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Familial aggregation in specific language impairment.

P Tallal1, R Ross, S Curtiss

  • 1Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ.

The Journal of Speech and Hearing Disorders
|May 1, 1989
PubMed
Summary
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Children with specific developmental language impairment have more relatives with similar language or learning disabilities. This suggests a familial link, but whether it is genetic or environmental needs further investigation.

Area of Science:

  • Developmental Psychology
  • Genetics
  • Linguistics

Background:

  • Specific developmental language impairment (DLI) affects children's language acquisition.
  • Understanding the causes of DLI, including familial aggregation, is crucial for early intervention.

Purpose of the Study:

  • To assess the familial aggregation of specific developmental language impairment.
  • To investigate if DLI is more common in relatives of affected children compared to controls.

Main Methods:

  • Utilized self-report data from families in the San Diego Longitudinal Study.
  • Compared rates of language and/or learning disabilities in first-degree relatives of children with DLI versus matched controls.

Main Results:

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  • Families of children with DLI reported higher rates of affected first-degree relatives.
  • Significantly higher incidences of maternal, paternal, and sibling language and/or learning disabilities were reported in families with DLI.

    • Conclusions:

    • Evidence suggests familial aggregation in specific developmental language impairment.
    • Further research is needed to determine the genetic versus environmental contributions to DLI.