Why does parental language input style predict child language development? A twin study of gene-environment correlation

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.

Novel word learning ability in 24-month-olds: The interactive role of mother's work status and education level

Using both online and offline measures, this study investigates how maternal education and work status (stay-at-home, part-time, full-time) are jointly associated with infants' word learning ability and vocabulary size. One hundred 24-month-old infants completed a lab-based mutual exclusivity task, which assesses infants' novel word learning ability. Caregivers reported infants' productive vocabulary size using the MCDIs. There was no evidence for an association between infants' productive vocabulary size and maternal education, maternal work status, or their interaction. However, infants' novel word learning ability was significantly related to both maternal factors and their interaction. The positive association between maternal education and word learning performance was attenuated for infants of part-time and full-time working mothers compared to infants with at home mothers. These findings suggest that using real-time measures with high task demand may better capture developmental differences in infants and expand our understanding of maternal factors contributing to early language development.

Associations between responsive parental behaviours in infancy and toddlerhood, and language outcomes at age 7 years in a population-based sample

BACKGROUND

A wealth of evidence supports the important role high-quality parent-child interactions play in children's early language acquisition. However, the impact on later language outcomes remains unclear.

AIMS

To examine the associations between responsive parental behaviours across the early years and child language outcomes at age 7 years with families from an Australian longitudinal cohort study (N = 1148, 50% female).

METHODS & PROCEDURES

At child ages 12, 24 and 36 months, parents completed a self-report measure of responsive parental behaviours. Child language was directly assessed at age 7 using the Clinical Evaluation of Language Fundamentals, 4th edition (CELF-4), Australian Standardisation. Linear regression was used to examine associations between responsive parental behaviours from 12 to 36 months (consistently high, inconsistent and consistently low responsive parental behaviours at the three time points) and language scores at age 7 years. Adjusted models were run, including the following potential confounders: child sex; birth weight; birth order; maternal education; socio-economic disadvantage; non-English-speaking background; family history of speech-language problems; mother's vocabulary score; maternal mental health score; and mother's age at birth of child. A final adjusted model was run, including the potential confounder variables as well as adjusting for children's earlier language skills.

OUTCOMES & RESULTS

Linear regression results showed children with parents who rated high on responsive parental behaviours at all three time points had higher mean language scores at age 7 than children whose parents reported low responsive parental behaviours across early childhood. This association attenuated after adjusting for earlier child language skills.

CONCLUSIONS & IMPLICATIONS

Findings support the consistent use of responsive parental behaviours across the very early years of childhood to support long-term language outcomes. Findings also suggest that models of surveillance and support which monitor and assist families at multiple time-points over the early years are likely to be most effective for preventing ongoing language difficulties.

WHAT THIS PAPER ADDS

What is already known on this subject There is extensive evidence consistently demonstrating the important contribution of aspects of parent-child interaction, specifically responsive parental behaviours, to children's language development. What this paper adds to the existing knowledge Understanding the cumulative benefit of responsive parent-child interactions across the very early years may help to inform preventive interventions and service delivery models for supporting young children's language development. This study demonstrates in a large, population-based cohort the contribution of consistency of responsive parental behaviours during infancy and toddlerhood to school-age language outcomes, accounting for other child, family and environmental factors. Capturing regular parent behaviours via self-report during the early years may be a more efficient and less costly method than parent-child interaction observations to monitor the home language-learning environment during routine developmental checks. What are the potential or actual clinical implications of this work? Findings support the need for surveillance of children and families in the early years, ensuring that intervention occurs when families need it most, that is, support is responsive to changing needs and that nuanced advice and support strategies are provided to activate positive developmental cascades. Capturing both parent behaviours and child language may assist clinicians to identify those families who may benefit from parent-child interaction intervention.

Adversity Exposure, Syntax, and Specific Language Impairment: An Exploratory Study

PURPOSE

Children exposed to adversity (e.g., chronic poverty, traumatic events, and maltreatment) are at increased risk for performing below age expectations on norm-referenced language assessments, but it is unknown whether the risk is higher for specific language impairment (SLI). This exploratory study investigated whether adversity exposure is associated with reduced grammar knowledge and SLI.

METHOD

The syntax subtest of the Diagnostic Evaluation of Language Variation-Norm-Referenced (DELV-NR) assessment was administered to 30 school-age children with known histories of adversity exposure. Their primary caregiver also completed a comprehensive adversity exposure measure, which captured adverse event type, frequency, chronicity, and severity. Analyses included t tests, correlations, Mann-Whitney U tests, and chi-square.

RESULTS

Overall, the sample performed below age expectations on the DELV-NR Syntax subtest, and a higher percentage of participants (20%) met diagnostic criteria for SLI than expected. The SLI and typical language (TL) groups did not significantly differ in adversity dosage, frequency, chronicity, or severity; however, participants in the SLI group were 1.46 times more likely to have experienced physical trauma than the participants in the TL group.

