What is the term for a young infant's awareness that objects continue to exist even when they are not perceived?

1. Piaget observed that a very young infant lives in the present and follows 'out of sight, out of mind'. 2. Hiding a toy in front of the infant causes the infant to react as if the toy no longer exists. 3. Piaget called the missing capacity object permanence. 4. Object permanence emerges gradually around 8 months of age. 5. Hence the missing infant capacity is named object permanence. _Source: syllabus Psychology Ch 3 "Human Development", p. 47, Cognitive Development in Infancy_