Weber Ratio for Visual Discrimination of Velocity

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Science  17 Jun 1960:
Vol. 131, Issue 3416, pp. 1809-1810
DOI: 10.1126/science.131.3416.1809


As an approximation based on various experiments reported in the literature, the least detectable difference in speed (δ w) varies in direct proportion to the speed (w) over a range from 0.1 to 20 degrees of visual angle per second. The constancy of the Weber ratio (δw/w) aids in understanding how men react to velocity in various situations.