Identical Twins Raised in US/South Korea Show Major Intellectual Differences

Common belief: twins share similar intellect. Case of twins raised in different countries reignites nature/nurture debate on cognitive skills.

Identical Twins in Different Countries

Gemelas idénticas criadas en Estados Unidos y Corea del Sur muestran grandes diferencias intelectuales — **Marked IQ differences.**

Born Seoul, South Korea 1974; separated age 2—one lost at market. Despite TV pleas, US adoption followed.

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US-raised twin unaware of siblings until 2018 DNA test reunited family. 2020: discovered identical twin.

Post-reunion tests assessed intelligence, personality, mental health, medical history. Shock: US twin’s IQ 16 points lower than Korean twin.

Personality and Individual Differences publication contradicts prior monozygotic twin studies (avg IQ gap ≤7). Authors: “Surprising substantial cognitive differences linked to strong genetics.”

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Unclear if upbringing caused gap; US twin had 3 prior concussions possibly impacting cognition.

Genetically Identical, Ideologically Divergent

Personality profiles similar—consistent with adult genetic moderation. Both high Conscientiousness: purposeful, organized, obedient, achievement-driven.

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Researchers: intriguing similarities persist despite divergent life experiences/homes—highlights genetics in temperament.

Korean twin: warm, loving, harmonious home. US twin: harsh, conflict-filled, adoptive parents divorced. Yet identical self-esteem/mental health scores.

Shared medical: both ovarian tumor surgeries. But cultural ideologies differed: US more individualist, Korean collectivist.

Separated twin cases rare—needs more study. Still, offers fresh genetic/cultural/environmental insights on human development.

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