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A twin study of mathematics disability

M Alarcón1, J C DeFries, J G Light

  • 1Department of Psychology, University of Colorado, Boulder, USA.

Journal of Learning Disabilities
|November 19, 1997
PubMed
Summary

This study found that mathematics disability (MD) has a significant genetic basis. Further research with more twin pairs is needed to explore the specific genetic causes of MD.

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Area of Science:

  • Behavioral Genetics
  • Developmental Psychology
  • Educational Psychology

Background:

  • Individual differences in math performance show heritable influences.
  • No prior genetic analyses of mathematics disability (MD) existed.

Purpose of the Study:

  • To conduct the first twin study on mathematics disability (MD).
  • To investigate the genetic etiology of MD.

Main Methods:

  • Ascertained the first twin sample for mathematics deficits.
  • Included 40 identical and 23 same-sex fraternal twin pairs.
  • Utilized multiple regression analysis on mathematics performance data.

Main Results:

  • Evidence for a significant genetic etiology of MD was found.
  • Tests for differential etiology based on reading performance were nonsignificant.

Conclusions:

  • Mathematics disability (MD) is significantly heritable.
  • Additional twin data are necessary for rigorous testing of differential etiology hypotheses.

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