[pendenthistory]

It's also just common sense. Everyone agrees that traits like height is heritable, but somehow whatever goes on inside the brain is not? The null hypothesis here is that it is heritable, and I see no proof whatsoever against that hypothesis. My personal experience raising my own kids and observing countless others confirms common sense. Your own child is not one data point, it's a million small data points, things you notice in what they're like as a baby, and how they develop over time. Only someone without kids would boil this down to a "single data point". I also deny that I have do anything to prove heritability, how about you prove the opposite? It's a conclusion that is so obvious to the impartial mind that to be confused about it is a sign of extreme ideological indoctrination. To deny heritability of personality and intelligence is to deny evolution itself.

[davidbessis]

No-one is denying heritability here. The only question is where the heritability figure lies, and how reliable are the estimates that have been put forward in the past. I don't see how anyone's "personal experience" could be a valid methodology for deciding whether the heritability of IQ is 30% or 80%. As for the "extreme ideological indoctrination" slander, it'd be great if you could just withdraw it.

[satisfice]

I agree. A child is a million small datapoints. My son established a strong personality early on that defied our attempts to modify it. Meanwhile he was raised in a relaxed environment that certainly provided no environmental explanation for his fixations.

I was raised with five siblings, yet only I got into fights at school, and made my mother cry on a regular basis. Each of my sibs is similar and each of us is strikingly different, too.

[derriz]

> It's also just common sense.

Centuries of success with empirical based science is a direct rejection of the approach of trusting "just common sense".

> Only someone without kids would boil this down to a "single data point".

Why are you personalizing this? I have a family and have observed children grow from emergence from the womb and I grew in a much larger family. I'm not sure what the relevance is to the points being discussed. This seems like argument by anecdotal fallacy.

> I also deny that I have do anything to prove heritability, how about you prove the opposite?

I didn't ask you to prove anything. I asked you why you have no interest in looking at a scientific question beyond "I trust my own observations and my conclusion"?

And this question seemingly misses the point - it not a binary question about whether traits are inherited or not but about the degree of the role of inheritance. The author of the piece emphasizes this point extensively.

The salient point of the too-long article was about flaws in a seminal paper on this subject where the author Bouchard presented carefully collected data for identical twins - showing remarkably low variance suggesting a high degree of inheritance. But he hid the data he had collected for non-identical twins, which would have provided us with a basis for judging the significance of the findings regarding identical twins.

> It's a conclusion that is so obvious to the impartial mind that to be confused about it is a sign of extreme ideological indoctrination.

Can we just discuss the science and statistics here?