Outcomes of Early Language Delay: II. Etiology of Transient and Persistent Language Difficulties.
Genes are known to play an important role in causing specific language impairment, but it is unclear how far a similar etiology is implicated in transient language delay in early childhood. Two-year-old children with vocabulary scores below the 10th centile were selected from a cohort of over 2,800...
| Publicado en: | Journal of Speech, Language & Hearing Research Vol. 46; no. 3; pp. 561 - 576 |
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| Autores principales: | , , |
| Formato: | Artículo |
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American Speech-Language-Hearing Association
June 2003
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=507834599&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 507834599 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 10924388 1SM jtl: Journal of Speech, Language & Hearing Research issn: 10924388 maglogo: N pubinfo: dt: June 2003 vid: 46 iid: 3 pid: 42 pub: American Speech-Language-Hearing Association artinfo: ui: 507834599 10.1044/1092-4388(2003/045) ppf: 561 ppct: 15 formats: fmt: – @attributes: type: T – @attributes: type: P size: 287KB tig: atl: Outcomes of Early Language Delay: II. Etiology of Transient and Persistent Language Difficulties. aug: au: Bishop, Dorothy V. M. Price, Thomas S. Dale, Philip S. ab: Genes are known to play an important role in causing specific language impairment, but it is unclear how far a similar etiology is implicated in transient language delay in early childhood. Two-year-old children with vocabulary scores below the 10th centile were selected from a cohort of over 2,800 same-sex twin pairs whose language was assessed by parental report at 2, 3, and 4 years of age. These children with early language delay (ELD) were divided into cases of transient and persistent language difficulties on the basis of outcome at 3 and 4 years. A DeFries-Fulker analysis (J. C. DeFries & D. W. Fulker, 1985) was used to compute group heritability (h2 g) of 2-year vocabulary delay separately for those with transient and persistent difficulties. When 3-year and 4-year language attainments were used to categorize outcomes, h2g was similar and modest (.25 or less) for both transient and persistent difficulties. However, when persistent difficulties were defined according to whether parents expressed concern about language at 3 years or according to whether a professional had been consulted about language difficulties at 4 years, heritability was significantly higher. For 289 children with no professional involvement at 4 years, heritability of 2-year vocabulary delay was close to zero, whereas for 134 children with professional involvement, a significant h2g of .41 (SE= .127) was found. Early language delay appears largely environmental in origin for 2-year-olds whose parents do not go on to seek professional help. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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