It seems that scientists and bloggers in the fields of evolutionary psychology, behavioral genetics and anthropology can be divided into three camps: HBD deniers, HBD moderates, and HBD extremists.

HBD deniers: These are people who believe that intelligence and other mental traits did evolve in humans, but it generally took hundreds of thousands of years for significant changes to occur, thus while different species within the genus homo may differ genetically in intelligence and other mental traits, there are no (or few) such significant differences between races. Most scientists are HBD deniers, at least publicly.

HBD moderates: These are people who believe that intelligence and other mental traits did evolve in humans, but it generally took tens of thousands of years for significant changes to occur, thus while different races within the species homo may differ genetically in intelligence and other mental traits, there are no (or few) such significant differences between ethnic groups within races. People like J.P. Rushton, Arthur Jensen, Michael Hart and Richard Lynn are probably mostly in the HBD moderate camp, since they often link population differences in behavior to ancient long lasting forces like exposure to the ice age, and feel it took 50,000 to 110,000 years for the 15-20 point black-white IQ gap to evolve. HBD moderates get attacked by HBD deniers for focusing on racial differences instead of the less controversial ethnic differences, and they get attacked by HBD extremists for ignoring all the recent evolution the extremists assert.

HBD extremists: These are people who believe that intelligence and other mental traits did evolve in humans, and it took only thousands or even hundreds of years for significant changes to occur, thus even very similar ethnic groups within the same race show large genetic differences. An example of this view is the book The 10,000 year explosion which argued that a 10+ point IQ gap between Ashkenazi Jews and the Caucasoid gentiles they split off of, evolved in only 800 years! Most of the HBD blogosphere would fall in the HBD extremist camp, regardless of whether they focus on intelligence, or other behavioral traits.

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