Twenty-month-old Hannah realizes that her mother still exists even when Hannah cannot see her. What cognitive achievement has Hannah mastered?

Question

Quizplus · Accepted Answer

Hannah has mastered object permanence, which is the understanding that objects continue to exist even when they cannot be observed (seen, heard, touched, smelled, or sensed in any way). This is a key stage in the sensorimotor period of cognitive development according to Jean Piaget.

Twenty-Month-Old Hannah Realizes That Her Mother Still Exists Even When