| Summary: | The study of the speed of human reactions is older than experimental psychology. Starting in the early 1800's as the study of the "personal equation" in astronomy, it became known as "mental chronometry" in psychological laboratories of the late 19th Century (Boring, 1950). The time elapsing between the presentation of a predetermined signal and the occurrence of a predetermined response served as a measure of reaction speed. This measure, reaction time or response latency, was studied in relation to several variables (e.g., preparation, attention, signal modality) by the early investigators. [...]
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