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Syntactic and Semantic Specialization and Integration in 5- to 6-Year-Old Children during Auditory Sentence Processing
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Family-based genetic investigation of SLI (Andres et al., 2020) ...
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Family-based genetic investigation of SLI (Andres et al., 2020) ...
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2019 ASHA Research Symposium: Mabel L. Rice, Panel Discussion on Specific Language Impairment ...
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2019 ASHA Research Symposium: Mabel L. Rice, What Studies of Twins Tell Us About Specific Language Impairment in Children: Twinning Effects & Heritability at 2, 4, 6, and 16 Years of Age ...
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2019 ASHA Research Symposium: Mabel L. Rice, Panel Discussion on Specific Language Impairment ...
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2019 ASHA Research Symposium: Mabel L. Rice, Panel Discussion on Specific Language Impairment ...
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2019 ASHA Research Symposium: Mabel L. Rice, What Studies of Twins Tell Us About Specific Language Impairment in Children: Twinning Effects & Heritability at 2, 4, 6, and 16 Years of Age ...
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2019 ASHA Research Symposium: Mabel L. Rice, What Studies of Twins Tell Us About Specific Language Impairment in Children: Twinning Effects & Heritability at 2, 4, 6, and 16 Years of Age ...
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Causal Pathways for Specific Language Impairment: Lessons From Studies of Twins
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In: J Speech Lang Hear Res (2020)
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Pedigree-Based Gene Mapping Supports Previous Loci and Reveals Novel Suggestive Loci in Specific Language Impairment
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In: J Speech Lang Hear Res (2020)
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Advances in Specific Language Impairment Research and Intervention: An Overview of Five Research Symposium Papers
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In: J Speech Lang Hear Res (2020)
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Heritability of Specific Language Impairment and Nonspecific Language Impairment at Ages 4 and 6 Years Across Phenotypes of Speech, Language, and Nonverbal Cognition
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In: J Speech Lang Hear Res (2020)
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Abstract:
PURPOSE: Early language and speech acquisition can be delayed in twin children, a twinning effect that diminishes between 4 and 6 years of age in a population-based sample. The purposes of this study were to examine how twinning effects influence the identification of children with language impairments at 4 and 6 years of age, comparing children with specific language impairment (SLI) and nonspecific language impairment (NLI); the likelihood that affectedness will be shared within monozygotic versus dizygotic twin pairs; and estimated levels of heritability for SLI and NLI. Twinning effects are predicted to result in elevated rates of language impairments in twins. METHOD: The population-based twin sample included 1,354 children from 677 twin pairs, 214 monozygotic and 463 dizygotic, enrolled in a longitudinal study. Nine phenotypes from the same comprehensive direct behavioral assessment protocol were investigated at 4 and 6 years of age. Twinning effects were estimated for each phenotype at each age using structural equation models estimated via diagonally weighted least squares. Heritabilities were calculated for SLI and NLI. RESULTS: As predicted, the twinning effect increased the percentage of affected children in both groups across multiple language phenotypes, an effect that diminished with age yet was still not aligned to singleton age peers. Substantial heritability estimates replicated across language phenotypes and increased with age, even with the most lenient definition of affectedness, at −1 SD. Patterns of outcomes differed between SLI and NLI groups. CONCLUSIONS: Nonverbal IQ is not on the same causal pathway as language impairments. Twinning effects on language acquisition affect classification of 4- and 6-year-old children as SLI and NLI, and heritability is most consistent in the SLI group. Clinical practice requires monitoring language acquisition of twins to avoid misdiagnosis when young or a missed diagnosis of language impairments at school entry.
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Keyword:
Language
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URL: https://doi.org/10.1044/2019_JSLHR-19-00012 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7229710/ http://www.ncbi.nlm.nih.gov/pubmed/32163317
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Birth Prevalence of Congenital Cytomegalovirus Infection in HIV-Exposed Uninfected Children in the Era of Combination Antiretroviral Therapy
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In: J Pediatr (2019)
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Prenatal and perinatal risks for late language emergence in a population-level sample of twins at age 2
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Grammar Clinical Marker Yields Substantial Heritability for Language Impairments in 16-Year-Old Twins
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Risk for Speech and Language Impairments in Pre-school Aged HIV-Exposed Uninfected Children with in utero Combination Antiretroviral Exposure
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Mapping Chromosomal Loci in Specific Language Impairment: A Pedigree-Focused Approach
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Effects of Language Context on Ratings of Shy and Unsociable Behaviors in English Language Learning Children
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