Low expressive vocabulary: higher heritability as a function of more severe cases.

@article{DeThorne2005LowEV,
  title={Low expressive vocabulary: higher heritability as a function of more severe cases.},
  author={Laura DeThorne and Stephen A. Petrill and Marianna E. Hayiou-Thomas and Robert Plomin},
  journal={Journal of speech, language, and hearing research : JSLHR},
  year={2005},
  volume={48 4},
  pages={792-804}
}
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… CONTINUE READING

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