Are there actually significant differences between a girls brain and a boys brain?
Sex differences in the brain begin in the womb. About midway through pregnancy, the testicles of a developing baby boy start churning out testosterone in substantial quantities, achieving serum testosterone concentrations comparable to those seen in young adult men. These sex hormones, transformed by aromatase enzymes within the brain, bind to brain tissue and begin to transform it. Between 18 and 26 weeks gestation, the developing brain is permanently and irreversibly transformed. Israeli scientists Reuwen and Anat Achiron have found that if you do a regular ultrasound examination when a woman is 26 weeks pregnant, you can distinguish a female brain from a male brain. Source: Reuwen Achiron, Shlomo Lipitz, & Anat Achiron. Sex-related differences in the development of the human fetal corpus callosum: in utero ultrasonographic study. Prenatal Diagnosis, 2001, 21:116-120. This in utero study confirmed the findings of a previous anatomical study in which investigators examined the brains
