A study was made of the effects of 4 variables (stimulus dimension, interstimulus interval, percentage of change, and direction of change) on the accuracy of judgments of size changes in visual angles. 10 Ss in a darkened room reported judgments of the relative size of successive pairs of projected figures. The accuracy of these judgments was affected by direction of change and percentage of change but not directly by stimulus dimension or interstimulus interval. Significant interactions were found for stimulus dimension by direction of change, direction of change by percentage of change, and direction of change by interstimulus interval.
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