Talk: Dr. Julien Gori / LRI on Wed Oct 23

Speaker: Dr. Julien Gori / LRI Paris
Title: A new take on the speed-accuracy tradeoff
Time: Oct 23 (Wednesday) at 14-15
Location: TU7, TUAS
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.