The infant who cries when her mother goes into another room, believing she is gone forever, may be demonstrating her lack of which concept, according to Piaget?

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According to Piaget, object permanence is the understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed. An infant who cries when her mother leaves the room may not yet have developed this concept, believing the mother is gone forever.

The Infant Who Cries When Her Mother Goes into Another