Abstract
Slides taken of stands in a sports stadium portraying crowds of from 8 to 1122 people were viewed by 137 observers. The observers tended to underestimate the actual numbers in the crowds; the accuracy of their estimates depended on the stand in which the crowds were situated and whether the observers viewed a training slide. Underestimation of size of a crowd is consistent with previous research on visual numerosity, but exponents of the power-law function relating estimated to actual numbers were in the range 0.95 to 1.13, higher than those found previously.

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