Early Child Language Mediates the Relation Between Home Environment and School Readiness

Home environment quality is a well-known predictor of school readiness (SR), although the underlying processes are little known. This study tested two hypotheses: (a) child language mediates the association between home characteristics (socioeconomic status and exposure to reading) and SR, and (b) genetic factors partly explain the association between language and SR. Data were collected between 6 and 63 months in a large sample of twins. Results showed that home characteristics had direct effects on SR and indirect effects through child language. No genetic correlation was found between language and SR. These results suggest that home characteristics affect SR in part through their effect on early language skills, and show that this process is mainly environmental rather than genetic in nature.     

A genetically sensitive investigation of the effects of the school environment and socio‐economic status on academic achievement in seven‐year‐olds

Although it is well established that school characteristics (SCH) and socio‐economic status (SES) are associated with academic achievement (ACH), these correlations are not necessarily causal. Because academic achievement shows substantial genetic influence, it is useful to embed such investigations in genetically sensitive designs in order to examine environmental influences more precisely by controlling genetic influence on ACH. In the first study of this kind for academic achievement, data were collected for 1,063 same‐sex pairs of seven‐year‐old MZ and DZ twins for teacher‐assessed ACH, UK statistics on SCH, and parent‐reported SES. Exclusive of genetic influence on school achievement, shared environment (environmental influences that make siblings similar) accounts for 12% of the variance in academic achievement. SCH accounts for 17% and SES accounts for 83% of this shared environmental variance. Exclusive of genetic and shared environmental influence including SCH and SES, nonshared environment (environmental influences that do not make siblings similar) accounts for 19% of the variance in academic achievement. The importance of nonshared environmental influences on academic achievement leads to the question of what these child‐specific experiences might be that are not shared by children in the same family, school, and classroom.     

Mexican Mothers’ English Proficiency and Children's School Readiness: Mediation Through Home Literacy Involvement

Research Findings: Home literacy involvement (e.g., shared book reading) has been linked to enhanced cognitive development and school readiness during early childhood. Furthermore, precursory reading and math skills are key predictors of high school achievement. This study examined prospective relations between Mexican mothers’ English proficiency, their home literacy involvement, and their children's school readiness (i.e., preschool reading and math scores). A large, nationally representative sample of preschool-age Mexican American children (N = 826) was used to test a theoretically derived path analysis that demonstrated that mother-reported home literacy involvement mediated the relation between mother-reported English proficiency and children's reading achievement, but not math. Results were evident even after key family and child characteristics were controlled. Practice or Policy: Findings suggest that Mexican American children's early education and development may be enriched by family literacy programs that enhance their mothers’ English proficiency and increase the frequency of home literacy activities.     

Does Higher Quality Early Child Care Promote Low‐Income Children’s Math and Reading Achievement in Middle Childhood?

Higher quality child care during infancy and early childhood (6–54 months of age) was examined as a moderator of associations between family economic status and children's ( N  = 1,364) math and reading achievement in middle childhood (4.5–11 years of age). Low income was less strongly predictive of underachievement for children who had been in higher quality care than for those who had not. Consistent with a cognitive advantage hypothesis, higher quality care appeared to promote achievement indirectly via early school readiness skills. Family characteristics associated with selection into child care also appeared to promote the achievement of low-income children, but the moderating effect of higher quality care per se remained evident when controlling for selection using covariates and propensity scores.     

Associations Between School Readiness and Obesity‐ and Inflammation‐Related Biomarkers in Low‐Income Preschoolers Within the Healthy Kids Study

Previous research suggests obesity is negatively related to cognitive functioning and academic outcomes in addition to physical health. However, not much is known about this association in early childhood or potential physiological underpinnings. Biomarkers related to obesity have been associated with cognition, in particular the adipokine leptin, and pro‐inflammatory cytokines including interleukin‐6 (IL‐6), tumor necrosis factor‐alpha (TNF‐alpha) and C‐reactive protein (CRP). These associations may be further exacerbated for children who experience early life stress. With a sample of low‐income preschoolers, the current study examined associations between obesity‐related biomarkers and aspects of behavioral and cognitive school readiness. Partial correlations controlling for child age show hypothesized negative associations between pro‐inflammatory cytokines and school readiness, while leptin was positively associated with cognitive school readiness and body mass index (BMI) z‐score. Findings suggest connections between obesity, physiology, and school readiness need further examination, but may have implications for early childhood education and health interventions.     

