功能性核磁共振首次揭示女性性高潮之谜.doc

功能性核磁共振首次揭示女性性高潮之谜
发表者：黄新飞 (访问人次：2422)
功能性核磁共振首次揭示女性性高潮之谜（转）
据英国《星期日泰晤士报》报道说，科学家们通过扫描女性性高潮时的脑部变化照片发现，女性性高潮过程涉及逾30个不同脑区，而且在达到高潮的每一阶段，脑部活动都会不同程度增加，不但影响脑内的回馈线路，负责理性思维的脑区也会受影响。女性的性高潮要比男性更加持久更加深入，这给神经系统带来了巨大的负荷，这种过度负荷同样也会使女性的痛楚感觉暂时纾减。江苏省中医院男科黄新飞
美国新泽西州罗格斯大学脑神经科的Barry Komisaruk教授及其研究小组利用计算机扫描，首次拍摄到女性在进入和达到性高潮时的脑部活动情况。研究中，8名女性躺进功能核磁共振成像扫描仪(fMRI)内，盖上毛毯自慰，仪器每隔两秒就拍下一张脑扫描照。大部分人能在5分钟内达到高潮，一些人则需时20分钟。
参加者以举手示意达到高潮，结果发现，部分女性在一个时间段内多次举手，而且仅相隔数秒，反映女性性高潮时间较长，而且会连续经历多次。女性性高潮大多维持10至15秒，而男性性高潮大概只能持续6秒钟左右。 研究人员下一步计划对男性进行同类的脑部扫描，以研究女性性高潮是否比男性更持久和更深入。

女性受试者躺进功能核磁共振成像扫描仪(fMRI)内，以手示意达到性高潮

Barry Komisaruk教授在仪器前记录脑部扫描影像

性兴奋开始至高潮过程中脑部功能活性变化
                                                                                                             （来源： 环球网 ）
众所周知，人类的性功能几乎都或多或少与大脑的神经系统有关，男人在情绪低落的时候，性欲也低下，勃起、射精功能也下降；反之，女性亦然。美国神经科专家丹尼尔•阿门曾经说过：性和爱都源于大脑。在他看来，大脑就是“性爱的总司令”：我们感受到性爱激情，是因为大脑中特定的神经化学体系，让我们产生了这些情感。大脑中的爱情和性念头是如何产生的？又如何在我们脑中“徘徊”的呢？近几年，有关性功能在大脑中的功能定位研究方兴未艾，很多学者开始密切关注这一神秘的研究领域。但由于缺乏有效直观的研究手段，进展尤为缓慢。随着功能核磁共振成像技术（fMRI）的出现，为这一领域的研究打开了方便之门，通过该项技术，我们可以实时观察人类性活动中大脑功能区域的活动变化，从而了解性反应在大脑中的准确定位，换句话说，就是让我们能够分辨出大脑中哪些区域控制高潮，哪些区域控制勃起，哪些区域控制射精。。。
研究这些东西意义何在呢？意义在于，只要我们了解了性功能在大脑中的准确定位，我们就可以对这些功能区域进行细致的研究，寻找大脑控制性活动的内在机理，然后选择合适的调节手段，来调节大脑对性功能的控制，并最终用于性功能障碍的治疗。

男性大脑的大体功能定位

女性大脑的大体功能定位

【原文】What women think during an orgasm
 Sneak-a-peek inside a woman's brain while she is having orgasm would now be possible, thanks to a scan developed by American scientists.
Rutgers University researchers have discovered that sexual arousal numbs the female nervous system to such an extent that she doesn't feel as much pain-only pleasure.
Orgasm affects up to 30 different parts of the brain including those responsible for emotion, touch, joy, satisfaction and memory, found researchers.
The researchers asked eight women to stimulate themselves while lying under a blanket inside a Magnetic Resonance Imaging (MRI) scanner, a tunnel-like machine often used to detect brain tumours.
Most women took less than five minutes to reach an orgasm although some took as long as 20.
During that time, the MRI scanner took images of their brain every two seconds to show which parts became active during the orgasm.
The scientists found that two minutes before the orgasm, the brain's reward centres become active, the areas usually activated when eating food and drink.
Immediately before they reached the peak, other areas of the brain became affected such as the sensory cortex, which receives ''touch'' messages from parts of the body and the thalamus, which relays signals to other parts of the body.
Once the orgasm has started other parts of the brain are activated such as those responsible for emotion.
The final part of the brain to be activated is the hypothalamus, the ''control'' part of the brain, which regulates temperature, hunger, thirst and tiredness.
At the same time another area responsible for pleasure is activated - the nucleus accumbens - as well as the caudate nucleus, which is responsible for memory.
"In women, orgasm produces a very extensive response across the brain and body," the Daily Mail quoted Barry Komisaruk of Rutgers University as saying.
"Some women raised their hands several times each session, often just a few seconds apart.
So the evidence is that women tend to have longer orgasms and can experience several in rapid succession," said Komisaruk.
A woman's orgasm last an average of 10-15 seconds, whilst a man's is thought to last for just six seconds.

【参考文献】
Secrets of the Female Orgasm
Rutgers lab studies female orgasm through brain imaging
Female orgasm 'overwhelms'
Revealed: What goes on in a woman's brain when she has an orgasm
What women think during an orgasm