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laconicsax

(14,860 posts)
5. It's known that hormone levels in the fetus and womb affect brain development.
Sun May 20, 2012, 02:45 PM
May 2012

That seems to be a plausible mechanism for what causes the structural differences and it's possible that the ability for those differences to be undone by nurture is the result of evolutionary pressures--individuals with exaggerated cognitive differences may not have fared as well.

Of course that's speculation, but not being a scientist in the field, that's the most I can do.

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