Meltzoff and Moore (1977) say it is innate. However, Piaget (1962) disagreed and says it is a result of a reward (reinforced). Yet, Meltzoff and Moore are backed up by a study from Murray and Trevarthen (1985) in which mothers and babies interacted over a video monitor. When the baby recieved no response from the mother, it became distressed. This suggests that the baby does not create a response after recieving a response from its mother aka that Meltzoff and Moore are correct.