Pupil-based lie detection

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Pupil diameter is an indicator of bodily arousal and has been applied to distinguish between true and false statements. Our student Arup Mazumder implemented a yet unexplored approach by providing real-time feedback on pupil size changes while speaking the truth or telling lies. All statements are based on random numbers that appear on the screen and have to be commented by the participant ("higher than five" / "lower than five"). Real-time feedback on pupil diameter is displayed as a circle that is proportionally enlarged and behaves according to the participant's pupil size changes. An assessor evaluates the truthfulness of each message. However, depending on the experimental condition, continuous feedback on pupil diameter is displayed either for the assessor only or for both. Aim of the latter condition is to investigate whether participants are capable of manipulating their bodily arousal (resp. pupil diameter) and pass lies off as truth.

Related publications

Ehlers, J., & Meinecke, A. (2020). Voluntary Pupil Control in Noisy Environments. In ACM Symposium on Eye Tracking Research and Applications (pp. 1-5). https://dl.acm.org/doi/abs/10.1145/3379156.3391358

Ehlers, J., Strauch, C., & Huckauf, A. (2018). Training facilitates cognitive control on pupil dilation. In Proceedings of the 2018 ACM Symposium on Eye Tracking Research & Applications (p. 67). AC. https://dl.acm.org/doi/abs/10.1145/3204493.3204570

Ehlers, J., Georgi, J. & Huckauf, A. (2014). Improving voluntary pupil size changes for HCI. Proceedings of the 8th International Conference on Pervasive Computing Technologies for Healthcare, PervasiveHealth '14 (p. 343-346). Brussels: ICST. doi:10.4108/icst.pervasivehealth.2014.255312. https://dl.acm.org/doi/10.4108/icst.pervasivehealth.2014.255312