SigmundAI.eu can now implement complete psychological experiments in #OpenSesame. From scratch based on verbal description. Astonishing how far #AI has come 😵‍💫 #psychology

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— Sebastiaan Mathôt (@cogsci.nl) Feb 23, 2026 at 3:56 PM

OpenSesame

OpenSesame is a program to create experiments for psychology, neuroscience, and experimental economics. The latest stable version is 4.1 Neonatal Nightingale (release notes).

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Features

A user-friendly interface — a modern, professional, and easy-to-use graphical interface
Online experiments — run your experiment in a browser with OSWeb
Python — add the power of Python to your experiment
JavaScript — add the power of JavaScript to your experiment
Use your devices — use your eye tracker, button box, EEG equipment, and more.
SigmundAI — build and debug experiments together with an AI expert
Free — released under the GPL3
Crossplatform — Windows, Mac OS, and Linux

Citations

Mathôt, S., Schreij, D., & Theeuwes, J. (2012). OpenSesame: An open-source, graphical experiment builder for the social sciences. Behavior Research Methods, 44(2), 314-324. doi:10.3758/s13428-011-0168-7

Mathôt, S., & March, J. (2022). Conducting linguistic experiments online with OpenSesame and OSWeb. Language Learning. doi:10.1111/lang.12509
Related preprint (not identical to published manuscript)