CONCLUSIONS

Children with known histories of adversity exposure presented with grammatical deficits and SLI more often than expected based on the DELV-NR normative sample; however, features of the adverse event did not associate with SLI status except for exposure to physical trauma (e.g., physical abuse and victimization). Future research is needed to investigate the prevalence and potential causal pathways of SLI in this population.

SUPPLEMENTAL MATERIAL

https://doi.org/10.23641/asha.20483706.

Cross-Sectional and Longitudinal Associations Between Quality of Parent-Child Interaction and Language Ability in Preschool-Age Children With Developmental Language Disorder

PURPOSE

This study explores whether the quality of parent-child interaction is associated with language abilities cross-sectionally and longitudinally up to preschool-age among children with developmental language disorder (DLD).

METHOD

Participants were 97 monolingual children with DLD and their parents from the Helsinki Longitudinal SLI study, HelSLI (baseline, age in years;months, M = 4;3, SD = 0;10), of which 71 pairs were followed longitudinally (age in years;months, M = 6;6, SD = 0;5). Video recordings from three play sessions were scored for child, parent, and dyadic behavior using Erickson's sensitivity scale protocol and mutually responsive orientation at baseline. Children's expressive and receptive language and language reasoning ability were assessed at baseline, and expressive and receptive language were assessed at follow-up.

RESULTS

At baseline, engaged child behavior, parent's supportive guidance, and fluent and attuned dyadic behavior were associated with better receptive language ability, and engaged child behavior and dyadic synchrony were positively associated with language reasoning ability in 3- to 6-year-olds. The child's positive engagement and fluent and attuned dyadic behavior at baseline were associated with better expressive and receptive language abilities at follow-up in 6- to 7-year-olds, respectively.

CONCLUSIONS

Fluent and attuned dyadic behavior is associated with better receptive language ability in preschool-age children. Parent behavior alone was not associated with language ability. A connected and mutually attuned parent-child relationship could be a protective factor for language development for children with DLD.

Predicting Chinese Preschoolers’ Acquisition of Aspect Markers: A Corpus-Based Study

This study explored the patterns and predictors of aspect marker acquisition of Chinese preschoolers speaking Mandarin Chinese as their first language (L1). Based on a corpus drawn from 157 preschoolers from Beijing, China, this study set out to explore (1) the developmental pattern of aspect marker acquisition; (2) the interactional pattern between grammatical aspect markers and lexical aspects; (3) the production of temporal adverbs with aspect markers; and (4) the predictors of aspect marker acquisition. The main research findings included the following: (1) the Jonckheere–Terpstra test revealed an age-related increase in children’s production of aspect markers, and in particular, there was a significant increase in grammatical aspect markers and lexical aspect subclasses from age 4;6 (Year; Month) onwards; (2) the Friedman’s ANOVAs indicated that -LE was frequently used in combination with most of the lexical aspect subclasses, among them the achievement was the most frequently co-occurring subclass, while the activities came second; (3) a series of Chi-square tests showed that using temporal adverbs in combination with aspect markers became increasingly common among older children; (4) the hierarchical regression analysis identified children’s preschooling experience as a significant predictor of their early aspectual development, after controlling for the other variables.

Understanding the Impact of Child, Intervention, and Family Factors on Developmental Trajectories of Children with Hearing Loss at Preschool Age: Design of the AChild Study

Children with hearing loss and their families represent a large variety with regard to their auditory, medical, psychological, and family resource characteristics. Despite recent advances, developmental outcomes are still below average, with a significant proportion of variety remaining unexplained. Furthermore, there is a lack of studies including the whole diversity of children with hearing loss. The AChild study (Austrian Children with Hearing Impairment—Longitudinal Databank) uses an epidemiological longitudinal design including all children living in Upper and Lower Austria with a permanent uni- or bilateral hearing loss below the age of 6 years, irrespective of additional disabilities, family language, and family resources. The demographic characteristics of the first 126 children enrolled in the study showed that about half of the children are either children with additional disabilities (31%) and/or children not growing up with the majority language (31.7%) that are usually excluded from comprehensive longitudinal studies. AChild aims for a characterization of the total population of young children with hearing loss including developmental outcomes. Another goal is the identification of early predictors of developmental trajectories and family outcomes. In addition to child-related predictors the examination of family–child transactions malleable by family-centred early intervention is of particular interest. The study is designed as participatory including parent representation atall stages. Measures have been chosen, following other large population-based studies in order to gain comparability and to ensure international data pooling.

‘Making the most of together time’: development of a Health Visitor–led intervention to support children’s early language and communication development at the 2–2½-year-old review

Background

Early interventions to support young children’s language development through responsive parent–child interaction have proven efficacy but are not currently delivered universally. A potential universal delivery platform is the Health Visitor (HV)–led 2–2½-year-old review in England’s Healthy Child Programme. It is unclear if it is feasible to offer such interventions through this platform. We report an intervention development process, including extensive stakeholder consultation and co-design which aimed to develop an acceptable, feasible and equitable early language intervention for delivery in this context.

