Intelligence is dominated by genetics - long-term adoption studies results

[Deleted]

Interesting short video containing testimony from Professor Robert Plomin of King's College London, Professor of Behavioural Genetics and expert in Twin and Adoption studies:



One of the key papers that resulted from the research: http://www.jstor.org/stable/40063231

Abstract

Children increasingly resemble their parents in cognitive abilities from infancy through adolescence. Results obtained from a 20-year longitudinal adoption study of 245 adopted children and their biological and adoptive parents, as well as 245 matched nonadoptive (control) parents and offspring, show that this increasing resemblance is due to genetic factors. Adopted children resemble their adoptive parents slightly in early childhood but not at all in middle childhood or adolescence. In contrast, during childhood and adolescence, adopted children become more like their biological parents, and to the same degree as children and parents in control families. Although these results were strongest for general cognitive ability and verbal ability, similar results were found for other specific cognitive abilities--spatial ability, speed of processing, and recognition memory. These findings indicate that, within this population, genes that stably affect cognitive abilities in adulthood do not all come into play until adolescence and that environmental factors that contribute to cognitive development are not correlated with parents' cognitive ability.

[Xeones]

Of course intelligence is genetic. Intelligence is a measure of how the brain functions.

[Daneman]

This isn't something new, it's been known for a long time. People can continue denying the genetic influence in regards to a lot of things but that doesn't make it not genetic.

[Forogil]

You should have linked one of his later papers:
https://kclpure.kcl.ac.uk/portal/en/...28cad7b8).html
"The heritability of intelligence increases from about 20% in infancy to perhaps 80% in later adulthood"

This compares to about 60-80% heritability of length.
(Obviously it depends on both nurture - and the genetic variations in the population.)

[GennGreymane]

I am not too surprised.

[Ripster42]

Greater intelligence is also related to increased incidence of mental disorders. Not all that sweet.

[May90]

While this is pretty obvious that this is the case, I wonder how they define "intelligence" and what scale they use to determine it. So far I haven't seen a decent scale used in any studies, hence I always view them with suspicion.

[nanook12]

Greater intelligence is also related to increased incidence of mental disorders. Not all that sweet.

And the lack of intelligence is related to a host of bad things as well. Lower income being one of them.

[Deleted]

And the lack of intelligence is related to a host of bad things as well. Lower income being one of them.

Last I checked, you had two people running for the White House and neither of them would rank very high on my "Scale of intelligent people".

And both of them seem to be raking it home.

[nanook12]

Last I checked, you had two people running for the White House and neither of them would rank very high on my "Scale of intelligent people".

And both of them seem to be raking it home.

Lol "your scale" that's the problem.

[Reinhard von Lohengramm]

"I think the man on the street is a lot wiser about these things. I think the problem is Academics. You know, the people in their ivory towers who don't have children especially. They're the ones who have these preposterous theories that everything is environmental."

Shots fired at the "Women and Gender Studies" departments across the West with that.

[May90]

Last I checked, you had two people running for the White House and neither of them would rank very high on my "Scale of intelligent people".

And both of them seem to be raking it home.

Trump is an outlier though. Most stupid people, indeed, don't get very far in life - unless they have some specific talents, such as showmanship.

[Calfredd]

Life is not born equal.

And neither is man.

Darwin is correct, and all you idiots that think otherwise will be filtered out eventually.

How long is eventually? Because we still care for people who are born with the need to be taken care of for their entire lives (severe downs syndrome and extreme cases of autism for example).

[May90]

Life is not born equal.

And neither is man.

Darwin is correct, and all you idiots that think otherwise will be filtered out eventually.

Well, Darwin's theory surely didn't filter out people who spend their free time posting provocative things from fresh accounts.

[Xeones]

Last I checked, you had two people running for the White House and neither of them would rank very high on my "Scale of intelligent people".

And both of them seem to be raking it home.

Pretty sure the issue here is your scale, not them.

[Deleted]

Greater intelligence is also related to increased incidence of mental disorders. Not all that sweet.

The human evolution is still in progress (and always will be). Such trade-offs -- efficiency at the cost of durability -- aren't all that surprising.

It could also be that intelligent people experience more frustration, stress and eventually depression when surrounded by people who are intellectually several levels below them. Two people with a 50-point IQ difference can't even communicate properly.

[Elian]

must show this to a middle class social justice warrior who has been pampered by their parents since childhood.

[Deleted]

Good thing liberals don't breed huh?

[Deleted]

Interesting short video containing testimony from Professor Robert Plomin of King's College London, Professor of Behavioural Genetics and expert in Twin and Adoption studies:



One of the key papers that resulted from the research: http://www.jstor.org/stable/40063231

Abstract

Yet, if you cannot nurture good development, nothing good will happen.