When a preoperational child, Delores, is asked if she has a sister, Delores replies, "Yes." Then, when asked further, "What's her name," Delores states, "Mary." Then Delores is asked if Mary has a sister, and Delores replies, "No." This conversational exchange reflects Delores' preoperational limitation in reasoning known as

Question

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Preoperational children often struggle with irreversibility, which is the inability to mentally reverse a sequence of events or logical operations. Delores cannot reverse the idea that if she has a sister, then her sister must also have a sister.

When a Preoperational Child, Delores, Is Asked If She Has