Based on the Gardner, et al. (1959) interpretation of the leveling-sharpening dimension, order of presentation and length of viewing time were manipulated on a size-estimation task. Contrary to expectation, neither variable significantly affected performance, and four different subject-estimation patterns were isolated rather than the two patterns (leveling and sharpening) expected. Both magnitude and directional properties of the four estimation patterns were explained by a modified version of Parducci's range-frequency model.
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