Reading skills in early readers: genetic and shared environmental influences

The present study combined parallel data from the Northeast-Northwest Collaborative Adoption Projects (N2CAP) and the Western Reserve Reading Project (WRRP) to examine sibling similarity and quantitative genetic model estimates for measures of reading skills in 272 school-age sibling pairs from three family types (monozygotic twins, dizygotic twins, and unrelated adoptive siblings). The study included measures of letter and word identification, phonological awareness, phonological decoding, rapid automatized naming, and general cognitive ability. Estimates of additive genetic effects and shared environmental effects were moderate and significant. Furthermore, shared environmental effects estimated in twins were generally similar in magnitude to adoptive sibling correlations, suggesting highly replicable estimates across different study designs.     

Training of component reading skills

Fifteen reading-disabled boys, classified according to reading subskill deficits, formed three subgroups: Oral Reading, Associative, and Sequential. On the rationale that training procedures emphasizing accuracy and speed of response to letters, syllables, and words would improve reading skills, the children were trained daily for two and one-half months. Two schedules of testing and training allowed for an untrained control group and a follow-up group. The results indicated that the computer-assisted training procedures were not only effective in improving component reading skills, but in addition there was a transfer of training to achievement measures of reading word recognition. This study lends support to the hypothesis that training according to subgroup classification, using training procedures which incorporate an application of the automaticity theory and a combination of task-analytic and process-oriented models, is an effective training approach for reading-disabled children. This research was funded by a grant from the Toronto Hospital for Sick Children Foundation, Toronto, Canada, and a scholarship from the Natural Science and Engineering Research Council, Ottawa, Canada.     

Genetic and environmental influences on writing and their relations to language and reading

Identical and fraternal twins (N?=?540, age 8 to 18 years) were tested on three different measures of writing (Woodcock-Johnson III Tests of Achievement—Writing Samples and Writing Fluency; Handwriting Copy from the Group Diagnostic Reading and Aptitude Achievement Tests), three different language skills (phonological awareness, rapid naming, and vocabulary), and three different reading skills (word recognition, spelling, and reading comprehension). Substantial genetic influence was found on two of the writing measures, writing samples and handwriting copy, and all of the language and reading measures. Shared environment influences were generally not significant, except for Vocabulary. Non-shared environment estimates, including measurement error, were significant for all variables. Genetic influences among the writing measures were significantly correlated (highest between the speeded measures writing fluency and handwriting copy), but there were also significant independent genetic influences between copy and samples and between fluency and samples. Genetic influences on writing were significantly correlated with genetic influences on all of the language and reading skills, but significant independent genetic influences were also found for copy and samples, whose genetic correlations were significantly less than 1.0 with the reading and language skills. The genetic correlations varied significantly in strength depending on the overlap between the writing, language, and reading task demands. We discuss implications of our results for education, limitations of the study, and new directions for research on writing and its relations to language and reading.     

Disentangling genetic and environmental influences on early language development: The interplay of genetic propensity for negative emotionality and surgency,and parenting behavior effects on early language skills in an adoption study

Parenting and children's temperament are important influences on language development. However, temperament may reflect prior parenting, and parenting effects may reflect genes common to parents and children. In 561 U.S. adoptees (57% male) and their birth and rearing parents (70% and 92% White, 13% and 4% African American, and 7% and 2% Latinx, respectively), this study demonstrated how genetic propensity for temperament affects language development, and how this relates to parenting. Genetic propensity for negative emotionality inversely predicted language at 27 months (β = −.15) and evoked greater maternal warmth (β = .12), whereas propensity for surgency positively predicted language at 4.5 years (β = .20), especially when warmth was low. Parental warmth (β = .15) and sensitivity (β = .19) further contributed to language development, controlling for common gene effects.     

Chinese-English biscriptal reading: cognitive component skills across orthographies

This study examined the associations of Chinese visual-orthographic skills, phonological awareness, and morphological awareness to Chinese and English word reading among 326 Hong Kong Chinese second- and fifth-graders learning English as a second language. Developmentally, tasks of visual-orthographic skill, phonological awareness, and morphological awareness improved with age. However, the extent to which each of the constructs explained variance in Chinese and English word reading was stable across age but differed by orthography. Across grades, visual-orthographic skills and morphological awareness, but not phonological awareness, were uniquely associated with Chinese character recognition with age and nonverbal IQ statistically controlled. In contrast, Chinese visual-orthographic skills and phonological awareness, but not morphological awareness, accounted for unique variance in English word reading even with the effects of Chinese character recognition and other reading-related cognitive tasks statistically controlled. Thus, only visual-orthographic skills appeared to be a consistent factor in explaining both Chinese and English word reading, perhaps in part because Hong Kong Chinese children are taught in school to read both Chinese and English using a “look and say” strategy that emphasizes visual analysis for word recognition. These findings extend previous research on Chinese visual-orthographic skills to English word reading and underscore commonality and uniqueness in bilingual reading acquisition.     

