Six lexical principles for object label learning are evaluated. In this framework, lexical acquisition changes as a result of the particular principles a given child has at his or her disposal. These principles were developed for the class of object labels but may also apply across other early-appearing word classes. (Contains 98 references.) (JP)

Type/Token Ratios (TTRs) frequently fail to discriminate between children at widely different stages of language development, and may fall as children get older. Such effects are caused by a negative, though non-linear, relationship between sample size and TTR. Standardization of the number of tokens before computing TTRs is recommended.…