title: Fitts' law as a function of system dynamics and target uncertainty.
abstract: Fins' law was found to hold for discrete movements executed by subjects controlling the velocity of a cursor with a control stick The slope of movement time versus index of difficulty was approximately twice as large as for a comparable position control system. Target uncertainty also increased the slope of total time versus index of difficulty, and this effect is interpreted in terms of adaptive tuning of the human movement system.
authors.affiliation: Department of Psychology, The Ohio State University, Ohio, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Jagacinski
authors.forename: E J
authors.initials: EJ
authors.lastname: Hartzell
authors.forename: S
authors.initials: S
authors.lastname: Ward