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Examples of stimuli used in the experiments to measure the accuracy of relative numerosity discrimination. (a) Dots blurred with s = 2 pixels. (b) The case of σ = 6 pixels. In the equal-blur condition, both the test and standard had s = 2 pixels. In the unequal-blur condition, the blur for the test was chosen randomly on each trial in the range 2–6 pixels, as was that of the standard.
