The number of unique words in children's speech is one of most basic statistics indicating their language development. We may, however, face difficulties when trying to accurately evaluate the number of unique words in a child's growing corpus over time with a limited sample size. This study proposes a novel technique to estimate the latent number…

Replies to a report on three toddlers who evidenced a late vocabulary spurt. The article argues that differences in assessing productive vocabulary and the questionable inference that size of the lexicon is a reliable indicator of the vocabulary spurt make it inappropriate to compare these children to previous studies directly measuring change in…

Production of the deictic verbs "bring" and "take" was evaluated among 88 normally functioning elementary school children. Results showed that data evaluation procedures greatly influenced conclusions, the second-to-emerge form was easier to learn in a conventional way, and the second term was the proactive stimulus for…

Investigates the relationship between observational and checklist measures of vocabulary composition in preschool children. Results indicate that while the two measures are correlated, there are systematic quantitative differences between them, reflecting a combination of checklist, maternal-report and observational sampling biases. (22…

Examined the strength of the association between language exposure estimates and vocabulary learning for simultaneous bilingual infants with differing patterns of exposure to the languages being learned. Findings revealed that the correlation was strong, even for children whose language environments changed by more than 20% between observations.…

Investigates whether children ages 1;6 just beginning to learn words can learn new words in a variety of nonostensive contexts. The results of two studies involving adults interacting with children in games of searching for objects suggest that from very early in language acquisition, children learn words through active attempts to understand…

Toddlers in the lowest 10th percentile for lexical production were compared with age- and language-matched controls on measures of phonetic complexity, lexical development, and grammatical complexity. Results indicate an overlap between phonology, lexicon, and grammar and suggest the importance of true consonant production for lexical development.…

Reports on a study of the color terms used in Setswana. The study compared terms used by children with those of adults and those used by people from rural areas with those used by people from urban areas. Results show a move away from traditional Setswana color terms toward the use of borrowed English terms, particularly among the young and…