Baby Hilary is 2 months old and her cousin Baby Marcus is 10 months old. Their uncle plays "hide the ball under the blanket" with Hilary and Marcus. Marcus tries to look for the ball under the blanket but Hilary does not. This is because Marcus has learned:

Question

Quizplus · Accepted Answer

Marcus is demonstrating an understanding of object permanence, which is the awareness that objects continue to exist even when they are not visible. This cognitive development typically emerges around 8 months of age, explaining why Marcus, but not 2-month-old Hilary, looks for the ball.

Baby Hilary Is 2 Months Old and Her Cousin Baby