In Baillargeon study of object permanence using the violation-of-expectation method, his subjects were

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Baillargeon's study on object permanence using the violation-of-expectation method involved infants who were between 3.5 and 4.5 months old. This research demonstrated that even very young infants have some understanding of object permanence, challenging Piaget's stages of cognitive development which suggested that this understanding develops later.

In Baillargeon Study of Object Permanence Using the Violation-Of-Expectation Method