If all languages have the same underlying grammar (Universal Grammar), this implies that it is an innate human disposition. Chomsky suggests that is the reason why humans learn languages so easily as children. But surely we learn lots of things more easily when we are young such as learning to play a musical instrument?
How can Chomsky's notion of Universal Grammar be tested empirically to distinguish it from so many other things that we learn more easily when we are younger? What makes then the language function a part of psychology rather than something to be learned amongst all the other things we learn? Thank you for your ideas with this. Dave