Does Vocabulary Grow in Nature? Exploring the Impacts of Nature-Based Early Learning on Young Children's Receptive Vocabulary Development

Purpose: There is a lack of longitudinal data on predictors of vocabulary development in children with Down syndrome (DS). In typically developing children, many internal and external predictors of vocabulary development have been determined before. The purpose of the present study was to investigate the role of these variables in the receptive and expressive vocabulary development of children with DS.Method: The present study used a longitudinal design in young children with DS to study the vocabulary development over a period of 1.6 years and investigated the possible predictive role of child-related and environmental variables.Result: Receptive vocabulary development was best predicted by the adaptive level of functioning and early receptive vocabulary skills. Expressive vocabulary development was best predicted by the adaptive level of functioning, receptive vocabulary, maternal educational level, level of communicative intent of the child, attention skills and phonological/phonemic awareness.Conclusion: A wide range of internal and external predictors for vocabulary development of children with DS was found. Predictors resemble those predicting vocabulary development in peers with typical development between 1 and 6 years of age, as identified in other studies.

Receptive vocabulary develops rapidly in early childhood and builds the foundation for language acquisition and literacy. Variation in receptive vocabulary ability is associated with variation in children's school achievement, and low receptive vocabulary ability is a risk factor for under-achievement at school. In this study, bivariate and multivariate growth curve modelling was used to estimate trajectories of receptive vocabulary development in relation to a wide range of candidate child, maternal and family level influences on receptive vocabulary development from 4–8 years. The study sample comprised 4332 children from the first nationally representative Longitudinal Study of Australian Children (LSAC). Predictors were modeled as risk variables with the lowest level of risk as the reference category. In the multivariate model, risks for receptive vocabulary delay at 4 years, in order of magnitude, were: Maternal Non- English Speaking Background (NESB), low school readiness, child not read to at home, four or more siblings, low family income, low birthweight, low maternal education, maternal mental health distress, low maternal parenting consistency, and high child temperament reactivity. None of these risks were associated with a lower rate of growth from 4–8 years. Instead, maternal NESB, low school readiness and maternal mental health distress were associated with a higher rate of growth, although not sufficient to close the receptive vocabulary gap for children with and without these risks at 8 years. Socio-economic area disadvantage, was not a risk for low receptive vocabulary ability at 4 years but was the only risk associated with a lower rate of growth in receptive vocabulary ability. At 8 years, the gap between children with and without socio-economic area disadvantage was equivalent to eight months of receptive vocabulary growth. These results are consistent with other studies that have shown that social gradients in children's developmental outcomes increase over time.

Objective: To investigate the development of receptive and expressive vocabulary in Mandarin-speaking children with cochlear implants (CI) during the first year after CI activation. Methods: A total of 827 children (411 boys and 416 girls) who were implanted CI before 2.5 years of age from October 2019 to December 2022 in the Department of Auditory Implantation, Shandong Provincial ENT Hospital were included in this study. The Infant Checklist of the Mandarin Early Vocabulary Inventory (EVI) was used to assess the quantity and content of receptive and expressive vocabulary at the time of CI activation and at the 1st, 3rd, 6th, 9th, 12th months post-activation. SPSS 22.0 was used to describe the receptive and expressive vocabulary of CI children at the first year after activation. Results: During the first year after CI activation, CI children's receptive and expressive vocabulary consistently increased with the CI usage. The average number of receptive vocabulary and expressive vocabulary respectively increased from 0 to 178, and from 0 to 97. At the first year of post-activation, the number of receptive and expressive vocabulary of CI children were superior to that of hearing-age matched typical-hearing children, but fell behind of that of chronological age matched typical-hearing children. In terms of lexical categories, receptive and expressive vocabulary was acquired in the following order: nouns, verbs, adjectives, and pronouns. Among the top 50 words that CI children could express, nouns were the most common, then followed by verbs, adjectives, and pronouns. Father's education level can significantly and positively predictethe receptive vocabulary of CI children at the first year post-activation. At the first year after CI activation, the 10th, 25th, 50th, 75th, and 90th percentiles were 113, 149, 178, 202, 223 for the receptive vocabulary, and 9, 37, 97, 148, 188 for expressive vocabulary. Conclusion: For Mandarin speaking children with CI, the receptive and expression vocabulary continuely increased within the first year after CI activation. The ability to grasp receptive vocabulary precedes the ability to express expressive vocabulary. Compared to hearing-age matched typical-hearing children, CI children showed faster rate of the vocabulary growth, and earlier and more frequently verb expression. However, it still larged behind that of chronological age matched hearing normal children. CI children respectively understood and expressed nouns and verbs the first. In children with CI, the first concepts understood and expressed were nouns and verbs. Among the first 50 words expressed, nouns were the most numerous, and the age at which verbs were acquired was earlier than that for hearing-age matched typical-hearing children.