Exploring patterns of Latino/a children's school readiness at kindergarten entry and their relations with Grade 2 achievement

This study contributed to the school readiness literature by taking an intrachild perspective that examined the relations between Latino/a children's school readiness profiles and later academic achievement. Teachers rated the school readiness of 781 Latino/a kindergartners during the first month of school using the Kindergarten Student Entrance Profile (KSEP). Latent class analysis (LCA) examined KSEP profiles across social-emotional, physical, and cognitive domains and identified five distinct school readiness classes that described students’ strengths and weaknesses at kindergarten entry. Among the predictors examined, gender was the only significant difference among the top two readiness classes, with girls less likely to be in the lower of these two classes (OR = 0.38). In addition, children in the bottom three readiness classes were significantly less likely than students in the top readiness class to have preschool experience (ORs = 0.02–0.19) and had significantly lower levels of English proficiency (ORs = 0.51–0.72). Class membership was significantly associated with scores on the Grade 2 California Standards Tests and only the top two readiness classes had reading fluency rates near or above a national benchmark at the end of Grade 2. The variation of early achievement found across readiness classes also showed that considering the pattern of a child's social-emotional and cognitive readiness might enhance school readiness assessment. Implications for integrating universal school readiness screeners within a comprehensive multigating assessment model are also discussed.     

From learning to read to reading to learn: substantial and stable genetic influence

Little is known about the underlying causes and developmental patterns of stability and change in early reading abilities. In a longitudinal study of twins (n=4,291 pairs), individual differences in reading achievement assessed by teachers using U.K. National Curriculum (NC) criteria showed substantial heritabilities at ages 7, 9, and 10 years (.57-.67) and modest shared environmental influences (.10-.17). Stability in NC scores was primarily mediated genetically. There was also evidence for age-specific genetic influences at each age. Genetic influences on reading are substantial and stable during the elementary school years despite the shift from "learning to read" to "reading to learn."     

Behavior Concerns Among Low-Income,Ethnically and Linguistically Diverse Children in Child Care: Importance for School Readiness and Kindergarten Achievement

Research Findings: Recent research and teacher reports have highlighted the importance of early behavior skills for children’s school readiness and academic success in elementary school. Significant gaps in school readiness and achievement exist between children in poverty and those more affluent. Low-income children are also more likely to exhibit behavior concerns than their more financially advantaged peers. The current study examined the importance of behavior skills at age 4 for school readiness and academic achievement in kindergarten among an ethnically diverse sample of 1,618 low-income children (63% Latino, 37% Black) in an urban setting. Children’s early behavior concerns at age 4 were significantly associated with children’s school readiness scores and end-of-year kindergarten grades above and beyond the contributions of family and child demographics and children’s early cognitive and language skills. In addition, behavior problems were more strongly related to school readiness and kindergarten performance within English-dominant Latino children as opposed to Spanish-dominant Latino children. Practice or Policy: The findings from the current study provide support for targeting behavior skills, and not just preliteracy and/or number skills, prior to school entry as a strategy to increase the likelihood of low-income diverse children’s school readiness and school success. Behavior interventions are discussed.     

Why Don’t Smart Teens Have Sex? A Behavioral Genetic Approach

Academic achievement and cognitive ability have been shown to predict later age at first sexual intercourse. Using a sample of 536 same-sex twin pairs who were followed longitudinally from adolescence to early adulthood, this study tested whether relations between intelligence, academic achievement, and age at first sex were due to unmeasured genetic and environmental differences between families. Twins who differed in their intelligence or their academic achievement did not differ in their age at first sex. Rather, the association between intelligence and age at first sex could be attributed entirely to unmeasured environmental differences between families, whereas the association between academic achievement and age at first sex could be attributed entirely to genetic factors.     

