The Literature of Possibility by Butler-Bowdon Tom

Author:Butler-Bowdon, Tom
Language: eng
Format: epub
Publisher: Nicholas Brealey Publishing
Published: 2013-03-14T16:00:00+00:00

Sexed in the womb

Children are not born a blank slate, comment Moir and Jessel, ready to be conditioned. At six or seven weeks in the womb a baby literally “makes up its mind” with the help of hormones, and is configured into a male or a female patterned brain. Sex differences in the brain originate with the chromosomes (generally “xx” for female, “xy” for male), but the foetus will only become a boy if male hormones are present; if they are absent it will become a female.

It is the concentration, timing, and appropriateness of hormonal action on a fetus that organize the neural network into its definite male or female pattern—and these patterns are very resistant to change after birth. Moir and Jessel note that mammal brains generally are “dimorphic”; that is, they are either male patterned or female patterned. As mammals, therefore, it would have been a freak of nature if the human brain had defied this neural sex patterning.

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