Beyond phonological skills: broader language skills contribute to the development of reading

This paper reports a study that followed the development of reading skills in 72 children from the age of 8.5 to 13 years. Each child was administered tests of reading, oral language, phonological skills and nonverbal ability at time 1 and their performance on tests of reading comprehension, word recognition, nonword decoding and exception word reading was assessed at time 2. In addition to phonological skills, three measures of non‐phonological oral language tapping vocabulary knowledge and listening comprehension were unique concurrent predictors of both reading comprehension and word recognition at time 1. Importantly, all three measures of oral language skill also contributed unique variance to individual differences in reading comprehension, word recognition and exception word reading four and a half years later, even when the autoregressive effects of early reading skill were controlled. Moreover, the extent to which a child's word recognition departed from the level predicted from their decoding ability correlated with their oral language skills. These findings suggest that children's oral language proficiency, as well as their phonological skills, influences the course of reading development.     

Genetic and environmental influences on reading and listening comprehension

We report preliminary behaviour genetic analyses of reading and listening comprehension from The Colorado Learning Disabilities Research Center. Although the twin sample with these new measures is still of limited size, we find substantial, and significant, genetic influences on individual differences in both reading and listening comprehension. In addition, word recognition and listening comprehension each accounted for significant independent genetic influences on reading comprehension. Together, they accounted for all the genetic influence on reading comprehension, indicating a largely genetic basis for the ‘simple model’ of individual differences in reading comprehension proposed by Hoover and Gough (1990) .     

Genetic influences in different aspects of language development: the etiology of language skills in 4.5-year-old twins

The genetic and environmental etiologies of diverse aspects of language ability and disability, including articulation, phonology, grammar, vocabulary, and verbal memory, were investigated in a U.K. sample of 787 pairs of 4.5-year-old same-sex and opposite-sex twins. Moderate genetic influence was found for all aspects of language in the normal range. A similar pattern was found at the low end of the distribution with the exception of two receptive measures. Environmental influence was mainly due to nonshared factors, unique to the individual, with little influence from shared environment for most measures. Genetic and environmental influences on language ability and disability are quantitatively and qualitatively similar for males and females.     

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 impact of shared book reading on children's language skills: A meta-analysis

Shared book reading is thought to have a positive impact on young children's language development, with shared reading interventions often run in an attempt to boost children's language skills. However, despite the volume of research in this area, a number of issues remain outstanding. The current meta-analysis explored whether shared reading interventions are equally effective (a) across a range of study designs; (b) across a range of different outcome variables; and (c) for children from different SES groups. It also explored the potentially moderating effects of intervention duration, child age, use of dialogic reading techniques, person delivering the intervention and mode of intervention delivery.Our results show that, while there is an effect of shared reading on language development, this effect is smaller than reported in previous meta-analyses ($\bar{g}$ = 0.194, p = .002). They also show that this effect is moderated by the type of control group used and is negligible in studies with active control groups ($\bar{g}$ = 0.028, p = .703). Finally, they show no significant effects of differences in outcome variable (ps ≥ .286), socio-economic status (p = .658), or any of our other potential moderators (ps ≥ .077), and non-significant effects for studies with follow-ups ($\bar{g}$ = 0.139, p = .200). On the basis of these results, we make a number of recommendations for researchers and educators about the design and implementation of future shared reading interventions.     

The component skills underlying reading fluency in adolescent readers: a latent variable analysis

This study investigated the component skills underlying reading fluency in a heterogeneous sample of 527 eighth grade students. Based on a hypothetical measurement model and successive testing of nested models, structural equation modeling revealed that naming speed, decoding, and language were uniquely associated with reading fluency. These findings suggest that the ability to access and retrieve phonological information from long-term storage is the most important factor in explaining individual differences in reading fluency among adolescent readers. The ability to process meaning and decode novel words was smaller but reliable contributors to reading fluency in adolescent readers.     

Relations between early reading and writing skills among Spanish-speaking language minority children

Although there is a growing body of literature on the development of reading skills of Spanish-speaking language minority children, little research has focused on the development of writing skills in this population. This study evaluated whether children’s Spanish early reading skills (i.e., print knowledge, phonological awareness, oral language) were related to their Spanish and English early writing skills using a sample of 554 children whose home language was Spanish. Multivariate regression analyses with simultaneous outcomes (Spanish and English invented spelling skills) were conducted to evaluate whether children’s early reading and writing skills were related across languages. Results indicated that children’s print knowledge and phonological awareness skills, but not oral language skills, were significantly related to their Spanish and English invented spelling skills. Spanish early literacy skills were not differentially related to Spanish and English reading and writing skills. The magnitude of the relations between print knowledge and oral language skills and children’s invented spelling skills varied as a function of child age; however, the magnitude of the relation between phonological awareness and invented spelling skills did not differ as a function of child age. Furthermore, results suggested that language minority children’s early reading and writing skills are related but distinct constructs and that children may be able to apply information gained from learning to read and write in their first language when learning to write in their second language.     

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.     

