Jill is 12 months old. Her mom often hides her favourite toy under the table when she plays with her. Jill is absolutely surprised when the toy is brought back to the table again. Jill's surprise reflects Piaget's concept of

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Jill's surprise indicates she has not yet developed object permanence, which is the understanding that objects continue to exist even when they cannot be seen. This concept is typically developed during the sensorimotor stage of Piaget's theory of cognitive development.

Jill Is 12 Months Old