September 19, 2014

SEPARATED BEFORE BIRTH:

Yes, it's official, men are from Mars and women from Venus, and here's the science to prove it (Lewis Wolpert, 14 Sep 2014, The Telegraph)

The first big surprise happens before birth. All men in the world today are essentially biologically modified women, because we all start our embryonic lives as females (that is why, for example, men still have breasts, even though they serve no function). The biological differences that can be found between the bodies and brains of males and females are largely due to the way these embryos develop in the womb.

We all come from a single cell, the egg, from the female. The early development of the human embryo is similar in males and females, and is essentially female, with male features appearing only at later stages. Whether we develop as a female or male depends on whether the sperm brings in an X or Y chromosome. The genes on the Y chromosome cause testes to develop, which secrete the hormone testosterone and suppress female development.

There are also fundamental differences in brain development between men and women, which are clear from the early behaviour of children. A few hours after birth, girls are more sensitive than boys to touch, and 40 hours after birth girls look longer at a face than boys, while boys look longer at a suspended mechanical mobile. At four months old, if babies are frightened in a strange room, twice as many girls as boys cry. Children's play provides further evidence for genetic differences. At 12, 18 or 24 months, girls look at dolls much more than boys, while boys look at cars much more than girls. It is hard to attribute these basic differences at such young ages to purely social influences.

The development of the brain leads to many other differences and it has been claimed that clear sex differences exist in every brain lobe. There are some visible structural differences, such as a cluster of cells in the hypothalamus that is believed to relate to sexual behaviour and which is twice as big in men as in women.

Posted by at September 19, 2014 5:43 PM
  

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