Tuesday, June 17, 2008

Gender differences and sexual orientation in the brain

From the Beeb and several other sources comes an article about which I already kind of knew the answer:

Homosexual brains are similar to heterosexual brains of the opposite sex.

The survey was different, though, in that it measured hemisphere volume. Lesbians and heterosexual men had asymmetric hemispheres, while gay men and heterosexual women had symmetric hemispheres.

What this says about people who are bisexual or pansexual or who are transgender or who are intersex, I don't know. Nature, however, is not quite as cut-and-dry as to make a clear-cut dichotomy for sexual orientation and sex, even though individuals on neither end of the dichotomy don't appear often, so this study has some flaws, but that's another post.

Most studies I've seen about this have been mostly about hormones, in which lesbian women have elevated levels of testosterone and gay men have elevated levels of estrogen or where lesbian women have more or less activation in a certain area of their brain or where gay men have more or less activation in a certain area of their brain than heterosexual people of their sex. What we do know is that sexual orientation is biological.

There are also differences in symmetry of synaptic junctions in the amygdala.

What I'd like to see is a study on people who fit neither end of one or both of the continua to see how similar a brain in, say, a bisexual or pansexual person is to heterosexual or homosexual people.

Sphere: Related Content

6 comments:

Free Software Update said...

Thanks..
Nice Post

Anonymous said...

Thanks! Really great post!
I like the way you write your articles.

If you want you can visit my site:
http://www.wantsomebucks.com

..maybe you win 100$ for free and than you can write on your next article about the site that gave you 100$ for free without doing anything. :)

Have a nice day & keep up your work!

Catatan Blogger Seo Matre Ajib said...

Its a great post,thank 4 your info... i aggre with your opinion

singgih said...

thanks for share..
I like the way you write your articles.
Weight Loss |Tips Diet |Health For Life|Stop Smoking|No Junk Food|Tips For Health|Start Making Money |Get Money with Easy|Software PC|Garden For Designs|Download Software PC|Forex Trading Secrets

clark said...

Hi..that's very usefull post,thanks a lot brother.. i'ts great to join here Catatan Blogger Seo Matre Ajib Techno blog Fashion style and beauty center Best Patio Furniture Travelling tips and idea MP3 download and Song lyrics thanks

Ethan Smith said...
This comment has been removed by the author.