Fitt's law

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Quick Reference

A mathematical expression of the trade-off between the speed of a movement and its accuracy. For a simple aiming movement, the average movement time (T) is linearly related to the log2 of the ratio of the movement amplitude (A) and target width (W), as follows: T = a + b log2(2A/W). The law indicates that as speed of movement increases, accuracy tends to decrease. This law holds for a wide variety of movements.

Subjects: Sports and Exercise Medicine.

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