Methods

The study involved five phases including 13 stakeholder co-design workshops with 7 parents and 39 practitioners (HVs, early years practitioners and speech and language therapists): (1) Identification of existing intervention evidence, (2) qualitative review of intervention studies extracting candidate target behaviours for intervention and intervention techniques, (3) co-design workshops with parents and practitioners examining acceptability, barriers and enablers to those behaviours and techniques (particular attention was paid to diverse family circumstances and the range of barriers which might exist), (4) findings were analysed using COM-B and theoretical domains frameworks and a prototype intervention model designed, and (5) co-design workshops iteratively refined the proposed model.

Results

Practitioners were committed to offering language intervention at the 2–2½-year-old review but were not sure precisely how to do so. Parents/caregivers wanted to be proactive and to have agency in supporting their own children and to do this as soon as possible. For equitable intervention, it must be proportionate, with higher ‘intensity’ for higher levels of disadvantage, and tailored, offering differing approaches considering the specific barriers and enablers, assets and challenges in each family. The importance and potential fragility of alliances between parent/caregiver and practitioner were identified as key, and so, strategies to engender successful collaborative partnership are also embedded in intervention design.

Conclusion

It is possible to develop a universal intervention which parents and practitioners judge would be acceptable, feasible and equitable for use at the 2–2½-year review to promote children’s language development. The result is one of the most explicitly developed universal interventions to promote children’s language development. Further development and piloting is required to develop materials to support successful widespread implementation.

Supplementary Information

The online version contains supplementary material available at 10.1186/s40814-022-00978-5.

Developing Preschool Language Surveillance Models - Cumulative and Clustering Patterns of Early Life Factors in the Early Language in Victoria Study Cohort

BACKGROUND

Screening and surveillance of development are integral to ensuring effective early identification and intervention strategies for children with vulnerabilities. However, not all developmental skills have reliable screening processes, such as early language ability.

METHOD

We describe how a set of early life factors used in a large, prospective community cohort from Australia are associated with language abilities across the preschool years, and determine if either an accumulation of risk factors or a clustering of risk factors provide a feasible approach to surveillance of language development in preschool children.

RESULTS

There were 1,208 children with a 7-year language outcome. The accumulation of early life factors increased the likelihood of children having low language skills at 7-years. Over a third of children with typical language skills (36.6%) had ≤ two risks and half of the children with low language (50%) had six or more risks. As the number of factors increases the risk of having low language at 7-years increases, for example, children with six or more risks had 17 times greater risk, compared to those with ≤ two risks. Data collected from 1,910 children at 8- to 12-months were used in the latent class modeling. Four profile classes (or groups) were identified. The largest group was developmentally enabled with a supportive home learning environment (56.2%, n = 1,073). The second group was vulnerable, both developmentally and in their home learning environment (31.2%, n = 596); the third group was socially disadvantaged with a vulnerable home learning environment (7.4%, n = 142); the final group featured maternal mental health problems and vulnerable child socio-emotional adjustment (5.2%, n = 99). Compared to developmentally enabled children, the risk of low language at 7-years was greater for children in the three other groups.

CONCLUSION

The cumulative and cluster risk analyses demonstrate the potential to use developmental surveillance to identify children within the first years of life who are at risk of language difficulties. Importantly, parent-child interaction and the home learning environment emerged as a consistent cluster. We recommend they be adopted as the common focus for early intervention and universal language promotion programs.

The effects of maternal input on language in the absence of genetic confounds: Vocabulary development in internationally adopted children

Previous studies have found correlations between parent input and child language outcomes, providing prima facie evidence for a causal relation. However, this could also reflect the effects of shared genes. The present study removed this genetic confound by measuring English vocabulary growth in 29 preschool-aged children (21 girls) aged 31-73 months and 17 infants (all girls) aged 15-32 months adopted from China and Eastern Europe and comparing it to speech produced by their adoptive mothers. Vocabulary growth in both groups was correlated with maternal input features; in infants with mean-length of maternal utterance, and in preschoolers with both mean-length of utterance and lexical diversity. Thus, input effects on language outcomes persist even in the absence of genetic confounds.

A mediation meta-analysis of the role of maternal responsivity in the association between socioeconomic risk and children's language

This meta-analysis tested maternal responsivity as a mediator of the association between socioeconomic risk and children's preschool language abilities. The search included studies up to 2017 and meta-analytic structural equation modeling, allowed us to examine the magnitude of the indirect effect across 17 studies (k = 19). The meta-analysis included 6433 predominantly White, English speaking children (M_age  = 36 months; 50% female) from Western, industrialized countries. All paths in the model were statistically significant, notably, the indirect effect was significant (b = -.052), showing that maternal responsivity may be a proximal intervening variable between socioeconomic risk and children's language development. Moderator analyses found that the indirect effect was stronger for sensitive parenting than warmth and when parenting was assessed in the family home.

