National Geographic, on June 16, 2008, published the article "Gay Men, Straight Women Have Similar Brains," by James Owen, which stated:
"Differences both in the brain activity and anatomy were observed in a study [by Dr. Ivanka Savic-Berglund] involving 90 men and women, including homosexuals and heterosexuals of both genders.
The researchers monitored neural activity in the brain by charting blood flow.
The scans were carried out when the volunteers were resting and exposed to no external stimuli.
Researchers focused in particular on the amygdala, an almond-shaped structure inside each brain hemisphere associated with processing and storing emotions.
In homosexuals, brain activity most closely matched that of heterosexuals of the other sex.
For example, the study found that straight men and gay women are both wired for a greater 'fight or flight' response than gay men or straight women, the team reports this week in the journal Proceedings of the National Academy of Sciences.
Also, homosexual men and straight women showed significantly more neural connections across the two brain hemispheres than heterosexual men did."
June 16, 2008 National Geographic
Ivanka Savic-Berglund, MD, PhD, Associate Professor and Senior Consultant Neurologist at Karolinska Institutet's Centre of Gender Related Medicine in Stockholm, Sweden, published an article with Per Lindstrom on June 16, 2008, in Proceedings of the National Academy of Sciences:
"Cerebral responses to putative pheromones and objects of sexual attraction were recently found to differ between homo- and heterosexual subjects. Although this observation may merely mirror perceptional differences, it raises the intriguing question as to whether certain sexually dimorphic features in the brain may differ between individuals of the same sex but different sexual orientation...
HeM [heterosexual men] and HoW [homosexual women] showed a rightward cerebral asymmetry, whereas volumes of the cerebral hemispheres were symmetrical in HoM [homosexual men] and HeW [heterosexual women]. No cerebellar asymmetries were found. Homosexual subjects also showed sex-atypical amygdala connections. In HoM, as in HeW, the connections were more widespread from the left amygdala; in HoW and HeM, on the other hand, from the right amygdala...
The present study shows sex-atypical cerebral asymmetry and functional connections in homosexual subjects. The results cannot be primarily ascribed to learned effects, and they suggest a linkage to neurobiological entities."
June 16, 2008 Ivanka Savic-Berglund
Dean Hamer, PhD, Chief of Section on Gene Structure and Regulation at the Laboratory of Biochemistry, National Cancer Institute, was quoted in the article "Study Says Brains of Gay Men and Women Are Similar" by Nikhil Swaminathan and published on June 16, 2008 in Scientific American, stating:
"This is yet another in a long series of observations showing there's a biological reason for sexual orientation. It's not just a reflection of people's behavior, nor is it a choice, nor is it something in their rearing environment. [The study] shows that it's something that people are born with."
June 16, 2008 Dean Hamer
Qazi Rahman, PhD, Lecturer in Psychobiology at the University of East London, was quoted in the article "Gay Brain Structure Similar to Straight Opposite Sex," by Elizabeth Lopatto and published on June 16, 2008 on Bloomberg.com, stating:
"It's likely that these differences are not influenced by learning or socialization. We've known for some time that homosexuals of both sexes may show differences in certain abilities, which are known to reside on one or the other of two sides of the brain."
June 16, 2008 Qazi Rahman