The proposition that choice reaction time increases as the logarithm of the number of alternatives. The law is usually expressed by the formula RT = a + b log2 (n + 1), where a and b are constants representing the intercept and slope of the function, respectively, and n is the number of alternatives. It was first documented by the German psychologist Julius Merkel (1834–1900) in the journal Philosophische Studien in 1885, therefore the name by which it is usually known is a misnomer and there is a strong case for calling it Merkel's law. Compare Fitts' law. [Named after the English physician W(illiam) Edmund Hick (1912–74) who reformulated it in 1952]
Subjects: Sports and Exercise Medicine — Psychology.