Across a diverse range of languages, children proceed through similar stages in their production of causal language: their initial verbs lack internal causal structure, followed by a period during which they produce causative overgeneralizations, indicating knowledge of a productive causative rule. We asked in this study whether a child not…

Focusing on the question, "Can chimpanzees produce new sentences or merely sequences?" Terrace describes his efforts to teach the chimpanzee Nim to communicate through sign language. From his results, and the Gardners' experiments with Washoe, he concludes that no proof yet exists that chimpanzees can use language as humans do. (SJL)