Vierailuluento: Dr. Julien Gori, LRI Paris "A new take on the speed-accuracy tradeoff: Implications and Applications for HCI"

A new take on the speed-accuracy tradeoff: Implications and Applications for HCI

Dr Julien Gori
LRI France

Abstract:

A movement requiring higher precision will take more time to complete. This so-called speed-accuracy tradeoff, described in experimental psychology by Fitts' law, is exploited in Human-Computer Interaction (HCI) to evaluate the performance of pointing devices, pointing techniques, and the performance of various atypical populations. However, Fitts' law is empirical and only considers movement endpoint, not trajectories -- it is thus faced with many open questions. Additionally, the current viewpoint unnecessarily limits the scope of the studies of aimed movements. I will first present a new take on the speed-accuracy tradeoff, developed during my thesis, by discussing a stochastic model for aimed movements that describes a set of trajectories. Using a well-known information-theoretic scheme, I will show that the rate at which the trajectories "reach" the target is exponential in time. Some resulting implications for the evaluation of pointing devices and techniques in HCI are explained. I will then discuss some prospects that this work brings for pointing.

Short bio:

Dr Julien Gori is a Post-doctoral fellow at LRI (France). His research focuses on models of human performance, as well as the evaluation of input techniques and input devices in HCI. After graduating from ENS Cachan (France) in electrical engineering, he completed his PhD in computer science at Telecom Paris (France) in 2018.