Two linguistically deficient children of deaf parents had been cared for almost exclusively by their mother, who did not speak or sign to them. Intervention led to erasure of idiosynchratic speech pattern in the older child and in increasing both children's expressive ability. Implications for language-learning are discussed. (PJM)

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.…