Answer: Object permanence
Explanation: In the scenario above, it could be said that Raj has developed the cognitive ability to deduce that the existence of an object does not cease even when it isn't visible. This is evidenced by Raj's decision to crawl up and locate the hidden toy. This phenomenon according to paiget is developed during the sensorimotor stage of child development usually between 18 to 24 months of age. When object permanence is developed in a child, inability to see, hear or feel an object will no longer translate to non-existence of such object.