Patricia Kuhl of the University of Washington gave a TED talk late last year and it is now live on their site. Kuhl has done some interesting work on the sheer complexity of language learning during infancy, and dicusses the complexities of the integrated brain systems that support language. From TED:
Patricia Kuhl shares astonishing findings about how babies learn one language over another — by listening to the humans around them and “taking statistics” on the sounds they need to know. Clever lab experiments (and brain scans) show how 6-month-old babies use sophisticated reasoning to understand their world.