Family socioeconomic status (SES) has been frequently linked to children's early development. Treating SES as an aggregated variable has many issues, as different components of SES may relate to child outcomes through divergent mechanisms. The purpose of the study was to examine whether parents' engagement in home learning activities and children's participation in extracurricular activities (EAs) would function as pathways through which individual SES components related to children's school readiness. A total of 588 families with preschool-aged children were recruited from Guangdong province in China. Children's receptive vocabulary, Chinese reading, and early math skills were individually assessed at three time points, and children's social skills were rated by parents. Parents reported their engagement in home learning activities with children and their children's participation in EAs. The results showed that all three components of family SES were related to multiple aspects of children's school readiness, but through different pathways. Parental income was related to children's school readiness through EA participation only; parental education and occupational status were associated with school readiness via both parental engagement and child EA participation. The findings suggest that considering SES components separately will produce a more nuanced understanding of the divergent pathways through which family SES may relate to children's school readiness. Chinese government may provide parent education programs focused on cognitive stimulation for low-SES families to promote children's school readiness. Furthermore, the government needs to ensure children's equal access to EAs to prevent increasing the developmental gap among children from discrepant socioeconomic backgrounds.

Socioeconomic status and receptive vocabulary development: Replication of the parental investment model with Chilean preschoolers and their families

Objectives: The purpose of this study was to examine the role of speech sound disorders in the development of children’s vocabulary through longitudinal analysis. Methods: Three hundred and twenty-four 6-year-old children were assessed in severity groups with speech sound disorders (SSD: general level, a slight error, the recommendation for in-depth examination, and suspected speech sound disorder). This study examined whether the model of change in vocabulary (receptive, expressive) original score according to age (3, 5, and 7 years old) of four SSD groups was suitable for the Latent Growth Model. In addition, cross-analysis was used to examine whether there was a significant difference in the classification of receptive and expressive vocabulary development normality (abnormal, normal development, slight delay, and vocabulary development delay) according to age changes in the four groups. Results: Results found that the severity of SSD did not affect vocabulary development continuity, but had a significant effect on the classification of vocabulary development normality standards. The severity of SSD had a significant effect on the development delay of the 7-year-old receptive vocabulary and the development delay of the 3-year-old expressive vocabulary. Conclusion: It would be desirable to check the vocabulary development of children with SSD according to age, understanding that subjects with suspected SSD can show significant differences in expressive vocabulary at the age of 3 and receptive vocabulary development at the age of 7.

Receptive vocabulary development is a component of the human language system that emerges in the first year of life and is characterised by onward expansion throughout life. Beginning in infancy, children's receptive vocabulary knowledge builds the foundation for oral language and reading skills. The foundations for success at school are built early, hence the public health policy focus on reducing developmental inequalities before children start formal school. The underlying assumption is that children's development is stable, and therefore predictable, over time. This study investigated this assumption in relation to children's receptive vocabulary ability. We investigated the extent to which low receptive vocabulary ability at 4 years was associated with low receptive vocabulary ability at 8 years, and the predictive utility of a multivariate model that included child, maternal and family risk factors measured at 4 years. The study sample comprised 3,847 children from the first nationally representative Longitudinal Study of Australian Children (LSAC). Multivariate logistic regression was used to investigate risks for low receptive vocabulary ability from 4–8 years and sensitivity-specificity analysis was used to examine the predictive utility of the multivariate model. In the multivariate model, substantial risk factors for receptive vocabulary delay from 4–8 years, in order of descending magnitude, were low receptive vocabulary ability at 4 years, low maternal education, and low school readiness. Moderate risk factors, in order of descending magnitude, were low maternal parenting consistency, socio-economic area disadvantage, low temperamental persistence, and NESB status. The following risk factors were not significant: One or more siblings, low family income, not reading to the child, high maternal work hours, and Aboriginal or Torres Strait Islander ethnicity. The results of the sensitivity-specificity analysis showed that a well-fitted multivariate model featuring risks of substantive magnitude does not do particularly well in predicting low receptive vocabulary ability from 4–8 years.

In late infancy and early toddlerhood, joint attention ability is widely recognized as a crucial foundation for children's vocabulary development, though the exact nature of its contribution remains debated. This study investigates associations between joint attention and subsequent vocabulary development, as well as the possible moderating role of supportive parental behaviors. Seventy children and their families participated in this longitudinal study, which began when the children were 10months of age. Parents completed the Swedish Communicative Development Inventory (CDI) at four age points (10, 12, 18, and 24months) to assess receptive and expressive vocabulary growth. Children participated in lab-based assessment of joint attention abilities at 10, 12, and 18months. Additionally, at 10 and 12months, parent-child dyads participated in two semi-structured lab assessments to evaluate the quality of parental supportive behaviors during interactions with their child. Primary analysis showed no significant effects of joint attention on subsequent receptive and expressive vocabulary. However, a significant interaction was found between a child's ability to respond to joint attention cues and parental supportive behaviors on receptive vocabulary. These findings indicate that parental supportive behaviors play a crucial role in promoting the development of children's receptive vocabulary.