Parents' linguistic strategies in interaction with their children with history of cleft lip and/or palate

BACKGROUND

Cleft lip and/or palate (CL/P) presents a rather complex challenge that requires understanding beyond biological or clinical perspective. Even though inaccuracies in speech articulation are the common consequences of CL/P, individuals with repaired CL/P are likely to experience other language-associated issues. Studies on social interaction have generally reported the children to be passive interlocutors, despite having their surgical treatment at the early stages of life.

AIMS

This study aims to describe the linguistic strategies that parents employ when interacting with their repaired CL/P child. How parents allocate the next turn of speaking to their repaired CL/P child will be specifically examined.

METHODS & PROCEDURES

Three parent-child pairs with each child having repaired CL/P were selected to participate in the study. Guided by the principles of Conversation Analysis, their everyday interactions in their homes were video-recorded and transcribed according to the Jefferson System of Transcription Notation (2004). The transcriptions were subsequently analysed in order to highlight the linguistic strategies.

OUTCOMES & RESULTS

Three main linguistic strategies are identified in the parents' turns when they allocate the next turn of speaking to their repaired CL/P child. Specifically, parents' turns are constructed through interrogative sentences in addition to using emphasis words and repeated elicitation of responses from their child.

CONCLUSION & IMPLICATIONS

Parents' linguistic strategies are found to be restrictive as they limit children's active participation. Consequently, the interaction becomes asynchronous rather than synchronous, which could otherwise benefit children's language development. Findings provide information on how parents can be supported in order to foster a positive growth of the children's language development through everyday interactions.

WHAT THIS PAPER ADDS

What is already known on the subject Even after repair surgery, children with CL/P may experience poor language performance that is not limited to inaccuracies in speech articulation. Studies within the area of pragmatics have consistently shown the CL/P children to be passive interlocutors. What this paper adds to existing knowledge This study describes the linguistic strategies employed by parents when they allocate the next turn of speaking to their repaired CL/P child. Parents are found to employ three main strategies: framing the turn into an interrogative sentence, deploying emphasis words and repeatedly eliciting responses. The findings suggest that such strategies limit the interactions, making them asynchronous and potentially unconducive to the positive growth of the child's language development. What are the potential or actual clinical implications of this work? In addition to providing speech treatment to children affected with CL/P, parents, especially those belonging to collectivist groups that are sympathetic to authoritarian parenting styles, can also be informed or trained on other ways to communicate with such individuals.

The Impact of Family Environment on Language Development of Children With Cochlear Implants: A Systematic Review and Meta-Analysis

OBJECTIVES

The authors conducted a systematic review of the literature and meta-analyses to assess the influence of family environment on language development in children with cochlear implants.

DESIGN

The Pubmed, excerpta medica dataBASE (EMBASE), Education Research Information Center, cumulative index to nursing and allied health literature (CINAHL), Healthcare Literature Information Network, PubPsych, and Social SciSearch databases were searched. The search strategy included terms describing family environment, child characteristics, and language development. Studies were included that (a) assessed distal family variables (such as parental income level, parental education, family size, and parental stress) with child language outcomes, and/or more proximal correlates that directly affect the child (such as family engagement and participation in intervention, parenting style, and more specifically, the quantity and quality of parental linguistic input) on child language; (b) included children implanted before the age of 5 years; (c) measured child language before the age of 21 years with standardized instruments; (d) were published between 1995 and February 2018; and (e) were published as peer-reviewed articles. The methodological quality was assessed with an adaptation of a previously validated checklist. Meta-analyses were conducted assuming a random-effects model.

RESULTS

A total of 22 study populations reported in 27 publications were included. Methodological quality was highly variable. Ten studies had a longitudinal design. Three meta-analyses on the correlations between family variables and child language development could be performed. A strong effect of the quality and quantity of parental linguistic input in the first 4½ years postimplantation on the child's language was found, r = 0.564, p ≤ 0.001, 95% confidence interval (CI) = 0.449 to 0.660, accounting for 31.7% of the variance in child language outcomes. Results demonstrated high homogeneity, Q(3) = 1.823, p = 0.61, I = 0. Higher-level facilitative language techniques, such as parental expansions of the child's utterances or the use of open-ended questions, predicted child language skills. Risk of publication bias was not detected. The results on the impact of family involvement/participation in intervention on child language development were more heterogeneous. The meta-analysis included mainly cross-sectional studies and identified low to moderate benefits, r = 0.380, p ≤ 0.052, 95% CI = -0.004 to 0.667, that almost attained significance level. Socioeconomic status, mainly operationalized by parental level of education, showed a positive correlation with child language development in most studies. The meta-analysis confirmed an overall low and nonsignificant average correlation coefficient, r = 0.117, p = 0.262, 95% CI = -0.087 to 0.312. A limitation of the study was the lack of some potentially relevant variables, such as multilingualism or family screen time.

