Just wanted to clarify the poster who mentioned Australian Aborigines & their relatively average low IQ levels I am not aware of such research , but based on the United States IQ disparity between 'blacks' & 'whites', its probably correct. What matters is why that is the case. The explanation given in the United States was lower socioeconomic status. That has tended to be shown over time & the IQ gap has narrowed significantly probably as the social disparity & racism has reduced. One key determinant of IQ is nutrition in the developing brain. Lower nutrition levels in infancy have translated to poorer IQ. It would be expected that those on lower incomes would tend to have poorer nutrition. Additionally, those of lower socioeconomic status probably have less cognitively complex interactions & potentially lower self esteem, on average. There is a concept in IQ research known as the Flynn effect - IQs have increased generation on generation, such that we have FAR higher IQs today than 100 years ago. If, for example, Albert Einstein was to sit an IQ test today, he may not even achieve average level IQ, as the tests have increased in complexity since their first iteration. https://en.wikipedia.org/wiki/Flynn_effectAs a result coming back to Australian Aborigines, the reason for the lower average IQ would be due to disadvantage & disparate socioeconomic status. That means, if we took 100 Australian aborigines & 100 Australian caucasians & gave them exactly the same opportunities, nutrition & health, there would be no significant different in their average IQ if it were tested at age 25
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