Untitled DocumentFitts' Law Fitts' Law is a quantification of the speed-accuracy trade-off in human movements. In this practical students collect data from subjects tapping a finger backwards and forwards between two targets. Fitts' Law predicts that the time taken to move between targets should be a function of the distance between the targets and the size of the targets.
As an extension, the two targets could be of different size. Fitts' Law predicts that the movement times should be asymmetric, however it usually emerges that the movement times for the rightwards and the leftwards movements are identical, suggesting a higher level of movement planning than two separate ballistic movements.