En nyt sanoisi että että 14-20 % mitä uusimmissa tutkimuksissa on muun kuin genetiikan osuudeksi olisi "todella paljon".
Heritability of IQ - Wikipedia
"in studies of adult individuals have found a heritability of IQ between 57% and 73%
[6] with the most recent studies showing heritability for IQ as high as 80%
[7] and 86%.
[8]. IQ goes from being weakly correlated with genetics, for children, to being strongly correlated with genetics for late teens and adults. The heritability of IQ increases with age and reaches an asymptote at 18–20 years of age and continues at that level well into adulthood. This phenomenon is known as the
Wilson Effect.
[9] Recent studies suggest that family and parenting characteristics are not significant contributors to variation in IQ scores;
[10] however, poor prenatal environment, malnutrition and disease can have deleterious effects."