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Genetic and environmental influences on individual differences in printed word recognition.

Javier Gayán1, Richard K Olson

  • 1Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK. gayan@wel.ox.ac.uk

Journal of Experimental Child Psychology
|March 1, 2003
PubMed
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Genetic and environmental factors influence reading skills. Shared and unique genetic effects impact intelligence (IQ), phoneme awareness, and word recognition, particularly phonological and orthographic coding.

Area of Science:

  • Behavioral Genetics
  • Developmental Psychology
  • Cognitive Neuroscience

Background:

  • Individual differences in reading skills are influenced by complex genetic and environmental factors.
  • Understanding the etiology of reading abilities is crucial for identifying and addressing reading disabilities.

Purpose of the Study:

  • To investigate the genetic and environmental influences on individual differences in printed word recognition and related cognitive skills.
  • To examine the interplay of genetic factors across intelligence (IQ), phoneme awareness, word recognition, phonological decoding, and orthographic coding.

Main Methods:

  • A twin study design involving 440 identical and fraternal twin pairs aged 8–18 years.
  • A theoretically driven measurement model to identify latent variables (IQ, phoneme awareness, word recognition, phonological decoding, orthographic coding).

Related Experiment Videos

  • Cholesky decomposition models to analyze genetic and environmental influences on these latent constructs.

    • Main Results:

    • Evidence of both common and independent genetic effects, as well as non-shared environmental influences on reading-related skills.
    • Moderate genetic influences were common between IQ, phoneme awareness, and word recognition.
    • Stronger IQ-independent genetic influences were found between phoneme awareness and word recognition, especially phonological decoding.
    • Phonological and orthographic coding demonstrated significant common and independent genetic influences.

    Conclusions:

    • Reading skills are heritable, with both shared and unique genetic factors contributing to their development.
    • The findings have implications for understanding different reading models (dual-route, connectionist), subtypes of reading disabilities, and developing effective remediation strategies.