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Genome-Wide Analyses of Vocabulary Size in Infancy and Toddlerhood: Associations With Attention-Deficit/Hyperactivity Disorder, Literacy, and Cognition-Related Traits

The number of words children produce (expressive vocabulary) and understand (receptive vocabulary) changes rapidly during early development, partially due to genetic factors. Here, we performed a meta-genome-wide association study of vocabulary acquisition and investigated polygenic overlap with literacy, cognition, developmental phenotypes, and neurodevelopmental conditions, including attention-deficit/hyperactivity disorder. 

Impact of ventilation tube insertion on long-term language outcomes at 6 and 10 years of age: A prospective pregnancy cohort study

Investigating the impact of early childhood ventilation tube insertion (VTI) on long-term language outcomes. 

Arcuate fasciculus and pre-reading language development in children with prenatal alcohol exposure

Prenatal alcohol exposure (PAE) contributes to widespread neurodevelopmental challenges, including reading, and has been associated with altered white matter. Here, we aimed to investigate whether arcuate fasciculus development is associated with pre-reading language skills in young children with PAE.

Language and reading impairments are associated with increased prevalence of non-right-handedness

Handedness has been studied for association with language-related disorders because of its link with language hemispheric dominance. No clear pattern has emerged, possibly because of small samples, publication bias, and heterogeneous criteria across studies.

Caregiver sensitivity predicts infant language use, and infant language complexity predicts caregiver language complexity, in the context of possible emerging autism

While theory supports bidirectional effects between caregiver sensitivity and language use, and infant language acquisition-both caregiver-to-infant and also infant-to-caregiver effects-empirical research has chiefly explored the former unidirectional path. In the context of infants showing early signs of autism, we investigated prospective bidirectional associations with 6-min free-play interaction samples collected for 103 caregivers and their infants (mean age 12-months; and followed up 6-months later).

The oral and written narrative language skills of adolescent students in youth detention and the impact of language disorder

Unmet language and literacy needs are common among young people who are involved with youth justice systems. However, there is limited research regarding the functional text-level language skills of this population with regard to narrative macrostructure (story grammar) and microstructure (semantics and syntax) elements. In this study, we examined macrostructure and microstructure elements in the oral and written narrative texts of 24 adolescent students of a youth detention centre. The students, who were aged 14- to 17- years, were all speakers of Standard Australian English, and 11 (46%) students met criteria for language disorder (LD).

Associations between clusters of early life risk factors and developmental vulnerability at age 5

This study investigated the associations between clusters of early life risk factors and developmental vulnerability in children's first year of full-time school at age 5

How many words are Australian children hearing in the first year of life?

These results show that a word gap related to maternal education is not apparent up to twelve months of age

Longitudinal study of language and speech of twins at 4 and 6 years: Twinning effects decrease, zygosity effects disappear, and heritability increases

This study investigates the heritability of language, speech, and nonverbal cognitive development of twins at 4 and 6 years of age.

Landmark language study draws to a close - but the work is just beginning

A joint initiative between The Kids Research Institute Australia, The University of Western Australia, the University of Kansas and Nebraska University, it is the world’s only study to conduct such a detailed assessment of language and literacy development from infancy through the formative adolescent years.