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A Longitudinal Genetic Study of Vocabulary Knowledge in Adults

  • Stéphanie M. van den Berg (a1), Daniëlle Posthuma (a2) and Dorret I. Boomsma (a3)
Abstract
Abstract

Vocabulary test scores were obtained from a total of 997 adults, all twins or a sibling of twins in this study. Some (N = 217) individuals were tested twice, around 6 years apart. Heritability varied from 50% at the first test occasion to 63% at the second test occasion. The correlation of scores across time was .74. Structural equation modelling showed that stability in vocabulary knowledge over time can largely (around 76%) be explained by genetic factors. Part of the non-shared environmental variance was stable over time also. Any influence from shared environmental factors could not be detected. Results were similar for the two sexes, except that males generally outperformed females. Results were also similar for two age cohorts, except that the older cohort generally outperformed the younger cohort.

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Copyright
Corresponding author
*Address for correspondence: Stéphanie M. van den Berg, Vrije Universiteit Amsterdam, Department of Biological Psychology, Van der Boechorststraat 1, 1081 BT Amsterdam, the Netherlands.
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Twin Research and Human Genetics
  • ISSN: 1832-4274
  • EISSN: 1839-2628
  • URL: /core/journals/twin-research-and-human-genetics
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