Variability and stability in cognitive abilities are largely genetic later in life.

@article{Plomin1994VariabilityAS,
  title={Variability and stability in cognitive abilities are largely genetic later in life.},
  author={Robert Plomin and Nancy L Pedersen and Paul Lichtenstein and Gerald E Mcclearn},
  journal={Behavior genetics},
  year={1994},
  volume={24 3},
  pages={207-15}
}
The powerful quantitative genetic design of identical and fraternal twins reared apart (112 pairs) and matched twins reared together (111 pairs) was employed to assess the extent of genetic influence on individual differences in cognitive abilities during the last half of the life span. General cognitive ability yielded a heritability estimate of about .80 in two assessments 3 years apart as part of the Swedish Adoption/Twin Study of Aging. This is one of the highest heritabilities reported for… CONTINUE READING

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