Distributional learning is a proposal for how infants might learn early speech sound categories from acoustic input before they know many words. When categories in the input differ greatly in relative frequency and overlap in acoustic space, research in bilingual development suggests that this affects the course of development. In the present…

Major innovations are becoming available for research in language development and disorders. Among these innovations, recent tools allow naturalistic recording in children's homes and automated analysis to facilitate representative sampling. This study employed all-day recordings during the 2nd year of life in a child exposed to three languages,…

Followup to earlier report that focused on initial uses of first 10 words produced by 4 children is presented. Results of analysis of subsequent use of these 40 words is presented. Findings indicate that the role of linguistic input in early lexical development may decline sharply once a child has established initial uses for words. (24…

Input language addressed to language-learning children was analyzed to assess the quality of the semantic-syntactic correspondence posited by the semantic bootstrapping hypothesis. This correspondence was strong--objects were labeled with nouns, actions with verbs, attributes with adjectives--and may serve to make children's construction of…

Naturalistic mother-child speech between autistic, Down's syndrome, or normal children and their mothers was studied to determine whether imitation facilitates grammar acquisition. Spontaneous utterances were longer and contained more advanced grammar than imitation utterances, indicating that imitation does not play a significant role in grammar…

Examined the role of exposure to speech in children's vocabulary growth. Characterized vocabulary growth rates for children from 14 to 26 months of age. Found a relation between individual differences in vocabulary acquisition and variations in the amount of a mother's speech to her children. (BC)