So where's the evidence to support the claim that a bias in the test itself is the reason for the discrepancies in the test results? Assertion without evidence is what said nutter professor was doing and he got laughed off the stage (and rightly so). any person conducting a scientific study would have taken steps to try and counter the effects of any cultural bias in the IQ tests used, if they didn't they'd get jumped on and discredited before they'd even published...
got to get to work now, when i get home i'll prepare a better argument