Although the phenotypic correlation between language and nonverbal cognitive ability is well-documented, studies examining the etiology of the covariance between these abilities are scant, particularly in very young children. The goal of this study was to address this gap in the literature by examining the genetic and environmental links between…

Quantity and quality of caregiver input was examined longitudinally in a sample of 50 parent-child dyads to determine which aspects of input contribute most to children's vocabulary skill across early development. Measures of input gleaned from parent-child interactions at child ages 18, 30, and 42 months were examined in relation to children's…

Children vary widely in the rate at which they acquire words--some start slow and speed up, others start fast and continue at a steady pace. Do early developmental variations of this sort help predict vocabulary skill just prior to kindergarten entry? This longitudinal study starts by examining important predictors (socioeconomic status [SES],…

This study investigated the relation between teachers' (N = 22) use of sophisticated and complex language in urban middle-school classrooms and their students' (mean age at pretest = 11.51 years; N = 782; 568 language minority and 247 English only) vocabulary knowledge. Using videotaped classroom observations, teachers' speech was transcribed and…

In line with theories that children's pretend play reflects and extends their narrative skills, children with imaginary companions were predicted to have better narrative skills than children without imaginary companions. Forty-eight 5 1/2-year-old children and their mothers participated in interviews about children's imaginary companions.…

Disadvantaged children were tested on the Peabody Picture Vocabulary Test in their own homes or away from home in an office or schoolroom. The overall testing environment was a significant factor influencing the test performance of disadvantaged children who had not attended a Head Start program. Head Start children performed equally well in both…

Examined infant verbal and nonverbal cognitive development for 1,937 pairs of same-sex 2-year-old twins. Found that verbal and nonverbal development correlated .42. Genetic factors were responsible for less than half of this phenotypic correlation. The genetic correlation between verbal and nonverbal abilities was only .30, suggesting that genetic…

Working class and upper-middle class mothers were videotaped interacting with their toddlers in four settings. Samples of the mothers' adult-directed speech were also collected. Observed were social class differences in the mothers' child-directed speech and some parallel differences in the mothers' adult-directed speech. This may reflect more…

The paper's primary purpose is to outline an experimental logic that (1) considers causally prior skills such as nonverbal IQ, vocabulary, and decoding, and (2) emphasizes the relative importance of component reading skills rather than simple differences between groups of good and poor readers. (Author/DB)

This study examined relations among cortisol reactivity and measures of cognitive function and social behavior in 4- to 5-year-old children (N=169) attending Head Start. Saliva samples for the assay of cortisol were collected at the beginning, middle, and end of an approximately 45-min testing session. Moderate increase in cortisol followed by…

Investigated relations between children's attributes and peer play competence among African American preschoolers attending Head Start. Identified six distinctive profiles of personal attributes linked to adaptation in social functioning. Children with highly adaptable temperaments, strong ability to approach new situations, and above average…

Examined relations among measures of child language derived from observations of 20-month-olds' speech with mothers, experimenter assessments, and maternal reports. Found that structural equation modeling supported strong relations among the three sources, the loading of multiple measures on a single latent construct of vocabulary competence, and…

Examined the relationship between childhood malnutrition and later intellectual development in 18 severely malnourished (SM) children who participated in a 3-year home visitation intervention. Follow-ups done 7, 8, 9, and 14 years after hospitalization showed that these children had markedly higher vocabulary and achievement scores than a control…

Longitudinally examines the stability of the association between maternal behavior and preschool children's cognitive abilities. Outcome measures included both school readiness (assessed at ages five and six) and achievement on mathematics and vocabulary subtests of the Iowa Tests of Basic Skills at grade six. (Author/RH)