What is it that men and women behave differently? Vetandets World December 28 will not reflect the political debate, but to call the research results suggest that there may be some innate biological differences between men and women which have an impact on behavior.

Boys' brains are exposed to the influence of testosterone, the male sex hormone, early in fetal life and then also during the neonatal period. It is their own testicles which produce this testosterone. The testicles resting since until puberty.

For some different reasons, even a female fetuses exposed to relatively high levels of male hormones, so there is a clear distinction between how girls and boys are affected hormonally in the womb.

The Brain

In the brain have been found average anatomical differences between women and men in a few different places, and the researchers believe that hormonal influences during fetal and postnatal periods is important for this. An example is the size of some nuclei in the part of the brain called the hypothalamus. These cores are believed to be important for partner preference and if you should experience themselves as male or female. Another difference is the thickness of the connecting links that exist between the two hemispheres. Women nerve bundles between the hemispheres of the brain tend to be thicker than men.

Some researchers argue that the differences between men's and women's brains in terms of neurotransmitters and hormones is more important than the anatomical differences.

The approach of testosteron

One way to approach the question whether there are innate behavioral differences between men and women are studying newborns with testosteron. A study by the likes of the British researcher Simon Baron-Cohen shows that newborn girls are more interested in looking at a face than boys are. And newborn boys are more interested in looking at a mechanical mobile. This is mostly because of testosteron in the body.

The studie from Swedish Testosterontillskott.se

The program from testosterontillskott.se interviewed Annica Dahlstrom, Professor of Histology and Neurobiology, Elias Eriksson, professor of pharmacology, and Stefan Hansen, Professor of Biological Psychology, all at the University of Gothenburg.