Direction of shift in the judgment of single stimuli.

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Abstract
Measures were taken of the shifts in absolute judgements of visual size and tonal pitch following various changes in the range and relative frequencies of the presented stimuli. Judgment shifts were greater following extension than following restriction of the range. They were also greater when the postshift series was composed of the less frequent stimuli of the preshift series and when the stimuli were changed in regard to an unjudged dimension (color). The shifts appeared to be independent of the discriminability of the stimulus changes but rather to reflect the probability of the preshift and postshift series being random samples from the same stimulus population, the preshift distribution. These findings appeared to be inconsistent with the usual assumption that judges fit their judgment scales to the distribution of stimuli they are judging. Evidence was also presented suggesting that absolute judgments reflect differences in stimulus distribution when there are no differences in stimulus range.
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