Sex differences start early, according to a report in Nature Science Update, 21 October 2003. Gender differences in the brain are thought to occur due to testosterone from the developing testes stimulating the brains of unborn males to develop into a male pattern. A team of scientists at the University of California analysed 12,000 brain genes in developing mice and found that the activity of 51 genes is different in males and females before the testes are formed.

Editorial Comment: Although this study was with mice and not men, humans have a mammal physiology, like mice, where gender is genetically determined from conception. Human brains probably have similar gender differences present in early brain development. This would be consistent with Genesis 1 and 2 which clearly state that the first two human beings were deliberately and separately made as male and female. (Ref. gender, brain, development)



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