Five-year-old Linus is playing with his baby sister, Lucy. He takes Lucy's teddy bear and hides it behind a pillow while Lucy watches. Lucy quickly finds the bear. Then Linus puts teddy in a bag, puts the bag behind a chair (where he dumps teddy), and then brings out the empty bag. Lucy looks inside the bag, but doesn't look for teddy behind the chair and is surprised when it is not there. According to Piaget, Lucy

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Quizplus · Accepted Answer

Lucy is committing the A not B error, which is a common mistake made by young children when they search for a hidden object in a previously successful hiding spot (A), even after seeing it being hidden in a new spot (B). This indicates that Lucy has not yet fully developed the concept of object permanence, which is the understanding that objects continue to exist even when they are not visible. The other options are not applicable in this situation.

Five-Year-Old Linus Is Playing with His Baby Sister, Lucy