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Using Cholesky Decomposition to Explore Individual Differences in Longitudinal Relations between Reading Skills
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Longitudinal stability in reading comprehension is largely heritable from grades 1 to 6.

Brooke Soden1, Micaela E Christopher2, Jacqueline Hulslander3

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Genetic factors significantly influence reading comprehension stability from 1st to 6th grade. While the environment is crucial for learning to read, ongoing genetic influences shape reading development over time.

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Area of Science:

  • Behavioral Genetics
  • Developmental Psychology
  • Educational Psychology

Background:

  • Reading comprehension is a fundamental academic skill crucial for learning.
  • Understanding the influences on reading development is vital for educational interventions.
  • Previous research has not comprehensively examined the stability of genetic and environmental influences on reading comprehension across elementary grades.

Purpose of the Study:

  • To investigate the stability and change in genetic and environmental influences on reading comprehension from 1st to 6th grade.
  • To determine how these influences shift as children transition from learning to read to using reading for learning.
  • To provide insights into the developmental trajectory of reading comprehension.

Main Methods:

  • Longitudinal simplex models were employed.
  • Two independent twin samples were analyzed (N = 706 and N = 976).
  • Data were collected across Grades 1 to 6.

Main Results:

  • Shared environmental influences were significant for early reading but diminished in later grades.
  • Continuous genetic influences were the primary mediators of stability in reading development.
  • Individual differences in reading comprehension showed a core of genetic stability throughout elementary school.

Conclusions:

  • Reading is a learned skill, and environmental factors remain important.
  • Genetic factors play a persistent role in maintaining individual differences in reading comprehension.
  • The findings highlight the complex interplay of genetics and environment in reading development.