Low Expressive Vocabulary: Higher Heritability as a Function of More Severe Cases.
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| Title: | Low Expressive Vocabulary: Higher Heritability as a Function of More Severe Cases. |
|---|---|
| Authors: | DeThorne, Laura S.1 lauras@uiuc.edu, Petrill, Stephen A.1, Hayiou-Thomas, Marianna E.2, Plomin, Robert3 |
| Source: | Journal of Speech, Language & Hearing Research. Aug2005, Vol. 48 Issue 4, p792-804. 13p. |
| Subject Terms: | *Language disorders, *Vocabulary, *Cognitive ability, *Communicative disorders, *Diction |
| Abstract: | This study of 4,274 pairs of 4-year-old twins from the Twins Early Development Study explored the magnitude of genetic and environmental effects on low expressive vocabulary skill, both as a function of general cognitive ability and as a function of the severity of expressive vocabulary impairment. Assessments were conducted through parent report measures. Two types of vocabulary deficit were identified: low vocabulary paired with typical general cognition (i.e., specific expressive vocabulary impairment) and low vocabulary paired with low general cognition (i.e., nonspecific expressive vocabulary impairment). The magnitude of genetic and environmental effects on low expressive vocabulary skill did not differ for these 2 types of expressive vocabulary deficit. By systematically varying the cutoffs used to define vocabulary and general cognitive delay, potential changes in the magnitude of genetic and environmental effects were examined. Results suggested that the severity of vocabulary deficit rather than level of cognitive functioning was a more meaningful etiological distinction: The heritability of low expressive vocabulary was higher and the influence of shared environment lower, as increasingly severe vocabulary deficits were identified. Implications for molecular genetics and the construct of specific language deficits are discussed. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Speech, Language & Hearing Research is the property of American Speech-Language-Hearing Association and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Education Research Complete |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: ehh DbLabel: Education Research Complete An: 19286472 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=ehh&AN=19286472 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1044/1092-4388(2005/055) Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 792 Subjects: – SubjectFull: Language disorders Type: general – SubjectFull: Vocabulary Type: general – SubjectFull: Cognitive ability Type: general – SubjectFull: Communicative disorders Type: general – SubjectFull: Diction Type: general Titles: – TitleFull: Low Expressive Vocabulary: Higher Heritability as a Function of More Severe Cases. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: DeThorne, Laura S. – PersonEntity: Name: NameFull: Petrill, Stephen A. – PersonEntity: Name: NameFull: Hayiou-Thomas, Marianna E. – PersonEntity: Name: NameFull: Plomin, Robert IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 10924388 Numbering: – Type: volume Value: 48 – Type: issue Value: 4 Titles: – TitleFull: Journal of Speech, Language & Hearing Research Type: main |
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