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Hamer noted, if it were applied to people of different ages to see when in life the different pattern of response developed.ĭr. "The study does not give any answer to these crucial questions."īut the technique might provide an answer, Dr. "We cannot tell if the different pattern is cause or effect," Dr. Savic's finding could be just a consequence of straight and gay men's using their brain in different ways. If sexual orientation has a genetic cause, or is influenced by hormones in the womb or at puberty, then the neurons in the hypothalamus could wire themselves up in a way that permanently shapes which sex a person is attracted to.Īlternatively, Dr. Savic sees in the brains of gay men could be either a cause of their sexual orientation or an effect of it. The different pattern of activity that Dr. Dean Hamer, a geneticist at the National Institutes of Health. "The big question is not where homosexuality comes from, but where does sexuality come from," said Dr. She said the Swedish study was extremely interesting, even though "humans are a terrible experimental subject." She noted, however, that the researchers used a far higher dose of the armpit chemical than anyone would be exposed to in normal life. Catherine Dulac, a Harvard University biologist who studies pheromones in mice, said that if a chemical modified the function of the hypothalamus, that might be enough to regard it as a pheromone. They do," wrote the authors of a commentary in Neuron about Dr. "The question of whether human pheromones exist has been answered. Savic's work as strong evidence in favor of human pheromones. But a role for human pheromones could not be ruled out, especially in light of findings that women living or working together tend to synchronize their menstrual cycles. Researchers interpreted that to mean that humans, as they evolved to rely on sight more than smell, had no need of the primitive cues that pass for sexual attractiveness in mice. Hopes by the fragrance industry, among others, of finding human pheromones were dashed several years ago when it emerged that a tiny structure in the nose through which mice detect many pheromones, the vomeronasal organ, is largely inactive in humans, having lost its nervous connection with the brain. Mice are known to influence each other's sexual behavior through emission of chemicals that act like hormones on the recipient's brain and so are known as pheromones. The new finding, if confirmed, would break ground in two important directions, those of human pheromones and human sexuality. But both findings suggest that the hypothalamus is organized in a way related to sexual orientation. LeVay, which is a mere millimeter or so across. The brain scanning technique used by the Swedish researchers lacks the resolution to see the region studied by Dr. Simon LeVay that a small region of the hypothalamus is twice as large in straight men as in women or gay men. The finding is similar to a report in 1991 by Dr.
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Savic reports, as if the hypothalamus's response is determined not by biological sex but by the owner's sexual orientation. The gay men responded to the two chemicals in the same way as did women, Dr. The Swedish researchers have now repeated the experiment but with the addition of gay men as a third group. The two chemicals seemed to be leading a double life, playing the role of odor with one sex and of pheromone with another. The male sweat chemical, on the other hand, did just the opposite it activated mostly the hypothalamus in women and the smell-related regions in men. This is a region in the central base of the brain that governs sexual behavior and, through its control of the pituitary gland lying just beneath it, the hormonal state of the body.
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The estrogen-like compound, though it activated the usual smell-related regions in women, lighted up the hypothalamus in men. Savic and colleagues showed that the two chemicals activated the brain in a quite different way from ordinary scents. Most odors cause specific smell-related regions of the human brain to light up when visualized by a form of brain imaging that tracks blood flow in the brain and therefore, by inference, sites where neurons are active.