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Vierordt's law is "a robust phenomenon in time estimation research that has been observed with different time estimation methods". It states that, retrospectively, "short" intervals of time tend to be overestimated, and "long" intervals of time tend to be underestimated. The other major paradigm of time estimation methodology measures time prospectively.
- Fortin, Claudette; and Rousseau, Robert; (1998) Interference from short-term memory processing on encoding and reproducing brief durations, Psychological Research, 61, pp. 269-276