Dependence of equality judgments upon the temporal interval between stimulus presentations.

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Abstract
Judgments of equality were obtained from 8 independent groups of Ss following a comparison of a standard 50-mm line with either a 50-, 54-, 58-, or 62-mm line presented after either ½ min. or 8 min. Percentage of equal judgments was significantly greater following the 8-min presentation interval than following the ½-min interval only for lines longer than the standard. A 2nd judgment by each S with the other presentation interval indicated that the effect of presentation interval depended upon the order of intervals used. The 1st-judgment data parallel the results of several animal studies which showed an increase in response strength to generalized stimuli with time. All of these findings are consistent with the hypothesis that the number of jnd's separating 2 similar stimuli decreases as the time between presentations of the stimuli increases. This hypothesis reconciles the data with Hull's theory of stimulus generalization. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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