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.     

Why are hyperactivity and academic achievement related?

Although a negative association between hyperactivity and academic achievement is well documented, little is known about the genetic and/or environmental mechanisms responsible for the association. The present study explored links between parent and teacher ratings of hyperactive behavior problems and teacher-assessed achievement in a sample of 1,876 twin pairs (mean age 7.04 years). The results did not differ across rater, nor were there significant differences between males or females or for twins in the same or different classrooms. Hyperactivity was significantly correlated with achievement. Multivariate model-fitting analyses revealed significant genetic and nonshared environmental covariance between the two phenotypes. In addition, bivariate heritabilities were substantial, indicating that the phenotypic correlations between hyperactivity and achievement were largely mediated by genetic influences.     

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.     

The etiology of giftedness

Many theories of giftedness either explicitly or implicitly acknowledge the role of genetic influences; yet, empirical work has not been able to establish the impact that genes have specifically on gifted behavior. In contrast, a great deal of research has been targeted at understanding the etiology of individual differences in general and specific cognitive abilities across the entire range of ability and to a lesser extent, high cognitive ability. This paper attempts to outline what we know and what we don't know about the etiology of giftedness as operationally defined as high g. We review studies selected to represent a variety of approaches that each address a different question about genetics and giftedness. These studies include quantitative genetic research which estimate heritability, shared and nonshared family environment – at the high and low ends of intelligence – as well as the heritability of group differences for general cognitive ability and specific cognitive abilities. We discuss the molecular genetic methods and mechanisms contributing to cognitive ability and suggest how epigenetic factors may operate. Quantitative and molecular genetic studies that include endophenotypes representing intelligence at a level closer to the genotype, are also included. This last group of studies represent a relatively new area of work that builds on and extends the extensive groundwork established by classic quantitative genetic studies of behavior.     

Genetic Influences on Activity Level in Early Childhood: Do Situations Matter?

Although genetic influences on individual differences in activity level (AL) are well documented, few studies have considered the etiology of AL from a contextual perspective. In the present study, cross-situational and context-specific genetic effects on individual differences in AL at age 2 were examined. The AL of 312 twin pairs (144 monozygotic and 168 dzygotic) was mechanically assessed with actigraphs in the home and in laboratory test and play situations. AL displayed significant genetic variance in all 3 situations. Moreover, actigraph scores significantly correlated across situations. Multivariate genetic model-fitting analyses found that the observed cross-situational continuity in AL was due entirely to genetic factors. Situational differences in AL arise from genetic, shared environmental, and nonshared environmental influences.     

Genes, environment, and dyslexia the 2005 Norman Geschwind memorial lecture

This article presents an overview of some methods and results from our continuing studies of genetic and environmental influences on dyslexia, and on individual differences across the normal range that have been conducted over the past 25 years in the Colorado Learning Disabilities Research Center (CLDRC) and in related projects. CLDRC investigators compare the similarities of identical twin pairs who share all their genes and fraternal twins who share half their segregating genes to assess the balance of genetic, shared family environment, and nonshared environment influences on dyslexia and on individual differences across the normal range. We have learned that among the children we have studied in Colorado, group deficits in reading (dyslexia) and individual differences in reading across the normal range are primarily due to genetic influences, and these genetic influences are often shared with some of the same genetic influences on deficits and individual differences in language and ADHD. We have also learned from our molecular-genetic linkage studies that there are regions on several chromosomes likely to contain genes that influence dyslexia. Several specific genes within these regions have been tentatively identified through molecular-genetic association analyses, but much more research is needed to understand the pathways among specific genes, regions of noncoding DNA that regulate the activity of those genes, the brain, and dyslexia. I conclude with a discussion of our research on individual differences in early reading development, on the role of early learning constraints in dyslexia, and on how genetic influences are expressed through their interaction and correlation with the environment.     

Evidence for Common Etiological Influences on Early Literacy Skills in Kindergarten

Understanding how the etiology of print awareness and phonological awareness are related to the etiology of decoding can provide insights into the development of word reading. To address this issue, we examined the degree of overlap among etiological influences of prereading skills in 1,252 twin pairs in kindergarten. Genetic, shared environmental, and nonshared environmental factors were significant for all three literacy phenotypes. The majority of genetic and shared environmental influence on decoding was due to common factors that included print awareness and phonological awareness. Notably, only a single genetic factor contributed to all three literacy phenotypes, but there was additional shared environmental influence common to phonological awareness and decoding. Findings suggest commonalities in the etiology of prereading literacy skills that could inform work on the development of reading skill.     

