Researchers Christiane Capron and Michel Duyme compared IQ scores of adopted children raised by parents with high socio-economic status (SES) and parents with low SES, and found that the children raised by parents with high SES had higher IQ scores and the children raised by parents with low SES had lower IQ scores. In addition, children of biological parents with high SES scored higher than children of biological parents with low SES.
The abstract is available for free, but the full study may incur a fee.
http://www.adsabs.harvard.edu/abs/1989Natur.340..552C
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