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The researchers used MRIs to determine the volume and shapes of the brains of 90 volunteers-25 straight and 20 gay members of each sex. To get around this, Savic-Berglund focused on the structure and function of brain regions that develop during fetal development or early infancy-without using any cognitive tasks or rating systems. The problem was that there was no way to determine whether their responses were colored by learned social cues. Previous studies have examined brain differences between gay and straight people on the basis of their responses to various tasks, such as rating the attractiveness of other people. shows that it's something that people are born with." "It's not just a reflection of people's behavior, nor is it a choice, nor is it something in their rearing environment.
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"This is yet another in a long series of observations showing there's a biological reason for sexual orientation," says Dean Hamer, a molecular biologist at the National Institutes of Health (NIH), who was not involved in the study. Study author, neurologist Ivanka Savic–Berglund, says such characteristics would develop in the womb or in early infancy, meaning that psychological or environmental factors played little or no role. The same is true for heterosexual men and lesbians. Scientists at the Stockholm Brain Institute in Sweden report in the Proceedings of the National Academy of Sciences USA that gay men and straight women share similar traits-most notably in the size of their brains and the activity of the amygdala-an area of the brain tied to emotion, anxiety and aggression. Researchers using brain scans have found new evidence that biology-and not environment-is at the core of sexual orientation.