An investigation of the difference in measured intelligence between twins and single births.

@article{Record1970AnIO,
  title={An investigation of the difference in measured intelligence between twins and single births.},
  author={R G Record and Thomas McKeown and Judge Harry Edwards},
  journal={Annals of human genetics},
  year={1970},
  volume={34 1},
  pages={11-20}
}
Several investigations have shown that mean scores in intelligence tests are lower (by about 5 points on the conventional scale with mean of 100) for twins than for single births (Mehrotra & Maxwell, 1949; Sandon, 1957; Drillien, 1961). The reasons for the difference are by no means clear. It has been suggested on tbe one hand that they may result mainly from prenatal influences (Churchill, 1965) and on the other that they are more likely to be due to postnatal verbal handicaps experienced by… CONTINUE READING

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