https://onlinelibrary.wiley.com/doi/abs/10.1002/dev.22087
Here homozygotes for the non-A- trait candidate gene had higher executive function but only in Japanese young children and not in American young children.
This could be a random occurrence, but if replicated, there may be a sort of culture prejudice against A- trait in Japanese culture? This could translate to a culture prejudice against introspection in Japanese culture??