Why Chimpanzees Can't Learn Language and Only Humans Can

In the 1970s, the behavioral psychologist Herbert S. Terrace led a remarkable experiment to see if a chimpanzee could be taught to use language. A young ape, named “Nim Chimpsky” in a nod to the linguist whose theories Terrace challenged, was raised by a family in New York and instructed in American Sign Language. Initially, Terrace thought that Nim could create sentences but later discovered that Nim’s teachers inadvertently cued his signing. Terrace concluded that Project Nim failed—not b...