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Not sure what you mean precisely. Yes lots if work in IQ, but that does not mean there is a grand consensus. I am a geneticist who studies cognitive function. T

Not sure what you mean precisely. Yes lots if work in IQ, but that does not mean there is a grand consensus. I am a geneticist who studies cognitive function. The single most common misunderstanding about estimates of heritability is that a high heritability implies full genetic causation without potential malleability. That is total wrong. Heritability is always measured in the context of Environment X. If you change to Environment Y or Z then the heritability will often change greatly.

cakealert 1y ago
Unfortunately most of the malleability is non-systematic (can't be engineered by a third party). Which means it's caused by the nonlinear dynamics between the genes and environment.
hirvi74 1y ago
As a geneticist who studies cognitive function, if you get a moment, do you mind reading this blog [1] and stating if you think it's factually correct or not? My genes are too poor, and thus, my IQ is likely too low for me to be certain I can trust my own opinions on the matter. [1] http://bactra.org/weblog/520.html http://bactra.org/weblog/520.html
EnPissant 1y ago
> Heritability is always measured in the context of Environment X. If you change to Environment Y or Z then the heritability will often change greatly. That's not a very meaningful statement. If you took two twins and severely malnourished one of them it would not be useful to say: "See! IQ is mostly environmental!". You have to assume some kind of baseline environment that nearly everyone will share, and that can be full-filled just by the virtue of growing up in a country like America. Otherwise, you are just concerning yourself with insignificant outliers. Here is a twin study that places the heritability at ~80%: https://www.cambridge.org/core/journals/twin-research-and-human-genetics/article/wilson-effect-the-increase-in-heritability-of-iq-with-age/FF406CC4CF286D78AF72C9E7EF9B5E3F https://www.cambridge.org/core/journals/twin-research-and-hu...
- robwwilliams 1y ago
  Wow, a baseline environment everyone in America shares. Come visit Memphis.
  - EnPissant 1y ago
    Do you think that twin study included any children raised in a Memphis ghetto?

cakealert 1y ago

Unfortunately most of the malleability is non-systematic (can't be engineered by a third party). Which means it's caused by the nonlinear dynamics between the genes and environment.

hirvi74 1y ago

As a geneticist who studies cognitive function, if you get a moment, do you mind reading this blog [1] and stating if you think it's factually correct or not? My genes are too poor, and thus, my IQ is likely too low for me to be certain I can trust my own opinions on the matter. [1] http://bactra.org/weblog/520.html http://bactra.org/weblog/520.html

EnPissant 1y ago

> Heritability is always measured in the context of Environment X. If you change to Environment Y or Z then the heritability will often change greatly. That's not a very meaningful statement. If you took two twins and severely malnourished one of them it would not be useful to say: "See! IQ is mostly environmental!". You have to assume some kind of baseline environment that nearly everyone will share, and that can be full-filled just by the virtue of growing up in a country like America. Otherwise, you are just concerning yourself with insignificant outliers. Here is a twin study that places the heritability at ~80%: https://www.cambridge.org/core/journals/twin-research-and-human-genetics/article/wilson-effect-the-increase-in-heritability-of-iq-with-age/FF406CC4CF286D78AF72C9E7EF9B5E3F https://www.cambridge.org/core/journals/twin-research-and-hu...

robwwilliams 1y ago
Wow, a baseline environment everyone in America shares. Come visit Memphis.
- EnPissant 1y ago
  Do you think that twin study included any children raised in a Memphis ghetto?