CONCLUSIONS

These data support the hypothesis that parental linguistic input during the first years after cochlear implantation strongly predicts later child language outcomes. Effects of parental involvement in intervention and parental education are comparatively weaker and more heterogeneous. These findings underscore the need for early-intervention programs for children with cochlear implants focusing on providing support to parents for them to increase their children's exposure to high-quality conversation.

Preterm birth and risk for language delays before school entry: A sibling-control study

We investigated whether children born preterm are at risk for language delay using a sibling-control design in the Norwegian Mother and Child Cohort Study (MoBa), conducted by the Norwegian Institute of Public Health. Participants included 26,769 siblings born between gestational weeks 23 and 42. Language delay was assessed when the children were 1.5, 3, and 5 years old. To adjust for familial risk factors, comparisons were conducted between preterm and full-term siblings. Pregnancy-specific risk factors were controlled for by means of observed variables. Findings showed that preterm children born before week 37 had increased risk for language delays at 1.5 years. At 3 and 5 years, only children born before week 34 had increased risk for language delay. Children born weeks 29–33 and before week 29 had increased risk for language delay at 1.5 years (RR = 4.51, 95% CI [3.45, 5.88]; RR = 10.32, 95% CI [6.7, 15.80]), 3 years (RR = 1.50, 95% CI [1.02, 2.21]; RR = 2.78, 95% CI [1.09, 7.07]), and 5 years (RR = 1.63, 95% CI [1.06, 2.51]; RR = 2.98, 95% CI [0.87, 10.26]), respectively. In conclusion, children born preterm are at risk for language delays, with familial confounders only explaining a moderate share of the association. This suggests a cause-effect relationship between early preterm birth and risk for language delay in preschool children.

Measurement of child-directed speech: A survey of clinical practice

Purpose: Clear correlations exist between the quality and quantity of child-directed speech (CDS) and children's language development. Interventions for children with poor language skills involve manipulation of the quality and/or quantity of CDS in a child's daily experience. Assessment of CDS is therefore important. There are a range of CDS measures reported in the literature, however no data exist on the use of these in clinical practice. The aim of this study was to identify current clinical practices in measurement of CDS.Method: An online survey was developed using the Qualtrics platform. Brief study information and a link to the survey were distributed to speech-language pathologists working in New Zealand and Australia.Result: Responses from 116 clinicians were analysed. Participants mainly reported using informal analysis of adult-child observations, checklists and informal discussion with adults to measure CDS. The barriers to measuring CDS reported were time, teaming with adults and psychometric properties of informal methods.Conclusion: There are few psychometrically validated clinical tools which are "fit for purpose" to measure qualitative aspects of CDS. Automated speech analysis technology appears to have potential as a quantitative measure of CDS to support clinical practice.

Which measure of socioeconomic status best predicts bilingual lexical abilities and how? A focus on four-year-olds exposed to two majority languages

This study evaluates the ability of different measures of socioeconomic status (SES) to predict lexical outcomes for preschoolers raised in a context of nationwide bilingualism. The participants were 58 children aged 3;11-4;3 from Maltese-dominant homes who attended state preschools. Receptive picture name judgement and picture naming, in Maltese and English, were employed to measure receptive and expressive lexical abilities, respectively. Lexical outcomes for four individual SES variables and a single composite SES measure were similar but not directly interchangeable. The composite SES variable emerged as most strongly predictive of children's lexical performance. Receptive judgement of phonological accuracy improved similarly in both languages with higher composite SES. Naming skills increased significantly in English but not in Maltese, suggesting differences in English input related to parental SES. A focus on SES in relation to lexical skills in two majority languages is novel and adds to current understanding of normative bilingual acquisition.

Modelling the early expressive communicative trajectories of infants/toddlers with early cochlear implants

For children with normal hearing (NH), early communication skills predict vocabulary, a precursor to grammar. Growth in early communication skills of infants with cochlear implants (CIs) was investigated using the Early Communication Indicator (ECI), a play-based observation measure. Multilevel linear growth modelling on data from six ECI sessions held at three-monthly intervals revealed significant growth overall, with a non-significant slower growth rate than that of children with NH (comparison age centred at 18 months). Analyses of gesture use and of nonword vocalisations revealed the CI group used significantly more of each, with more rapid growth. In contrast, the CI group used significantly fewer single words and multiword utterances, and with slower growth. Maternal education and time to achieve consistent CI use impacted significantly on growth for the CI sample. The results indicate that progression to vocabulary by young CI users can be supported by encouraging their use of prelinguistic communication.