Mediated Effects of Preschool Intervention

Consistent evidence that the effect of preschool intervention on cognitive achievement fades with the passage of time has resulted in a search for mediators of preschool. This study investigated factors that play a role in mediating the effects of a government funded Child–Parent Center preschool program. The school adjustment of 266 low-income, mostly Black preschool children and of 125 comparison group children were matched on neighborhood characteristics and were traced from kindergarten through the third year of school (1986–1989). Data were collected from children, parents, and teachers on entering kindergarten cognitive readiness, teacher ratings of socioemotional maturity, parental involvement at home and in school, grade retention, assignment to special education, school mobility and cognitive achievement in reading and mathematics. Results of a latent-factor structural model indicated that preschool influenced later achievement and retention indirectly rather than directly. Four major pathways through which preschool exerted its effect included (1) cognitive readiness, (2) cognitive readiness and teacher ratings of socioemotional maturity, (3) teacher ratings of socioemotional maturity, and (4) parent involvement and school mobility. Cognitive readiness, teacher ratings, and parent involvement also transmitted effects to grade retention. That preschool's influence on later outcomes is largely indirect indicates its dependency on intervening factors in exerting effects. These intervening factors appear to be critical in promoting school success of children at risk.     

Mediated Effects of Preschool Intervention

Consistent evidence that the effect of preschool intervention on cognitive achievement fades with the passage of time has resulted in a search for mediators of preschool. This study investigated factors that play a role in mediating the effects of a government funded Child-Parent Center preschool program. The school adjustment of 266 low-income, mostly Black preschool children and of 125 comparison group children were matched on neighborhood characteristics and were traced from kindergarten through the third year of school (1986-1989). Data were collected from children, parents, and teachers on entering kindergarten cognitive readiness, teacher ratings of socioemotional maturity, parental involvement at home and in school, grade retention, assignment to special education, school mobility and cognitive achievement in reading and mathematics. Results of a latent-factor structural model indicated that preschool influenced later achievement and retention indirectly rather than directly. Four major pathways through which preschool exerted its effect included (1) cognitive readiness, (2) cognitive readiness and teacher ratings of socioemotional maturity, (3) teacher ratings of socioemotional maturity, and (4) parent involvement and school mobility. Cognitive readiness, teacher ratings, and parent involvement also transmitted effects to grade retention. That preschool's influence on later outcomes is largely indirect indicates its dependency on intervening factors in exerting effects. These intervening factors appear to be critical in promoting school success of children at risk.     

The Relationship of Family Variables to Head Start Children's Preacademic Competence

This study was conducted with a sample of 93 Head Start children and their mothers. It examined the contribution of family variables (i.e., parenting style, home literacy activities, maternal school involvement, and maternal expectations) to children's preacademic competence as defined by four criteria: (a) performance on a standardized achievement battery; (b) teachers' ratings of children's cognitive competence; (c) children's self-ratings of competence; and (d) maternal reports of children's early school adjustment. In exploring these relationships the study controlled for the influence of variables (i.e., child and maternal cognitive variables, child sex, as well as risk due to daily stress) that have been suggested to influence directly, or indirectly, maternal involvement and child competence. Hierarchical regression analyses indicated that educational expectations, home literacy variables, and school involvement were predictive of children's competence even after accounting for the effects of maternal education, child IQ, and daily stress. Specifically, maternal educational expectations were predictive of preacademic achievement and teacher-rated competence. Maternal engagement in educational activities at home was predictive of children's self-efficacy beliefs and school adjustment. Maternal school involvement was also predictive of school adjustment.     

