Everything in here seems right, but I haven’t heard other people/experts in the field talk about this nearly as much as I would expect them to if it were true.
That means things like your friends, your schoolteachers, and even that time you and your twin got sent away to separate camps must be really important.
More than enough there to continue worrying about how society is Ruining The Children, right? Non-shared environment isn’t really “non-shared environment” the way you would think. Anything that isn’t genetic or family-related gets tossed into the non-shared environment term.
So it looks like much of the non-shared environmental variation in traditional studies of personality was just error. His identical twin Rob becomes a junior advertising executive at Pepsi-Cola, where he designs his own new ad targeting young female consumers.
Both ads are very successful – in fact, exactly equally successful.
Riemann and Kandler obsessively collect every possible measurement of personality – self-report, other-report, multiple different tests – and average them out to get an unusually accurate and low-noise estimate of the personality of the twins in their study.
They find that variation in personality is about 85% genetic, 15% non-shared environmental. Bob becomes a junior advertising executive at Coca-Cola, where he designs a new ad targeting young female consumers.Science reporters read the study finding that much of the variation in income is non-shared environmental, and conclude that despite their identical genes, there must be deep and mysterious differences in Bob and Rob’s abilities and business acumen.They speculate that Rob had a very inspirational teacher in school who pushed him to achieve greatness, and Bob must have fallen in with a bad peer group who didn’t value hard work.But actually, Bob and Rob are completely identical in every way, no incident in their past did anything to separate them, and Bob just ended up working for a crappy CEO.In this scenario, inherent predisposition to earning money is exactly the same in both twins, they just have different amounts of luck at it. The genome can’t encode the location of every cell in the body.But at least (these scholars of social behavior could tell themselves) it provided a consolation prize.