Paul M. Fitts (1954)
Journal of Experimental Psychology, 47(6), 381-391.
DOI: https://doi.org/10.1037/h0055392
Abstract. The original paper introducing what came to be known as Fitts's Law. Drawing on Shannon's information theory, Fitts shows that the time to move to a target is a linear function of the logarithm of the ratio of movement distance to target width, and defines the index of difficulty accordingly.
Tags: fitts motor-control foundational