A 9-month-old who has always found her doll in the toy box sees her mother place the doll in the closet. As the doll disappears, the infant crawls directly to the toy box to search for this toy. According to Piaget, the child

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The infant's behavior suggests that she believes that her previous actions (crawling to the toy box) determine the doll's location. This is consistent with Piaget's idea of "object permanence," which develops in the sensorimotor stage around 8-12 months. The infant has not yet fully comprehended that objects continue to exist even when they are out of sight. Therefore, when the doll disappears, she does not realize it still exists, even though she saw her mother move it.

A 9-Month-Old Who Has Always Found Her Doll in the Toy