The finding that environmental variance in some traits is explained only by non-shared environments, and not at all by shared environments, is, while true, very confusing given that environments all presumably impact the same factors in the brain whether they are shared or not...
...and surely the brain doesn't "care" whether certain neurons were impacted by a shared or unshared environment, and"shared" / "unshared" seems like such an artificial distinctions it seems bizarre that they would map on so well to real vs non real environmental effects. Of...
...course, this all has an explanation, eg non-shared environments systematically impact different brain regions, but I don't know what it is in any detail, and any such explanation seems to require an explanation of its own. (Obviously, I'm not talking about traits where...
...c falls to zero only in later life, which has an obvious explanation).
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