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Is this proof that intelligence is 'set' the day we're born? Identical twins separated at birth have near-identical IQs, fascinating study from the world's leading expert in twins reveals READ MORE: Exposure to chemical could cause shrunken heads in newborns By John Ely Deputy Health Editor For Mailonline Published: 09:00 EDT, 1 July 2024 | Updated: 09:32 EDT, 1 July 2024 e-mail 28 View comments Identical Chinese twins separated at birth by the nation's draconian one-child policy grew up to have almost identical IQs, a fascinating study reveals. The research, led by Dr Nancy Segal an expert in psychology from the University of California , considered one of the world's leading experts on twins, examined the intelligence scores of 15 pairs of identical twins adopted by different families. Fourteen pairs of twins were female due to Chinese culture traditionally favouring male children, a bias which led to female children, including twins, being abandoned by parents during China 's one-child policy which ran from 1980 to 2016.
These genetically identical twins were separated and raised in different environments — and sometimes even in different countries. This provided scientists with the rare opportunity to test if nature or nurture was the most important factor for IQ. Research, led by Dr Nancy Segal an expert in psychology from the University of California and considered one of the world's leading experts on twins, examined the IQs of 15 pairs of identical twins adopted by .
