For example reaction times... but lets not go there lest someones panties get in a twist.
Oh no! We really should go there!
If you are going to pick up on reaction times as a racial marker of IQ, how do you explain the results of an experiment recently reported in New Scientist?
They studied a group of Atheists in relation to a group of 'religious types' (sorry, I forget the exact religious denomination that was concerned).
The research, to be a reliable, respectable scientific endevour, set controls for age, race, gender etc. The participants were asked to identify a number of small random shapes that were contained within a larger random shape, and the time it took them to complete this task was monitored.
It was found that the 'religious types' (possibly Lutherians?) were quicker in identifying the shapes - a fact the researchers attributed to their constant need to distinguish between and evaluate the influences of church, state and wider society on their lives (though I prefer a fellow readers arguments that atheists took longer because they are more used to critically evaluating anything put before them).
Any way... These result show that such things as 'reaction times' can be affected by culture and upbringing. If such a relatively small cultural difference between the two groups could result in quantifiable differences, then the effects of larger differences are sure to be maginified and ultimately misleading to those who are unable to break out of their small-world, ethnocentric vistas.