An alternative to Fitts’ law

A new power law of movement time for motor control tasks is proposed as an alternative to the classical Fitts’ law. A reanalysis of Fitts’ original data indicates that this power law may provide superior fits to those of Fitts’ law, which may be interpreted as a special case of the power law. The so-called rate of change of information derived from Fitts’ law, which is claimed to be an invalid information-theoretic measure, is an exponentially decreasing function of Fitts’ index of difficulty according to the power law rather than a fixed quantity as derived from Fitts’ law.

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