Infant language predicts fathers' vocabulary in infant-directed speech

Research on sources of individual difference in parental Infant-Directed Speech (IDS) is limited and there is a particular lack of research on fathers' compared to mothers' speech. This study examined the predictive relations between infant characteristics and variability in paternal lexical diversity (LD) in dyadic free play with two-year-olds (M = 24.1 months, SD = 1.39, 35 girls). Ten minutes of interaction for sixty-four father-infant dyads were transcribed and multiple regression analyses were performed to examine the effects of a set of distal and proximal sources of infant influence on paternal LD. Fathers' LD was predicted only by infant language, both standardised language scores and dynamic language measures, and was not predicted by infant age, gender, executive function, or temperament. Findings are discussed in the light of the complex interplay of factors contributing to variability in IDS and the infant's linguistic environment.

How Young Children Learn Language and Speech

Pediatric clinicians are on the front line for prevention of language and speech disorders. This review uses prevailing theories and recent data to justify strategies for prevention, screening and detection, diagnosis, and treatment of language and speech disorders. Primary prevention rests on theories that language learning is an interaction between the child's learning capacities and the language environment. Language learning occurs in a social context with active child engagement. Theories support parent education and public programs that increase children's exposure to child-directed speech. Early detection of delays requires knowledge of language milestones and recognition of high-risk indicators for disorders. Male sex, bilingual environments, birth order, and chronic otitis media are not adequate explanations for significant delays in language or speech. Current guidelines recommend both general and autism-specific screening. Environmental and genetic factors contribute to primary language and speech disorders. Secondary and tertiary prevention requires early identification of children with language and speech disorders. Disorders may be found in association with chromosomal, genetic, neurologic, and other health conditions. Systematic reviews find that speech-language therapy, alone or in conjunction with other developmental services, is effective for many disorders. Speech-language interventions alter the environment and stimulate children's targeted responding to improve their skills.

Hearing me hearing you: Reciprocal effects between child and parent language in autism and typical development

Language development in typically developing children (TD) has traditionally been investigated in relation to environmental factors, while language in children with autism spectrum disorder (ASD) has primarily been related to child-based factors. We employ a longitudinal corpus of 32 preschoolers with ASD and 35 linguistically matched TD peers recorded over 6 visits (ranging between 2 and 5 years of age) to investigate the relative importance of child-based and environmental factors in language development for both populations. We also investigate the reciprocal interaction between children's response to parents' input, and parents' response to children's production. We report six major findings. (1) Children's production of word types, tokens, and MLU increased across visits, and were predicted by their Expressive Language (EL) (positively) and diagnosis (negatively) from Visit 1. (2) Parents' production also increased across visits, and was predicted by their child's nonverbal cognition (positively) and diagnosis (negatively) from Visit 1. (3) At all visits and across groups, children and parents matched each other in lexical and syntactic production; (4) Parents who produced longer MLUs during a given visit had children who produced more word types and tokens, and had longer MLUs, at the subsequent visit. (5) When both child EL at Visit 1 and parent MLU were included in the model, both contributed significantly to future child language; however, EL accounted for a greater proportion of the variance. (6) Finally, children's speech significantly predicted parent speech at the next visit. Taken together, these results draw more attention to the importance of child-based factors in the early language development of TD children, and to the importance of parental language factors in the early language development of children with ASD.

Dimensions of deprivation and threat, psychopathology, and potential mediators: A multi-year longitudinal analysis

Prior research demonstrates a link between exposure to childhood adversity and psychopathology later in development. However, work on mechanisms linking adversity to psychopathology fails to account for specificity in these pathways across different types of adversity. Here, we test a conceptual model that distinguishes deprivation and threat as distinct forms of childhood adversity with different pathways to psychopathology. Deprivation involves an absence of inputs from the environment, such as cognitive and social stimulation, that influence psychopathology by altering cognitive development, such as verbal abilities. Threat includes experiences involving harm or threat of harm that increase risk for psychopathology through disruptions in social-emotional processing. We test the prediction that deprivation, but not threat, increases risk for psychopathology through altered verbal abilities. Data were drawn from the Child Development Project (N = 585), which followed children for over a decade. We analyze data from assessment points at age 5, 6, 14, and 17 years. Mothers completed interviews at age 5 and 6 on exposure to threat and deprivation experiences. Youth verbal abilities were assessed at age 14. At age 17, mothers reported on child psychopathology. A path analysis model tested longitudinal paths to internalizing and externalizing problems from experiences of deprivation and threat. Consistent with predictions, deprivation was associated with risk for externalizing problems via effects on verbal abilities at age 14. Threat was associated longitudinally with both internalizing and externalizing problems, but these effects were not mediated by verbal abilities. Results suggest that unique developmental mechanisms link different forms of adversity with psychopathology. (PsycINFO Database Record

Self-reported parental vocabulary input frequency for young children

Vocabulary input frequency influences age of acquisition, and is also an essential control for investigating the influence of other factors. We propose a new method of frequency estimation, self-report. 918 Danish-speaking parents of 12-36-month-old children estimated their frequency of use of 725 words. Self-report was substantially correlated with both language sample based frequencies (0.67) and frequencies of a large written corpus of Danish (0.58). Correlations within vocabulary categories between frequency and age of acquisition, restricted to words occurring in the language samples, were comparable for the two estimates. Overall, self-report based frequency estimates appear to have a promising degree of validity, which reflects their greatest strength, independence of the situation.

