The nutrition of the mother as well as exposure to certain chemicals during the pregnancy plus actions/drugs used during the birth can play as large if not greater part in the IQ of a child as genetics.
Interesting. Identical twins raised separately have a correlation of .76, while fraternal twins raised together have a correlation of just .55 and non-twin siblings raised together have a correlation of .47[0]. To me that suggests a strong genetic (though not necessarily heritable) component. And perhaps the .08 difference between fraternal twins and non-twin siblings is explained by differences in the mother's nutrition.
How do you measure the effect of nutrition? What studies are you looking at?
Comments
The nutrition of the mother as well as exposure to certain chemicals during the pregnancy plus actions/drugs used during the birth can play as large if not greater part in the IQ of a child as genetics.
Interesting. Identical twins raised separately have a correlation of .76, while fraternal twins raised together have a correlation of just .55 and non-twin siblings raised together have a correlation of .47[0]. To me that suggests a strong genetic (though not necessarily heritable) component. And perhaps the .08 difference between fraternal twins and non-twin siblings is explained by differences in the mother's nutrition.
How do you measure the effect of nutrition? What studies are you looking at?
[0]: http://en.wikipedia.org/wiki/Heritability_of_IQ#Correlations...
Here you go :
http://www.ncbi.nlm.nih.gov/pubmed/20937654