Bernard, a 10-month-old, is playing with his mother. His mother hides his favorite toy under a pillow and then asks Bernard to look for it. Bernard smiles at his mother and then looks for the toy under the pillow. The understanding of the concept of object permanence is a hallmark of Jean Piaget's ________.

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Bernard's behavior demonstrates an understanding of object permanence, which is the knowledge that objects continue to exist even when they cannot be seen, heard, or touched. This understanding is a key development in Jean Piaget's sensorimotor stage, which typically occurs from birth to about 2 years of age.

Bernard, a 10-Month-Old, Is Playing with His Mother