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Right now, we need to identify the genetic causation for these differences in infant behavior.
We’ve seen this with Chinese-American and Euro-American babies, the latter having a less easy temperament.
It may be that the Navaho differ from other North American native peoples in this respect.
Perhaps, in the past, mortality was higher among those babies who resisted the cradleboard; over time, they and their temperament would have been steadily removed from the gene pool.
Although it is doubtful that parental interaction can explain differences in newborn behavior, this assumption seems to make people dismissive of Freedman’s work.– Since the 1970s, and throughout the Western world, academia has become more hostile to the possibility of genetic influences on human behavior.
This trend is self-reinforcing, since hiring decisions are biased toward candidates who believe in environmental determinism.