The Relationship of Family Variables to Head Start Children's Preacademic Competence

This study was conducted with a sample of 93 Head Start children and their mothers. It examined the contribution of family variables (i.e., parenting style, home literacy activities, maternal school involvement, and maternal expectations) to children's preacademic competence as defined by four criteria: (a) performance on a standardized achievement battery; (b) teachers' ratings of children's cognitive competence; (c) children's self-ratings of competence; and (d) maternal reports of children's early school adjustment. In exploring these relationships the study controlled for the influence of variables (i.e., child and maternal cognitive variables, child sex, as well as risk due to daily stress) that have been suggested to influence directly, or indirectly, maternal involvement and child competence. Hierarchical regression analyses indicated that educational expectations, home literacy variables, and school involvement were predictive of children's competence even after accounting for the effects of maternal education, child IQ, and daily stress. Specifically, maternal educational expectations were predictive of preacademic achievement and teacher-rated competence. Maternal engagement in educational activities at home was predictive of children's self-efficacy beliefs and school adjustment. Maternal school involvement was also predictive of school adjustment.     

Patterns of school readiness forecast achievement and socioemotional development at the end of elementary school

A person-oriented approach examined patterns of functioning in social and executive function domains at 54 months and in turn forecasted 5th-grade socioemotional and achievement outcomes for 944 children. Six distinct profiles of 54-month school readiness patterns predicted outcomes in 5th grade with indications of cross-domain association between 54-month performance and later functioning. A group of children at 54 months characterized by low working memory exhibited elevated levels of socioemotional problems and low achievement in 5th grade. Patterns in which high social competence or high working memory were prominent predicted high 5th-grade achievement. Unexpectedly, a group distinguished by attention problems performed well on later achievement outcomes. After controlling for children's early demographics, readiness profiles accounted for math achievement in 5th grade.     

The influence of being ready to learn on children’s early school literacy and numeracy achievement

This study investigated the extent to which learning readiness, prior‐to‐school experiences, and child and family characteristics influence children’s literacy and numeracy achievement across the first year of primary school. A sample of 104 kindergarten children was recruited from 16 classrooms and followed from the beginning to the end of their first year of primary school. At the start of school, parents provided information on children’s prior‐to‐school experiences and their preparedness for school; teachers provided ratings of children’s self‐directedness and cooperative participation; and children’s cognitive ability was assessed using the Peabody Picture Vocabulary Test – III. Classroom quality was observed and rated mid‐year. Children’s literacy and numeracy achievement was assessed at the end of the school year, using the Who Am I? (WAI?). Regression analyses indicated that WAI? scores were predicted by child age, gender, cognitive ability and teacher‐rated learning readiness at the start of school. Discussion focuses on the importance of the ‘ready child’ for early academic success.     

Do preschool executive function skills explain the school readiness gap between advantaged and disadvantaged children?

We examine the extent to which executive functions (EFs), as opposed to other cognitive skills, account for socioeconomically based disparities in school readiness. Participants are 226 American children (aged 36–71 months) enrolled in either needs-based or private preschools. Children completed 6 tasks designed to measure EFs as well as assessments of general intelligence and speed of cognitive processing. Children were also assessed on math, reading, and vocabulary skills. EFs accounted for unique variance across all academic measures even when controlling for speed of processing and general intelligence and partially accounted for disparities in school readiness associated with type of preschool enrollment. When vocabulary was controlled in the model, EFs only mediated associations between type of preschool and math. Vocabulary skills accounted for associations between socioeconomic status and both math and reading achievement. General intelligence and speed of processing did not uniquely account for associations between disadvantage and school readiness.     

Intelligence and Achievement: A Behavioral Genetic Perspective

Understanding the etiology and relationship between standardized intelligence and academic achievement tests is essential, given their ever-increasing role in American education. Behavioral genetic studies have examined the genetic and environmental etiology of intelligence, academic achievement, and their relationship. Results suggest that genetic, shared environmental, and nonshared environmental influences have an impact on intelligence and academic achievement. Behavioral genetic studies also suggest that the importance of genes may vary as a function of age. Other studies suggest that genes drive the correlation and that the nonshared environment drives the discrepancy between measures of intelligence and achievement. Implications for the identification of intellectually and academically relevant environmental influences are discussed.     

