Structure of a gay brain

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The God Helmet. Psychic Technology. Deja Vu.

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The brains of gay men resemble those of straight women, according to research published today that provides more evidence of the role of biology in sexual orientation. Using brain-scanning equipment, researchers said they discovered similarities in the brain circuits that deal with language, perhaps explaining why homosexual men tend to outperform straight men on verbal skills tests -- as do heterosexual women. The area of the brain that processes emotions also looked much the same in gay men and straight women -- and both groups have higher rates of depressive disorders than heterosexual men, researchers said.

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British Broadcasting Corporation Home. The brains of gay men and women look like those found in heterosexual people of the opposite sex, research suggests. The Swedish study, published in the Proceedings of the National Academy of Sciences journal, compared the size of the brain's halves in 90 adults.

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From an evolutionary point of view, homosexuality is rather difficult to explain. Any genetic trait that reduces the chances of producing the offspring usually gets eliminated very quickly in populations. Nonetheless, homosexuality appears to persist in humans throughout the history of our species.

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Recent brain research has revealed structural differences in the hypothalamus in relation to biological sex and sexual orientation. Differences in size and cell number of various nuclei in the hypothalamus for homosexual versus heterosexual men have recently been reported in two studies. We have found that a cluster of cells in the preoptic area of the human hypothalamus contains about twice as many cells in young adult men as in women.

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The relationship between biology and sexual orientation is a subject of research. While scientists do not know what determines an individual's sexual orientationthey theorize that it is caused by a complex interplay of genetichormonaland environmental influences. Biological theories for explaining the causes of sexual orientation are favored by scientists.

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By Marcia Malory Ask this question, and you will probably receive one of two responses:. People choose to be gay. They are making an immoral choice, which government should discourage.

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Swedish researchers did MRI scans of 50 heterosexual men and women and 40 homosexual men and women and found surprising parallels. The brains of lesbians and straight men were anatomically symmetrical while the brains of gay men and straight women had a larger right brain hemisphere. Meanwhile, the amygdala of lesbians and straight men had more connections to the region that controls fight or flight reactions. These clear differences suggest that sexual orientation is determined by biology, not by social factors.

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Swedish researchers have found that some physical attributes of the homosexual brain resemble those found in the opposite sex, according to an article published online June 16 in the Proceedings of the National Academy of Sciences. Other research has hinted that homosexuals may exhibit the tendencies of the opposite sex in brain behavior unrelated to sexual activity. Positron emission tomography PET scans taken by the researchers also show that in connectivity of the amygdala which is important for emotional learninglesbians resemble straight men, and gay men resemble straight women.

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Brain scans have provided the most compelling evidence yet that being gay or straight is a biologically fixed trait. The scans reveal that in gay people, key structures of the brain governing emotion, mood, anxiety and aggressiveness resemble those in straight people of the opposite sex. The differences are likely to have been forged in the womb or in early infancy, says Ivanka Savic, who conducted the study at the Karolinska Institute in Stockholm, Sweden. First they used MRI scans to find out the overall volume and shapes of brains in a group of 90 volunteers consisting of 25 heterosexuals and 20 homosexuals of each gender.

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