[runamok]

They seem to have accounted for that: > These differences weren’t present at birth, Wolfe says. “We found that before age 1, infants’ brains were basically the same, regardless of whether or not they were growing up in a poor family. But then as we traced them to age 4, we found areas that were developing more slowly among infants in low-income families.”

I don't think anyone discounts genetics completely. I just think for something like your mental capacity as a human will vary dramatically by your upbringing and teachings.

Take your 'high quality animal' and starve it occasionally. Wake it up with sirens. Beat it regularly and capriciously. Injure it. Compare that to one that is treated well but 'poor quality'. Also are we testing these animals in a maze or just size, speed, strength?

[reasonishy]

“We found that before age 1, infants’ brains were basically the same, regardless of whether or not they were growing up in a poor family."

What does that show? I'm sure if you checked the sperm and egg you could say "they're basically the same". All that means is the brain isn't fully developed before the age of 1. Big whoop.