Race, Evolution, and Behavior: A Life History Perspective
Rushton's thesis is that when fully modern humans migrated out of Africa, perhaps only 100,000 years ago, the colder Eurasian climate selected for larger brains, more forward planning, greater family stability, and increased longevity with concomitant reductions in sex hormone, speed of maturation, reproductive potency, and aggressiveness. Rushton's theory emphasizes a trade-off between parenting and mating and brings into focus the concept of a coordinated life history of characteristics, evolving together, to replicate genes more effectively. The selection for large brains and parenting skills was taken furthest in east Asia. Rushton's theory explains differentiation in intelligence and predicts other, seemingly unrelated race effects, such as differences in frequency of twinning. The capacity to unify disparate phenomena is usually considered a virtue in theories.
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Revamping Social Science
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ability adopted adults African aggregated altruism American animals average behavior biological birth body brain Caucasoids cited compared correlation countries cranial capacity crime cultural differences early effects environment environmental estimates European evidence evolution evolutionary examined example factors female Figure genes genetic greater groups head heritability higher Homo human increased individual influence intelligence Intermediate Jensen larger later less lower Lynn males maturation mean measures mental Mongoloids months nature Negroids Note occurred offspring organization Orientals origin pairs parents pattern percent personality populations predicted produce Psychological race racial racial differences range relative reported reproductive Rushton sample scale scores selection sexual shown siblings similar single social species studies suggested Table tests theory tion traits twins United University variables weight women