Genetic and environmental influences on prereading skills and early reading and spelling development in the United States, Australia, and Scandinavia

Genetic and environmental influences on prereading skills in preschool and on early reading and spelling development at the end of kindergarten were compared among samples of identical and fraternal twins from the U.S. (Colorado), Australia, and Scandinavia. Mean comparisons revealed significantly lower preschool print knowledge in Scandinavia, consistent with the relatively lower amount of shared book reading and letter-based activities with parents, and lack of emphasis on print knowledge in Scandinavian preschools. The patterns of correlations between all preschool environment measures and prereading skills within the samples were remarkably similar, as were the patterns of genetic, shared environment, and non-shared environment estimates: in all samples, genetic influence was substantial and shared environment influence was relatively weak for phonological awareness, rapid naming, and verbal memory; genetic influence was weak, and shared environment influence was relatively strong for vocabulary and print knowledge. In contrast, for reading and spelling assessed at the end of kindergarten in the Australian and U.S. samples, there was some preliminary evidence for country differences in the magnitude of genetic and environmental influences. We argue that the apparently higher genetic and lower shared environment influence in the Australian sample was related to a greater emphasis on formal reading instruction, resulting in more advanced reading and spelling skills at the end of kindergarten, and thus there was greater opportunity to observe genetic influences on response to systematic reading instruction among the Australian twins.     

The early developmental competencies and school readiness of low-income,immigrant children: Influences of generation,race/ethnicity,and national origins

Though much valuable research has been conducted on the academic achievement of school-age immigrant youth, less is known about the early developmental competencies of immigrant children during the preschool years. This study describes the school readiness of 2194 low-income children receiving subsidies to attend child care with emphasis on how nativity status (generation), race/ethnicity, and national origins might be related to children's preparedness for kindergarten. The Learning Accomplishment Profile–Diagnostic (LAP-D) was used to measure cognitive and language skills, while teacher-report on the Devereux Early Childhood Assessment (DECA) measured socio-emotional protective factors and behavior concerns. Results demonstrate that variation does exist in school readiness according to nativity-based factors. First- and second-generation immigrants lagged behind children in non-immigrant families in cognitive and language skills but excelled by comparison in socio-emotional skills and behavior. In many cases, first-generation immigrant children showed more advanced development than second-generation immigrant children, providing some evidence in the early years for an immigrant advantage. The present study raises awareness regarding some of the strengths immigrant children demonstrate from a very young age—strengths that can be built upon to encourage their later success and academic achievement.     

The genetic and environmental origins of learning abilities and disabilities in the early school years

Despite the importance of learning abilities and disabilities in education and child development, little is known about their genetic and environmental origins in the early school years. We report results for English (which includes reading, writing, and speaking), mathematics, and science as well as general cognitive ability in a large and representative sample of U.K. twins studied at 7, 9, and 10 years of age. Although preliminary reports of some of these data have been published, the purpose of this monograph is to present new univariate, multivariate, and longitudinal analyses that systematically examine genetic and environmental influences for the entire sample at all ages for all measures for both the low extremes (disabilities) and the entire sample (abilities). English, mathematics, and science yielded similarly high heritabilities and modest shared environmental influences at 7, 9, and 10 years despite major changes in content across these years. We draw three conclusions that go beyond estimating heritability. First, the abnormal is normal: Low performance is the quantitative extreme of the same genetic and environmental influences that operate throughout the normal distribution. Second, continuity is genetic and change is environmental: Longitudinal analyses suggest that age-to-age stability is primarily mediated genetically, whereas the environment contributes to change from age to age. Third, genes are generalists and environments are specialists: Multivariate analyses indicate that genes largely contribute to similarity in performance within and between the three domains--and with general cognitive ability--whereas the environment contributes to differences in performance. These conclusions have far-reaching implications for education and child development as well as for molecular genetics and neuroscience.