Speech productions of 40 English- and 40 Japanese-speaking children (aged 2-5) were examined and compared with the speech produced by 20 adult speakers (10 speakers per language). Participants were recorded while repeating words that began with "s" and "sh" sounds. Clear language-specific patterns in adults' speech were found,…

Results indicated that the more frequently the children studied expressed emotion, the older the age of language achievements; and the more time spent in neutral affect, the younger the age of language achievements. (PCB)

Three studies examined the developmental relationship between early linguistic and cognitive achievements. Findings showed that children's ability to classify objects in a spatial or temporal order was independent of advances in productive vocabulary growth, suggesting that developments in categorization and naming depend on abilities in addition…

Quantitative growth curve models for estimating individual developmental functions from various types of longitudinal data are discussed in the context of investigator assumptions and research design characteristics. Linear and nonlinear models that estimate growth curves are illustrated, and contrasted when they are fit to speech development…

Examined how child and family factors influence individual differences in the language development of African-American children between 18 and 30 months of age. Found that vocabulary and utterance length increased linearly. Children from more stimulating and responsive homes had larger vocabularies, used more irregular nouns and verbs, and had…

The results, which contrasted markedly with findings of major group differences at 12 months of age, indicated that by age two no group differences were apparent on any child development, mother-child interaction, or maternal attitude measures, except that preterms were significantly poorer in motor skills than were full-term infants. (RH)