文化能力对目的语阅读理解的影响

影响目的语阅读理解的因素很多.本文以交易阅读模型的理论为基础,在充分考虑阅读理解本质特征的前提下,提出文化能力(广义)对目的语阅读理解水平起着决定性的作用,并从文化能力的组成部分--目的语语言能力、背景知识水平及母语呈现水平三方面阐述其对阅读理解的巨大影响.     

Word reading and word spelling in French adult literacy students: the relationship with oral language skills

We analysed word reading and spelling in French adults with low levels of literacy (A‐IL). As well as examining phonological and lexical processes, we explored the relationship between literacy and oral language skills. Fifty‐two adult literacy students were compared with reading level‐matched pupils in Years 1–3 of primary school on reading tasks (pseudoword reading, word reading, text comprehension), spelling tasks (pseudoword spelling, text dictation) and oral language tasks. A‐IL scored the same as children on word reading and spelling but less well on pseudoword reading and spelling. They also produced fewer phonologically acceptable errors in the dictation. Regarding oral language skills, as a group A‐IL encountered greater difficulty in phonology than in morphosyntax and semantics, and correlations revealed strong relationships between literacy levels and oral skills, particularly in the domain of phonology. Within their group, however, A‐IL displayed several distinct language profiles. These could reflect different risk factors leading to functional illiteracy and are discussed regarding the cognitive and environmental causes of impaired reading acquisition.     

Environmental and social influences on reading skills as indexed by brain and behavioral responses

The research described in this article uses findings from longitudinal studies involving electrophysiological and behavioral assessments of infants and young children. Event-Related Potentials (ERPs) offer a basis for understanding how areas of the brain react to specific stimuli that are thought to play a role in the development of language and reading abilities. In this paper, we review a series of studies that identify markers in the ERPs that are related to differences in the development of language and reading skills. In addition, there is compelling evidence supporting the role of the home environment and other variables that influence the intellectual level of the child’s environment (e.g., SES, parental IQ, parenting practices, family activities) in the development of language and reading in preschool and school-aged children. In this paper, measures of these environmental variables are linked with predictions of language and reading skill development. Efforts to integrate information about the influence of the environment on brain responses to better understand the development of early language and reading skills are described.     

Persistence of phonological processing deficits in college students with dyslexia who have age-appropriate reading skills

This study investigated the phonological processing skills of university students with dyslexia. Fifty-nine students participated in this study: 28 with reading disabilities based on recent psychological assessments and a history of early and persistent reading problems; and 31 controls. The two groups did not differ on estimates of verbal and nonverbal abilities. The dyslexia group performed significantly less well on standardized measures of reading and spelling. However, the dyslexia group scores on these measures fell within the average range. The main dependent variables were subsumed under three areas of phonological processing: phonological awareness, phonological recoding in lexical access, and phonological recoding in working memory. The control group performed significantly better on all phonological processing measures, particularly those measures involving accuracy and response times. Despite age-appropriate performances on standardized reading and spelling measures, phonological processing deficits persisted in the dyslexia group. These findings support the causal role of phonological awareness in the acquisition of reading skills and indicate that differences in phonological processing skills are still evident in a sample of university students with dyslexia compared a group matched on age and education.     

The role of sentence recall in reading and language skills of children with learning difficulties

The present study explores the relationship between sentence recall and reading and language skills in a group of 7–11-year-old children with learning difficulties. While recent studies have found that performance on sentence recall tasks plays a role in learning, it is possible that this contribution is a reflection of shared resources with working memory. In order to investigate whether sentence recall was uniquely associated with reading and language skills, differences associated with IQ and working memory capacity were statistically controlled. A sample of 72 children was tested on measures of verbal complex memory, verbal short-term memory, sentence recall, expressive vocabulary, verbal and performance IQ, reading and language skills. Both sentence recall and verbal complex memory shared unique links with reading skill, and sentence recall was uniquely associated with language skills. This finding indicates that resources in long-term memory also play an important diagnostic role in reading and language abilities. The implications for educational practice are discussed.     

Literacy skills in children with cochlear implants: the importance of early oral language and joint storybook reading

The goal of this study was to longitudinally examine relationships between early factors (child and mother) that may influence children's phonological awareness and reading skills 3 years later in a group of young children with cochlear implants (N = 16). Mothers and children were videotaped during two storybook interactions, and children's oral language skills were assessed using the "Reynell Developmental Language Scales, third edition." Three years later, phonological awareness, reading skills, and language skills were assessed using the "Phonological Awareness Test," the "Woodcock-Johnson-III Diagnostic Reading Battery," and the "Oral Written Language Scales." Variables included in the data analyses were child (age, age at implant, and language skills) and mother factors (facilitative language techniques) and children's phonological awareness and reading standard scores. Results indicate that children's early expressive oral language skills and mothers' use of a higher level facilitative language technique (open-ended question) during storybook reading, although related, each contributed uniquely to children's literacy skills. Individual analyses revealed that the children with expressive standard scores below 70 at Time 1 also performed below average (<85) on phonological awareness and total reading tasks 3 years later. Guidelines for professionals are provided to support literacy skills in young children with cochlear implants.