Six-year-old Petunia and her three-year-old sister, Violet, found a box of Oreo cookies in the pantry. Petunia

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Six-year-old Petunia and her three-year-old sister, Violet, found a box of Oreo cookies in the pantry. Petunia pulls out eight Oreos, laying three side-by-side in front of her sister, and five side-by-side in front of herself. Violet complains, "Hey, no fair... you got more!". Petunia proceeds to spread the three Oreo's she gave her sister farther apart, so the total width of the three Oreos is equal to the width of Petunia's five Oreos. While Violet still has two fewer Oreos, she looks at the two sets and says, "thanks, that feels fair now". Piaget might explain that Violet's focus on only one element (i.e., how wide the row of Oreo's is), while ignoring other crucial elements, is due to her

intellectual

developmental disability

horizontal décalage

centration transduction