Identical Twins, Raised in US, Foreign Country, Guess Which One Had a Much Higher IQ
A pair of identical twins who were raised in separate countries have displayed unexpectedly large disparities in cognitive abilities while exhibiting highly similar personality traits. A comparison of the monozygotic sibling’s characteristics sheds new light on the age-old nature/nurture debate.
Growing up stateside, the adopted twin was unaware that she even had any siblings until she submitted her DNA to South Korea’s program for reuniting family members in 2018. Two years later, she received word that she not only had an identical twin, but an older brother and sister too.
Having been reunited, the twins then completed a series of tests designed to assess their intelligence, personality profiles, mental health, and medical history. Somewhat surprisingly, results revealed that the IQ of the twin raised in the US was 16 points lower than that of the Korean-raised sibling.
The finding, published in the journal Personality and Individual Differences, contradicts previous studies on monozygotic twins, which have indicated an average IQ difference of no more than seven points. Commenting on the unexpectedly large gulf between the two sisters, the study authors write that “it is striking that the twins showed substantial differences in cognitive abilities that have been linked to strong genetic influence.” . . .
“Notable is that both twins are distinctively high on Conscientiousness, indicating that both are purposeful, well-organized, dutiful, and achievement-striving.” That these similarities persisted despite the sisters’ contrasting life experiences and home environments is interesting, and highlights the role that genetics play in determining a person’s temperament. (Read more from “Identical Twins, Raised in US, Foreign Country, Guess Which One Had a Much Higher IQ” HERE)
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