 Some variation in grammatical performance is attributed to maturation, however, all participants began immersion programs before puberty and so were too young for a strong critical period hypothesis to be directly tested.This corresponds to Noam Chomsky’s UG theory, which states that while language acquisition principles are still active, it is easy to learn a language, and the principles developed through L1 acquisition are vital for learning an L2.One study that specifically mentions semantic functions acquisition is that of .