The equal environments assumption of classical twin studies may not hold.

@article{Richardson2005TheEE,
  title={The equal environments assumption of classical twin studies may not hold.},
  author={K. Richardson and S. Norgate},
  journal={The British journal of educational psychology},
  year={2005},
  volume={75 Pt 3},
  pages={
          339-50
        }
}
The classical twin method - comprising comparisons of monozygotic (MZ) and dizygotic (DZ) twins - in the domain of cognitive abilities and attainments has led to wide acceptance of results suggesting a large amount of additive genetic variance, with far-reaching implications both for the nature of future studies on the causes of cognitive variance and for intervention policies, as in education. However, this interpretation is only valid if the method observes a number of conditions, which have… Expand
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