Open-source event-related pupillometry using PupilEXT
Gábor László Bényei, Diederick Christian Niehorster, Marcus Nyström, Péter Pajkossy · 2026
In this study we compared the latencies and amplitudes of pupillary light responses, recorded by a Tobii Pro Spark eye-tracker and a setup combining PupilEXT, a free open-source software for pupillometry, with an industrial camera. Pupil size was recorded simultaneously with both systems while illumination was provided by the Spark. Results show that neither pupillary response latencies nor amplitudes differ systematically between the two, supporting the claim that PupilEXT can be used in event-related pupillometry.