A game of peekaboo excites Warren because he lacks object permanence.
The concept of object permanence says that things exist even when they can't be sensed. Developmental psychology, a branch of psychology that studies how young children's social and intellectual abilities develop, studies this fundamental idea.
The Swiss psychologist Jean Piaget claimed that understanding object permanence is one of a baby's most significant learnings because without it, objects wouldn't have a distinct and lasting existence. Infants achieve this understanding by the end of the 'sensorimotor stage' which lasts from birth to about two years of age, according to Piaget's theory of cognitive development. Piaget believed that a child's motor development would determine how they perceived and understood the world.
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