Integración auditiva, visual y propioceptiva como sustrato del desarrollo del lenguaje

Introducción. El desarrollo del lenguaje es un proceso complejo considerado como marcador evolutivo del ser humano y puede ser comprendido a partir de la contribución de los sistemas sensoriales y de los eventos que ocurren en periodos críticos del desarrollo.Objetivo. Realizar una revisión de cómo se da la integración de la información auditiva, visual y propioceptiva y cómo se refleja en el desarrollo del lenguaje, destacando el papel de la interacción social como contexto que favorece este proceso.Materiales y métodos. Se utilizaron los términos MeSH “Language Development”; “Visual Perception”; “Hearing”; y “Proprioception en las bases de datos MEDLINE y Embase, limitando la búsqueda principal a artículos escritos en inglés, español y portugués.Resultados. El punto de partida lo constituye la información auditiva, la cual, en el primer año de vida, permite la discriminación de los elementos del ambiente que corresponden al lenguaje; luego un pico en su adquisición y posteriormente una etapa de máxima discriminación lingüística. La información visual proporciona la correspondencia del lenguaje en imágenes, sustrato de nominación y comprensión de palabras, además de la interpretación e imitación del componente emocional en la gesticulación. La información propioceptiva ofrece la retroalimentación de los patrones de ejecución motora empleados en la producción del lenguaje.Conclusión. El estudio del desarrollo lenguaje desde la integración sensorial ofrece nuevas perspectivas para el abordaje e intervención de sus desviaciones.

Prenatal and perinatal risks for late language emergence in a population-level sample of twins at age 2

BACKGROUND

Late Language Emergence (LLE) in the first two years of life is one of the most common parental concerns about child development and reasons for seeking advice from health professionals. LLE is much more prevalent in twins (38%) than singletons (20%). In studies of language development in twins without overt disability, adverse prenatal and perinatal environments have been reported to play a lesser role in the etiology of LLE than adverse postnatal environments. However, there is a lack of population-level evidence about prenatal and perinatal risk factors for LLE in twins. This study investigated the extent to which prenatal and perinatal risk factors were associated with LLE in a population-level sample of twins at age 2 without overt disability.

METHODS

The sample comprised 473 twin pairs drawn from a population sample frame comprising statutory notifications of all births in Western Australia (WA), 2000-2003. Twin pairs in which either twin had a known developmental disorder or exposure to language(s) other than English were excluded. Of the 946 twins, 47.9% were male. There were 313 dizygotic and 160 monozygotic twin pairs. LLE was defined as a score at or below the gender-specific 10th percentile on the MacArthur Communicative Development Inventories: Words and Sentences (CDI-WS) (Words Produced). Bivariate and multivariable logistic regression was used to investigate risk factors associated with LLE.

RESULTS

In the multivariable model, risk factors for LLE in order of decreasing magnitude were: Gestational diabetes had an adjusted odds ratio (aOR) of 19.5 (95% confidence interval (CI) 1.2, 313.1); prolonged TSR (aOR: 13.6 [2.0, 91.1]); multiparity (aOR: 7.6 [1.6, 37.5]), monozygosity (aOR: 6.9 [1.7, 27.9]) and fetal growth restriction (aOR: 4.6 [1.7, 12.7]). Sociodemographic risk factors (e.g., low maternal education, socioeconomic area disadvantage) were not associated with increased odds of LLE.

CONCLUSIONS

The results suggest that adverse prenatal and perinatal environments are important in the etiology of LLE in twins at age 2. It is important that health professionals discuss twin pregnancy and birth risks for delayed speech and language milestones with parents and provide ongoing developmental monitoring for all twins, not just twins with overt disability.

Let's Talk: Parents' Mental Talk (Not Mind-Mindedness or Mindreading Capacity) Predicts Children's False Belief Understanding

Although one might expect parents' mind-mindedness (MM; the propensity to view children as mental agents) to relate to everyday mental-state talk (MST) and theory-of-mind capacity, evidence to support this view is lacking. In addition, both the uniqueness and the specificity of relations between parental MM, parental MST, and children's false belief understanding (FBU) are open to question. To address these three gaps, this study tracked 117 preschoolers (60 boys) and their parents across a 13-month period (M_age  = 3.94 years, SD = 0.53, at Time 1). Parental MM, MST, and theory-of-mind capacity showed little overlap. Both MM and MST were weakly associated with children's concurrent FBU, but in line with social constructivist accounts, only MST predicted later FBU.