Intellectual interest mediates gene × socioeconomic status interaction on adolescent academic achievement

Recent studies have demonstrated that genetic influences on cognitive ability and academic achievement are larger for children raised in higher socioeconomic status (SES) homes. However, little work has been done to document the psychosocial processes that underlie this Gene × Environment interaction. One process may involve the conversion of intellectual interest into academic achievement. Analyses of data from 777 pairs of 17-year-old twins indicated that Gene × SES effects on achievement scores can be accounted for by stronger influences of genes for intellectual interest on achievement at higher levels of SES. These findings are consistent with the hypothesis that higher SES affords greater opportunity for children to seek out and benefit from learning experiences that are congruent with their genetically influenced intellectual interests.     

Genetic and Environmental Links Between Natural Language Use and Cognitive Ability in Toddlers

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 language use, assessed through conversational language samples, and nonverbal cognition in a sample of 3‐year‐old twins (N = 281 pairs). Significant genetic and nonshared environmental influences were found for nonverbal cognitive ability and language measures, including mean length of utterance and number of different words, as well as significant genetic covariance between cognitive ability and both language measures.     

Genetic and Environmental Influences on Perceptions of Self-Worth and Competence in Adolescence: A Study of Twins, Full Siblings, and Step-Siblings

Although it is generally assumed that the origins of adolescents' perceptions of self-competence lie in shared family environmental influences, the contributions of nonshared environmental or genetic influences have not been explored. We investigated sibling resemblance for perceived competence and self-worth in 720 adolescent pairs aged 10 to 18 years, using a twin, full sibling, and step-sibling design. Our goals were to assess the magnitude of shared and nonshared environmental influences and to disentangle resemblance due to shared genetic heritage from that due to shared environmental experiences. Shared environment was not significant for any of the scales. 4 of the subscales showed significant genetic influence: scholastic, social, physical, and athletic competence. We also explored possible sources of genetic influences on perceived competence. Bivariate models revealed common genetic variance between scholastic competence and vocabulary and social competence and sociability. These measures, however, did not account for all of the genetic variance in perceived social and scholastic competence.     

Genetic and environmental influences on rapid naming and reading ability: A twin study

The present study assesses the genetic and environmental etiologies of reading, rapid naming (RN), and their covariation by fitting multivariate structural equation models to data from 587 twin pairs in which at least one member of the pair exhibited reading difficulties (low-range) and from 360 control (normal-range) twin pairs who were tested in the Colorado Learning Disabilities Research Center. Results from a bivariate phenotypic analysis with two hypothesized latent factors, READ and RN, indicated that the correlation between reading and rapid naming performance for the low-range sample was significantly higher than that of the normal-range sample. When this model was partitioned to include estimates of genetic, shared environmental, and nonshared environmental influences, resulting heritability estimates did not differ significantly for the low-range and normal-range samples for either READ or RN. However, similar to the phenotypic correlation, the genetic correlation between the READ and RN latent factors could not be equated for the two groups. Thus, the etiology of the relationship between reading performance and rapid naming may differ for children with reading difficulties and normally-achieving readers. Moreover, these results support previous findings that the best predictors of reading skills may differ for samples of children with normal reading levels and those with reading difficulties.     

Chinese mindset: theories of intelligence,goal orientation and academic achievement in Hong Kong students

The purpose of the present study was to examine the relationship between theories of intelligence and goal orientations, and their joint connections to students’ academic achievement in the Chinese cultural context. A total of 418 university students in Hong Kong participated in the present study. The survey was administered to collect information on students’ beliefs about their goal orientations, theories of intelligence and their college grade point averages. The data were analysed using structural equation modelling. The results suggest that beliefs in the incremental theory of intelligence contribute to students’ academic achievements by facilitating their endorsement of mastery goals and performance-approach goals. Students’ performance-avoidance goals have a negative association with academic success. Cultural factors and considerations are addressed to clarify further the culture-specific findings.     

Word reading and reading comprehension: stability, overlap and independence

Longitudinal twin data were analyzed to investigate the etiology of the stability of genetic and environmental influences on word reading and reading comprehension, as well as the stability of those influences on their relationship. Participating twin pairs were initially tested at a mean age of 10.3 years, and retested approximately five years later. Both word reading and comprehension were found to be highly stable, and genetic influences were primarily responsible for that stability. In contrast to studies with younger participants, no unique genetic influences were observed at follow-up testing in this older sample. High genetic correlations were obtained between word reading and reading comprehension at both ages, indicating common genetic influences. However, significant genetic influence on comprehension was also observed, independent of that on word reading. Although the phenotypic relation between the two measures appeared to decline across time, the genetic etiology of this relation was highly stable.     

