Pierce "et al." (2017) have proposed that variations in the timing, quality and quantity of language input during the earliest stages of development are related to variations in the development of phonological working memory and, in turn, to later language learning outcomes. To examine this hypothesis, three groups of children who are…

Research on sources of individual difference in parental Infant-Directed Speech (IDS) is limited and there is a particular lack of research on fathers' compared to mothers' speech. This study examined the predictive relations between infant characteristics and variability in paternal lexical diversity (LD) in dyadic free play with two-year-olds (M…

Fourteen Mother-Infant pairs were studied at three, six, and nine months to determine whether mothers simplify speech during the second half of the infant's first year and whether speech adjustment influences later language acquisition by infants. A mother's mean length of utterance (MLU) was predictive of later language development by her infant.…