A new study conducted by linguists at the University of Pennsylvania has shown that children as young as 2 understand basic grammar rules when they first learn to speak and are not simply imitating adults.  The study also applied the same statistical analysis on data from one of the most famous animal language-acquisition experiments -- Project Nim -- and showed that Nim Chimpsky, a chimpanzee who was taught sign language over the course of many years, never grasped rules like those in a 2-year-old's grammar.

The study was conducted by Charles Yang, a professor of linguistics in the School of Arts and Sciences and of computer science in the School of Engineering and Applied Science. It was published in the Proceedings of the National Academy of Sciences.

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