Frank, you're an incredibly confused individual. The quote is regarding Neuroimaging intelligence testing ONLY (this is NEW cutting edge area of scientific research). This is a separate but related discipline to the other intelligence testing we've been discussing throughout this entire thread - you know the one with a 100 year history of data?Sure, its not PC, but if the science supports there will be papers backing it that don't come from the Pioneer Fund.
So where are they?
Even this paper you posted says you are wrong and that there is little difference between groups.
You're also disingenuous by highlighting one sentence while ignoring the rest, which answers your question as to "where are [the studies]?"
"This has made neuroscientists reluctant to investigate individual or group differences in intelligence, as they may be perceived as racist"
See a common thread here? Scientists are AFRAID to do SCIENCE because they may be deemed racist if the results are not to your PC liking. It's like Galileo all over again. Very bad when researchers feel they cannot conduct studies or the king will have their head.