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Cognitive resemblance in reading-disabled twins.

H Z Ho1, S N Decker

  • 1Department of Psychology, University of California, Santa Barbara 93106.

Developmental Medicine and Child Neurology
|February 1, 1988
PubMed
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Reading disabilities in twins are linked to lower cognitive abilities in reading, processing speed, and memory. Genetic factors significantly influence these cognitive deficits in reading-disabled individuals.

Area of Science:

  • Cognitive neuroscience
  • Behavioral genetics
  • Developmental psychology

Background:

  • Reading disabilities affect a significant portion of the population, impacting academic and life outcomes.
  • Twin studies are crucial for disentangling genetic and environmental influences on complex traits like reading ability.

Purpose of the Study:

  • To investigate the cognitive profiles of reading-disabled twins.
  • To determine the extent to which genetic factors contribute to cognitive deficits associated with reading disabilities.

Main Methods:

  • Recruited 60 pairs of twins (aged 8-18 years), with at least one twin diagnosed with a reading disability.
  • Administered nine cognitive tests to assess various cognitive abilities.
  • Utilized principal component analysis to identify underlying cognitive composites.

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Main Results:

  • Identified three key cognitive composites: reading, symbol-processing speed, and sequential memory.
  • Reading-disabled twins scored significantly lower on all three cognitive composites compared to normal readers.
  • Genetic differences accounted for individual variations in these cognitive composites within the reading-disabled sample.

Conclusions:

  • Cognitive deficits in reading, processing speed, and memory are characteristic of reading disabilities.
  • These cognitive deficits, particularly in the reading composite, appear to be heritable.
  • Findings underscore the significant role of genetic factors in the etiology of reading disabilities.