A study was made of the effects of four variables (initial angle size, rate of change, direction of change and percentage of change) on the accuracy of judgments of size changes in visual angles. Two groups of Ss in a darkened room reported their judgments of the expansion or contraction of a variable bar of light. The accuracy of these judgments was affected by rate of change, direction of change, and percentage of change but not directly by initial angle size. Significant interactions were found for initial angle size by percentage of change, direction of change by percentage of change, percentage of change by rate of change and direction of change by percentage of change by groups.
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