Eight-month-old Vincent was playing with his ball, and it rolled under the couch, where it was out of sight. Vincent began to cry and did not know to look for the ball under the couch. This is because Vincent has not yet achieved object:

Question

Quizplus · Accepted Answer

Object permanence is the understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed. Vincent's inability to understand that the ball still exists under the couch, even though he can't see it, indicates he has not yet achieved object permanence.

Eight-Month-Old Vincent Was Playing with His Ball, and It Rolled