Researchers have taken advantage of a rare opportunity to study identical (aka monozygotic) twins who were separated early in life, before being raised in different countries by different families – and there are some surprising results to report.
– with twins usually scoring roughly the same on cognitive tests – in this case there was a substantial 16-point difference between the siblings.
"Similarities were evident in personality, self-esteem, mental health, job satisfaction, and medical life history," the researchers write in their"In contrast with previous research, the twins' general intelligence and non-verbal reasoning scores showed some marked differences." Despite many similarities – including in the areas of mental health and job satisfaction – the twin raised at home in South Korea scored more highly in terms of perceptual reasoning and processing speed.
What's also worth taking into consideration is that the family homes the twins were raised in were not at all similar, besides being in completely different parts of the world. There was more conflict and less freedom in the US home compared with the one in South Korea, the researchers report.
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