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对于女性,性像是一种强的关闭。扫描研究已经揭示了脑的很多区域，包括那些情绪相关的区域在高潮中关闭。
荷兰葛尔尼根大学的Gert Holstege说：“高潮时分，女性没有任何的情绪的感觉。”他的研究组召集了13对健康异性恋女性和她们的伴侣。这些女性被要求平躺，头放在PET扫描仪中，研究小组会比较她们四个阶段的脑活性：休息，假高潮，伴侣刺激阴蒂，阴蒂刺激到达高潮。
当女性被刺激时，脑的一个感官部分活性升高，但是扁桃体和海马区活性下降，这些区域与警戒和忧虑有关。Holstege在本周在哥本哈根举行的一次欧洲人类生殖和胚胎协会的会议上说，在高潮时，脑许多区域的活性降低。在女性高潮时，脑只有在小脑的一个区域表现出更高的活性，而小脑通常与协调运动相关。
这个发现好像证实了我们已经知道的：女性只有在放松，没有忧虑和分心的情况下才可以享受性。看一看进化上的观点，大脑关闭情绪区域可能是因为在这种时刻物种生殖和生存变得比个体的生存更加重要。
研究小组已经在11位男性身上作了相同的试验，但是高潮中的抑制作用要远远低于女性中测试中得到的结果。无论如何，Holstege说，结果可能不可靠，因为PET扫描仪测量活性大于2分钟――而男性测试中总共才几秒钟。
Women's orgasms are a turn-off for the brain
25 June 2005
NewScientist.com news service
Michael Le Page
FOR women, it seems, sex is a big turn-off. A scanning study has revealed that many areas of the brain switch off during orgasm - including those involved in emotion.
"At the moment of orgasm, women do not have any emotional feelings," says Gert Holstege of the University of Groningen in the Netherlands. His team recruited 13 healthy heterosexual women and their partners. The women were asked to lie with their heads in a PET scanner while the team compared their brain activity in four states: resting, faking an orgasm, having their clitoris stimulated by their partner, and clitoral stimulation to the point of orgasm.
As the women were stimulated, activity rose in one sensory part of the brain but fell in the amygdala and hippocampus, areas involved in alertness and anxiety. During orgasm, activity decreased in many more areas of the brain, Holstege told a meeting of the European Society for Human Reproduction and Embryology in Copenhagen this week. Only one part of the brain, in the cerebellum, was more active in women during orgasm. The cerebellum is generally associated with coordinating movement.
The findings appear to confirm what we already know: that women cannot enjoy sex unless they are relaxed and free from worries and distractions. Looked at from an evolutionary point of view, it could be that the brain switches off the emotions during sex because at such times reproduction and survival of the species become more important than survival of the individual.
The team has already done a similar study with 11 men, which revealed far less deactivation during orgasm than in women. However, Holstege says the results are probably unreliable because PET scanners measure activity over 2 minutes - and in men it's all over in a few seconds.
From issue 2505 of New Scientist magazine, 25 June 2005, page 14
| 最初发表时间：2005-12-30 |  | 黄沙百战穿金甲 不破楼兰终不还
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