Word: hypothalamuses
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EVEN GETTING OUT OF BED CAN BE TOUGH ON THE BODY. SEVERAL hours before you wake each morning, a tiny region at the base of your cerebrum called the hypothalamus sends a signal that ultimately alerts your adrenal glands, which sit on top of your kidneys, to start pumping out cortisol, which acts as a wake-up signal. Cortisol levels continue to rise after you become conscious in what is sometimes referred to as the "Oh, s___! It's another day" response. This may help explain why so many heart attacks and strokes occur between...
Modern scientists have done a far better job of things, dividing the brain into multiple, discrete regions with satisfyingly technical names--hypothalamus, caudate nucleus, neocortex--and mapping particular functions to particular sites. Here lives abstract thought; here lives creativity; here is emotion; here is speech. But what about here and here and here and here--all the countless places and ways the brain continues to baffle us? Here still be dragons...
...central brain lies the limbic system (hypothalamus, hippocampus, amygdala), where the aggression seems to start. But there is a higher brain as well. If war originates as an impulse of the lower mind, then peace is an accomplishment of the higher, and the ascent from the brain's basement, where the crocodile lives, to the upper chambers may be the most impressive climb that humans attempt. In 1993 the traffic was heavy in both directions, from the world's lower brain to the upper, and back down again. Gestures of statesmanship, as lately in Northern Ireland, alternated with low-brain...
That's exactly what happened last week. Researchers at the Karolinska Institute in Sweden who had earlier shown that hormonelike pheromones stimulate the human hypothalamus--a part of the brain that governs sexual arousal--took the experiment one provocative step further. Writing in the Proceedings of the National Academy of Sciences, they reported that gay men don't respond to the chemicals the same way that straight men do. "It clearly substantiates the idea that there's a biological substrate for sexual orientation," says Dean Hamer, a geneticist at the National Institutes of Health and the author of Science...
Pfaus argues further that estrogen may be the ultimate love hormone for men as well. "A lot of studies on rats and birds," he says, "show that brains are like giant ovaries, in the sense that testosterone and other androgens are converted into estrogens in the hypothalamus. And this conversion appears to be critical to the expression of male sexual behavior...