PMID 9171059
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- Title
Substantial genetic influence on cognitive abilities in twins 80 or more years old.
- Authors
McClearn GE, Johansson B, Berg S, Pedersen NL, Ahern F, Petrill SA, Plomin R
- Year
1997
- Abstract
General and specific cognitive abilities were studied in intact Swedish same-sex twin pairs 80 or more years old for whom neither twin had major cognitive, sensory, or motor impairment. Resemblance for 110 identical twin pairs significantly exceeded resemblance for 130 fraternal same-sex twin pairs for all abilities. Maximum-likelihood model-fitting estimates of heritability were 62 percent for general cognitive ability, 55 percent for verbal ability, 32 percent for spatial ability, 62 percent for speed of processing, and 52 percent for memory. There was also evidence for the significant influence of idiosyncratic experience as the environmental component that most determines individual differences in cognitive abilities late in life.
- Keywords
Aged, Aged, 80 and over, Aging, Cognition, Environment, Female, Humans, Intelligence, Intelligence Tests, Likelihood Functions, Male, Registries, Sweden, Twins, Dizygotic, Twins, Monozygotic
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