This is, of course, exactly the kind of result that you would expect to get given the way that heritability is defined. When you make environment more uniform in terms of quality, you drive up the heritability, and vice versa.
The strength of the effect is still interesting, though.
Doesn’t the Turkheimer et al. result suggest that equalizing environments can drive heritability up or down, depending on how one does it? It’s as if the norms of reaction converge with decreasing SES, whereas the usual heritability analysis implicitly assumes parallel norms of reaction.
This is, of course, exactly the kind of result that you would expect to get given the way that heritability is defined. When you make environment more uniform in terms of quality, you drive up the heritability, and vice versa.
The strength of the effect is still interesting, though.
Doesn’t the Turkheimer et al. result suggest that equalizing environments can drive heritability up or down, depending on how one does it? It’s as if the norms of reaction converge with decreasing SES, whereas the usual heritability analysis implicitly assumes parallel norms of reaction.