Six-, 9-, and 12-yr.-old boys and girls were compared in terms of the strengths of positive and negative Delboeuf illusions elicited by standards which Piaget demonstrated produced maximal illusion effects in various age groups. Results obtained with the positive illusion, although not statistically significant, give some support to the contention that the illusion decreases with age. However, the negative illusion increased with age and the results indicate that the interaction of age with sex is significant in the operation of this illusion.
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