science

This website's use of stock images and gifs were aggravating. The actual case study was worth the read, but only covers a single pair of individuals: https://www.sciencedirect.com/science/article/pii/S0191886922001477

It's certainly interesting. I'm particularly curious about the effects of the multiple confusions:

US had three concussions as an adult, caused by car accidents and from falling on ice. The most recent and severe incident occurred in January 2018, resulting in classic symptoms of light sensitivity and concentration difficulty. US feels she is a “different person,” with increased anger and anxiety. She requires additional time to process information in some problem-solving situations, although she has always seen herself as a poor test taker.

Some of the conclusions seemed a stretch for a single sample. I'm much more curious about more extensive studies with many more subjects.

If anyone else is wondering why their faces on the image are not identical: its a representative stock pic

With america being the shitshow that it is I am not surprised

I do hope she could move back and get the support of the family in South Korea because she shouldn't have to live in that sithole anymore

Look at what Americans consume. There's your answer.

There's link for the study: https://www.sciencedirect.com/science/article/pii/S0191886922001477

Personality traits, mental abilities and other individual differences: Monozygotic female twins raised apart in South Korea and the United States by Nancy L. Segal and Yoon-Mi Hur

16 points, so about a standard deviation. That's big, but your own varience can be just as high; the original point of IQ is a measure of how well you'll do in school to detect who may need additional attention (and not an inherent intelligence) so later aged tests include more on knowledge base while earlier tests are more about things like pattern recognition, mental rotation, etc. Infact, it has to get recurved regularly as each generation tends to be roughly 10 or 15 points higher (although idk about gen Z).

All this is to say that a slump of 16 points doesn't have to be shit like lead poisoning or gas fumes (although that certainly doesn't help, and pollution matters), it can simply be the US education system isn't good at teaching students. Cross culture studies already show that, as do differences between the rich and the poor. Or hell, just playing Tetris raises IQ, lol.

It'd obviously help if this wasn't a click bait article, though. People wanting to know why need to read a lot of actual research to know the myriad of different things that impact IQ and not just "haha US stupid."

the researchers note that the sister raised in the US had suffered three previous concussions

+

the twin raised in Korea described growing up in a loving and harmonious family home, the adopted sister reported a harsher upbringing, colored by regular conflict and the divorce of her adoptive parents

It does seem as if there would be explanations for the unusual difference.

https://www.iflscience.com/identical-twins-raised-in-the-us-and-korea-display-surprising-iq-variations-71357

I have children. The amount of trauma a two year old would experience losing their family, being transported to a foreign country and adopted by different people would be ~~traumatic~~intense as hell.

A two year old is not a newborn. That's their entire world blowing up.

while the other faced hardships with her adoptive family and parents

Does anyone have more info? Abuse, neglect, and malnutrition are proven to reduce IQ. So are the concussions referenced in the article. I would be dubious to make any statements on the back of a single case like this. This is not even outside the realm of possibility of twin IQ variance - albeit unlikely.

The headline alone just outright insults the other twin. lmao wtf

iq still a thing?

This summer, they're gonna get their parents back together!

The sister raised in the US had an IQ 16 points lower than her sibling in Korea. Previous studies revealed that identical twins typically have no more than a 7-point IQ difference, making this case astounding.