When an infant searches for an object that has rolled out of sight, this is evidence of _________ according to Piaget's cognitive-developmental theory.

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Object permanence is the understanding that objects continue to exist even when they are no longer visible or able to be heard. Piaget believed that infants achieve object permanence around 8-9 months old, and searching for a hidden object is a sign of this cognitive milestone.

When an Infant Searches for an Object That Has Rolled