For those interested in studies of identical twins reared apart, see IQ Similarity of Twins Reared Apart: findings and responses to critics, Bouchard (1997). A question sometimes raised by critics concerns the extent to which twins reared apart actually experienced different environments. Norms of reaction, GxE interactions, and other (conceptually trivial but potentially obfuscatory) topics are also discussed.
Susan Farber wrote a 1981 book that was critical of twin studies. Click below for larger image.
See also Heritability 2.0.
