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Vierordt's The Experimental Study of the Time Sense (1868) and its legacy

The paper discusses the results from Vierordt's 1868 book Der Zeitsinn nach Versuchen [The Experimental Study of the Time Sense]. Illustrations of “Vierordt's Law”, the proposition that short durations are judged as longer than they really are, whereas long durations are judged as shorter, with an “indifference point” in between, are provided, mainly from reproduction experiments where Vierordt and his students or colleagues served as experimental participants. Other work from Der Zeitsinn including time discrimination and categorical timing procedures is also presented. Some subsequent research on Vierordt's Law and the “indifference point” is discussed with respect to some issues in contemporary timing theory.