Judith Kearins' 'Visual and Spatial Memory in Aboriginal and White Australian Children' is a fascinating study which demonstrates that, although performing very badly in IQ tests for whites, Aboriginal children have a remarkable talent for recall of large numbers of objects and their position in a 'Kim's Game' type of exercise. The study tried to decide whether this was an innate (ie genetic) or learned skill, but (and here is the part pertinent to this thread) she found this almost impossible to ascertain. Their parents encouraged these traits, even when living as white people and not 'in the Bush'. I think the Nature/Nurture factor will always cloud any so-called IQ testing.