Over on GNXP, Darth Quixote offers a thorough analysis of a small (38 cases) but impressive French study of the impact of adoption on IQ at age 14. Bottom-line looks roughly like:
Nature 60 - Nurture 40
This is a larger role for environment than several American adoption studies have found, but this French effort put a lot of work into getting around the "restriction of range" problem (they seldom let people in the bottom ranks of society adopt children). They found 8 kids who were the biological children of professional class parents but were raised by farmers or laborers.
Heredity seems to have more impact on the most g-loaded parts of IQ.
My published articles are archived at iSteve.com -- Steve Sailer
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