The Changing View of Input in the Treatment of Children With Grammatical Deficits

PURPOSE

The purpose of this article is to present 3 approaches that emphasize the role that input plays in the treatment of grammatical deficits in children with language impairments.

METHOD

These approaches-input informativeness, competing sources of input, and high variability-were selected because they go beyond issues of token frequency and emphasize instead type frequency, relative frequency, and frequency at an abstract as well as a concrete level of grammar. Each of these approaches can be applied to the grammatical deficits seen in children with specific language impairment and can be readily used with well-established procedures, such as focused stimulation and recasting.

RESULTS

Each approach is supported by a body of laboratory research with children with typical language skills, and the feasibility of each has been tested in studies with a treatment design. Furthermore, the assumptions of the 3 approaches are largely compatible, permitting application of combinations of these approaches without violating any of their principles.

CONCLUSION

The positive findings from each of these approaches should serve as a basis for further clinical research.

Late Talkers: A Population-Based Study of Risk Factors and School Readiness Consequences

PURPOSE

This study was designed to (a) identify sociodemographic, pregnancy and birth, family health, and parenting and child care risk factors for being a late talker at 24 months of age; (b) determine whether late talkers continue to have low vocabulary at 48 months; and (c) investigate whether being a late talker plays a unique role in children's school readiness at 60 months.

METHOD

We analyzed data from the Early Childhood Longitudinal Study, a population-based sample of 9,600 children. Data were gathered when the children were 9, 24, 48, and 60 months old.

RESULTS

The risk of being a late talker at 24 months was significantly associated with being a boy, lower socioeconomic status, being a nonsingleton, older maternal age at birth, moderately low birth weight, lower quality parenting, receipt of day care for less than 10 hr/week, and attention problems. Being a late talker increased children's risk of having low vocabulary at 48 months and low school readiness at 60 months. Family socioeconomic status had the largest and most profound effect on children's school readiness.

CONCLUSIONS

Limited vocabulary knowledge at 24 and 48 months is uniquely predictive of later school readiness. Young children with low vocabularies require additional supports prior to school entry.

Executive Function Mediates the Relations between Parental Behaviors and Children's Early Academic Ability

The past decade has witnessed a growth of interest in parental influences on individual differences in children's executive function (EF) on the one hand and in the academic consequences of variation in children's EF on the other hand. The primary aim of this longitudinal study was to examine whether children's EF mediated the relation between three distinct aspects of parental behavior (i.e., parental scaffolding, negative parent-child interactions, and the provision of informal learning opportunities) and children's academic ability (as measured by standard tests of literacy and numeracy skills). Data were collected from 117 parent-child dyads (60 boys) at two time points ~1 year apart (M Age at Time 1 = 3.94 years, SD = 0.53; M Age at Time 2 = 5.11 years, SD = 0.54). At both time points children completed a battery of tasks designed to measure general cognitive ability (e.g., non-verbal reasoning) and EF (e.g., inhibition, cognitive flexibility, working memory). Our models revealed that children's EF (but not general cognitive ability) mediated the relations between parental scaffolding and negative parent-child interactions and children's early academic ability. In contrast, parental provision of opportunities for learning in the home environment was directly related to children's academic abilities. These results suggest that parental scaffolding and negative parent-child interactions influence children's academic ability by shaping children's emerging EF.

Causal effects on child language development: A review of studies in communication sciences and disorders

We reviewed recent studies published across key journals within the field of communication sciences and disorders (CSD) to survey what causal influences on child language development were being considered. Specifically, we reviewed a total of 2921 abstracts published within the following journals between 2003 and 2013: Language, Speech, and Hearing Services in Schools (LSHSS); American Journal of Speech-Language Pathology (AJSLP); Journal of Speech, Language, and Hearing Research (JSLHR); Journal of Communication Disorders (JCD); and the International Journal of Language and Communication Disorders (IJLCD). Of the 346 eligible articles that addressed causal factors on child language development across the five journals, 11% were categorized as Genetic (37/346), 83% (287/346) were categorized as Environmental, and 6% (22/346) were categorized as Mixed. The bulk of studies addressing environmental influences focused on therapist intervention (154/296=52%), family/caregiver linguistic input (65/296=22%), or family/caregiver qualities (39/296=13%). A more in-depth review of all eligible studies published in 2013 (n=34) revealed that family/caregiver qualities served as the most commonly controlled environmental factor (e.g., SES) and only 3 studies explicitly noted the possibility of gene-environment interplay. This review highlighted the need to expand the research base for the field of CSD to include a broader range of environmental influences on child language development (e.g., diet, toxin exposure, stress) and to consider more directly the complex and dynamic interplay between genetic and environmental effects.

LEARNING OUTCOMES

Readers will be able to highlight causal factors on child language development that have been studied over the past decade in CSD and recognize additional influences worthy of consideration. In addition, readers will become familiar with basic tenets of developmental systems theory, including the complex interplay between genetic and environmental factors that shapes child development.