Variation of the size of the context circles in the Ebbinghaus illusion results in a systematic variation of the apparent size of the central test figure that is in accord with a comparative judgmental model of this illusion. However, increasing the distance of the context figures results in a decrease in the apparent size of the test figure regardless of the size of the context circles. This result is not predicted by a judgmental model and indicates a similarity between the Ebbinghaus and Delboeuf illusions.
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Girgus et al. (1972) studied this question.
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