Intelligence quotient,short-term memory and study habits as academic achievement predictors of elementary school: A follow-up study

Few studies have explored the differential contribution of general intelligence, short-term memory and study habits has on academic achievement during elementary school, especially during a two-year follow-up. The aim of this study is to determine whether there is a relationship between intelligence quotient (IQ), short-term memory and study habits and their ability to predict the academic achievement of children in elementary school (74 pupils aged 8–9 years old). The instruments used are the General and Factorial Intelligence Test (GFI-3 revised), the Yuste Memory Test (MY), the Study Habits and Techniques Questionnaire (SHTQ) and the average score obtained in the final exams in both 3rd and 4th grade. IQ, short-term memory and study habits are significantly related to academic achievement. These variables can predict 56–59 % (p < .001) of the variability of academic achievement. The study concludes that IQ and study habits are two significant predictor variables of academic achievement.     

The Relationship between Intelligence,Approaches to Learning and Academic Achievement

Three different tests of intelligence and the Approaches and Study Skills Inventory for Students were administered to 89 Norwegian undergraduate psychology students. The purpose was to investigate the relationship between intelligence, approaches to learning and academic achievement. Factor analysis supported a one-factor solution of the three intelligence tests as an expression of general intelligence. No relationship between general intelligence and approaches to learning was observed. The WAIS vocabulary test of intelligence and the surface approach to learning were negatively correlated. The WAIS vocabulary test of intelligence and the surface approach to learning predicted academic achievement. A curvilinear relationship between surface approach and academic achievement was observed. Multiple regression analysis showed interaction effects between deep-strategic and surface-strategic approaches to learning as predictors of academic achievement. The findings support the construct validity of approaches to learning due to its independence of intelligence.     

Relationship between Students' Perceptions of School Environment,Their Satisfaction with School and Perceived Academic Achievement: An International Study

During the last decades numerous studies have been conducted with the aim of finding predictors of an effective school measured in terms of the average level of the students' academic achievement. Few of these studies have examined how the students' perception of their work environment at school influences their academic achievement. The present article applies theory and findings from research on the adult work environment to the daily school life of children and adolescents. The analyses are based on self-reported data from the "Health Behaviour in School-aged Children Survey" (the HBSC study), using data from countries in both Eastern and Western Europe. Data from 11, 13 and 15 year old students in Finland, Latvia, Norway and Slovakia are used. The findings suggest that the most important psychosocial school setting predictors of students' perception of their academic achievement are that they feel satisfied with school, that they feel the teachers do not expect too much of them, and that they have a good relationship with their fellow students. The findings imply that interventions which enhance the students' satisfaction with school are likely to improve their achievement as well.     

Measured Environmental Influences on Early Reading: Evidence From an Adoption Study

Many studies have examined the relationship between environmental processes and literacy outcomes. However, nearly all of this research has examined biologically related family members living together, thus confounding genetic and environmental influences. The purpose of this study was to address this issue using a sample of 262 adopted children and their families. Children were assessed in their homes on a 90-min battery of reading-related outcome measures. Parents reported on their educational attitudes, book reading practices, levels of involvement in homework, and their children's interest in reading-related activities. Multilevel modeling results suggest that aspects of the family environment were associated with child reading-related outcomes, a finding that cannot be attributed to shared genes between parents and their children.     

An Examination of the Effect of Elementary School Size on Student Academic Achievement

Prior studies that have investigated the relationship between school size and student academic achievement have produced conflicting results. For example, some studies found a positive relationship between school size and student achievement; other studies found that the relationship is negative. Typically, however, these past studies have not accounted for the influence of student ability in their analysis of the impact of school size on student achievement. The purpose of this paper is to examine the effect of school size on student achievement while accounting for student ability, among other variables. The results reported in this paper suggest that school size has a nonlinear relationship with respect to student achievement. Thus, there is an optimal school size with respect to the maximization of student achievement.     

高中生情绪智力与学业成绩的关系研究

为了探究高中生情绪智力的发展现状以及情绪智力与学业成绩的关系,本研究使用问卷调查法,采用整群随机抽样的方法,对342名高中生的情绪智力和学业成绩进行调查研究。结果表明:高中生的整体情绪智力发展处于中高等水平,但是情绪智力的八个因子发展不平衡。整体的情绪智力与学业成绩存在显著正相关,情绪智力各因子与学业成绩的相关模式不同,而且各个因子对学业成绩的预测力不同。据此,可以通过针对性的培训,提高高中生的情绪智力,从而提高他们的学习成绩。     

Interactional models of learning disabilities: Evidence from students entering foster care

Children are increasingly entering foster care due to primary or secondary neglect in the home environment. They provide a unique opportunity to examine the relationship between learning and extrascholastic environments. Achievement and intelligence scores were obtained for 3483 school‐age children during the first 30 to 60 days of foster care placement. Results showed average to low‐average mean achievement and IQ, with primary academic deficits in basic skill areas. One or more severe (≥1.75 SD) regressed discrepancies was found for 25.4% of children, and 76.6% showed one or more areas of academic underachievement (≤25th percentile). Results are interpreted as supporting interactional models of learning disability etiology that recognize environmental, neurologic, instructional, and behavioral variables. © 2001 John Wiley & Sons, Inc.