Way back in the 1980s, Rushton had a hunch that evolution is progress and some populations are more advanced than others, with newer forms of life being more developed than than those that emerged early.
One characteristic of Mongoloid populations is a spatial ability is more developed than verbal ability. We even see this in incipient Mongoloid groups like Native Americans despite them having a totally different culture from Northeast Asians and being separated from them for 30,000 years. Richard Lynn argued that the spatial demands of surviving ice age Northern Siberia were so extreme that the left hemisphere of the Mongoloid brain (the seat of language) was invaded and forced to take on more spatial processing. And yet full Mongoloids, like tonight’s Jeopardy! champ, often have so much overall intelligence than even verbal IQ is sky high.