A couple ofidentical twinswho were raised in separate land have displayed unexpectedly large disparity in cognitive abilities while exhibiting extremely similar personality traits . A comparison of the monozygotic sibling ’s machine characteristic sheds unexampled light on the age - oldnature / rearing debate .

hold in Seoul , South Korea , in 1974 , the Sister became separated at the age of two when one twin got lost at a grocery . Despite her parent ’ appearance on a tv program about missing persons , the young girl could not be reunify with her family and ended up being adopted by a twosome in the US .

Growing up stateside , the take in twin was unaware that she even had any siblings until she submitted her DNA to South Korea ’s program for reunite fellowship members in 2018 . Two years later , she get word that she not only had an identical twin , but an older brother and sister too .

Having been reunited , the Twin Falls then finish a serial publication of tests design to assess their intelligence information , personality profiles , genial health , and aesculapian history . Somewhat surprisingly , results revealed that the intelligence quotient of the similitude advance in the US was 16 stop lower than that of the Korean - raised sib .

The findings negate former studies onmonozygotic twins , which have indicated an average IQ difference of no more than seven full point . Commenting on the unexpectedly large gulf between the two sisters , the subject field author compose that “ it is striking that the twins showed substantial differences in cognitive power that have been linked to strong genetic influence . ”

Whether this variance was because of the Twin Falls ’ unlike upbringings is hard to say , although the researchers mark that the sister raised in the US had suffered three previous concussions , which may have mold her cognitive capacities .

continue their assessment of the twain , the researchers go on to reveal that “ the overall configuration of the similitude ' personality was similar , coherent with the literature on moderate genetic influence on personality in adulthood . ”

“ Notable is that both Gemini are distinctively high on Conscientiousness , indicating that both are purposeful , well - engineer , duteous , and accomplishment - strain . ” That these similarities persisted despite the sister ’ counterpoint animation experiences and home environment is interesting , and spotlight the role thatgeneticsplay in determining aperson ’s disposition .

For example , while the twin raise in Korea distinguish grow up in a loving and symmetrical family abode , the adopted baby cover a abrasive upbringing , colored by veritable battle and the divorcement of her adopted parents . Despite this , the pair had monovular scores for self - esteem and highly similar mental health profiles .

The pair also portion out scene of their medical history , with both experience undergone surgery to remove neoplasm from their ovaries . However , the twins take issue with heed to their culturally imprint ideologies , with the US - invoke sibling demonstrating a more individualist mentality while the sister raised in Korea had more collectivist values .

Understandably , instance of Twin Falls being raised individually are rarified , and more cases like this need to be studied before any firm conclusions can be drag . Nonetheless , this written report provides some fascinating young insights into the transmissible , cultural , and environmental factor that tempt human development .

The study is bring out in the journalPersonality and Individual Differences .