Development of receptive vocabulary and verbal intelligence in Japanese children with unilateral hearing loss

The receptive (aural) vocabulary development of children with binaural-aided residual hearing was investigated in a prospective longitudinal analysis (repeated measures). Thirty-three children with sensorineural hearing loss, without major co-morbidities (mean age at the first testing point, 56.2 months, standard deviation 19.0 months) were recruited from the 1994 German Goettinger Hearing Language Register. Their receptive vocabulary was measured using standardised tests (with reference to normal hearing child performance) on three separate test points (mean follow up, 18.7 months, standard deviation 5.0 months). On average, the study group scored below the normal range at the first and second tests and made a significant improvement at the last test. The degree of hearing loss was found to be significantly correlated to vocabulary performance at all time points, with increasing correlation coefficients. At the third test, significant predictive variables for successful receptive vocabulary outcome were found to be: degree of hearing loss (t = 5.43; p < 0.0001); age at diagnosis (t = 2.29; p = 0.03); and nonverbal intelligence (t = 2.82; p = 0.009). If permanent childhood hearing impairment is mild and/or is detected early, and if the child grows up in a monolingual environment, the development of receptive vocabulary within the normal range is possible.

Idioms play an important role in language; however, little research has examined idioms in children's natural language settings. This study explored idioms usage in maternal talk during mother-child shared book reading and its relation to children's vocabulary development. Thirty-three Chinese children in Norway (aged 3;0-5;5) and their mothers participated. We observed shared reading at the onset of the study and assessed children's receptive and expressive vocabulary in Chinese three times across one year. Results demonstrated that mothers used an average of 1.8 idioms and explained one-third of the idioms. Maternal idiom usage was correlated with their talk amount and lexical diversity. Individual growth modeling revealed that the number of idioms mothers used predicted the growth of children's receptive vocabulary in Chinese. We speculate that idiom usage could be an effective and understudied marker of parental linguistic sophistication. This study underscores the importance of idiom exposure in children's language environment.

Sharing information books with kindergartners: The role of parents’ extra-textual talk and socioeconomic status

This study investigated the influence of cognitive ability on bilingual children's vocabulary development in both their languages. Sixty‐nine bilingual immigrant children participated, with data collected at three annual intervals. At Time 1, the participants were 5 or 6 years old. Receptive vocabulary was tested in the minority (Turkish, Tarifit) and majority (Dutch) languages. Cognitive measures targeted working memory, selective attention, and executive attention. Cross‐lagged correlations were computed to establish the directionality of relationships. Significant partial correlations were followed by stepwise multiple regression analyses in which further control was exerted. Results showed that cognitive ability predicted receptive vocabulary 1 year later. Sequential relationships were found for the majority language only, and attention was more important than working memory. The differential patterns for the two languages set the stage for future research comparing the impact of context, timing, and type of learning on the relationship between cognition and vocabulary development.

Chinese-English dual language learners (Chinese DLLs) are a growing population in the US. Existing studies of preschool-aged Chinese DLLs mostly focused on single-word vocabulary and rarely explored other skills important for school readiness. In the current study, we examined Chinese DLLs’ development of receptive vocabulary and comprehension of semantic concepts (i.e. spatial and quantification expressions) in both English and Chinese (Mandarin/Cantonese) during a preschool year. Results indicated that while semantic concept comprehension in both English and Chinese showed significant growth during the year, only English, but not Chinese, receptive vocabulary showed a significant increase. Furthermore, DLLs’ semantic comprehension, but not receptive vocabulary, showed cross-language transfer. Finally, the richness of DLLs’ language experiences (e.g. frequency of book reading, multimedia exposure) at home was a significant predictor of Chinese DLLs’ receptive vocabulary and semantic concept comprehension in the respective language. Supporting families to provide rich language experiences in both English and the home language may hold key to fostering successful dual language development.

Despite consensus in the developmental literature regarding the role of executive function (EF) skills in supporting the development of language skills during the preschool years, we know relatively little about the associations between EF skills, including all EF components, and vocabulary skills among preschool‐aged children. In this paper, we address this gap by fitting structural equation models to examine the associations between beginning‐of‐preschool EF and end‐of‐preschool receptive vocabulary, as well as the association between beginning‐of‐preschool receptive vocabulary and end‐of‐preschool EF skills, to data from 400 preschool‐aged children. We find that EF skills at the beginning of preschool are a significant predictor of receptive vocabulary skills at the end of preschool, controlling for receptive vocabulary at the beginning of preschool. However, receptive vocabulary skills at the beginning of preschool do not predict EF skills at the end of preschool, controlling for EF at the beginning of preschool. Our findings are suggestive of the important role EF plays in supporting growth in receptive vocabulary skills, above and beyond earlier vocabulary levels, and of the direction of the developmental pathway between EF and receptive vocabulary in the preschool years. The discussion highlights the need for further research in the optimal approach for supporting children's EF skill development in preschool. Copyright © 2013 John Wiley &amp; Sons, Ltd.