFvy184chV8w%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131484454%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=c1Bs1X0jxR36%2Fkc1EcTFHkHE7bAuBhraTpp0n4XC18Q%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%7C4c9df2a2e8f44bc4558608de6eeeab0c%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639070169131519759%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=7SiuYjMGQvQ%2B11y5NQVqShYPc8VliiarCd1I2jQ4cdQ%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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