爱情的科学－你或许也会面对它……

You might as well face it ... / 你或许也会面对它……

Sex stimulates¹ the release of vasopressin and oxytocin in people, as well as voles, though the role of these hormones³ in the human brain is not yet well understood. But while it is unlikely that people have a mental, smell-based map of their partners in the way that voles do, there are strong hints that the hormone² pair have something to reveal about the nature of human love: among those of Man's fellow primates⁴ that have been studied, monogamous marmosets have higher levels of vasopressin bound in the reward centres of their brains than do non-monogamous rhesus macaques.

虽然抗利尿激素和催产素在人脑内的角色仍未被透彻了解，但与田鼠一样，人体在受到性刺激时也会释放这些荷尔蒙。尽管与田鼠不一样，人类不太可能有一张基于嗅觉的神经系统伴侣图谱，但若干线索已有力说明，这两种荷尔蒙能揭示一些人类恋爱的本质∶在已被研究过的人类灵长目同伴之中，一夫一妻制小长尾猴的大脑奖赏中枢系统中，抗利尿激素水平较非一夫一妻制的恒河短尾猿高。

Other approaches are also shedding light on the question. In 2000, Andreas Bartels and Semir Zeki of University College, London, located the areas of the brain activated⁵ by romantic love. They took students who said they were madly in love, put them into a brain scanner, and looked at their patterns of brain activity.

其他方法也正在为人们寻找这些问题的谜底。2000 年，来自伦敦市大学学院的Andreas Bartels和Semir Zeki定位出了能被浪漫爱情激活的大脑区域。两位学者选择自称正在热恋的学生作为测试目标，利用脑扫描仪对他们的大脑活动模式进行观测。

The results were surprising. For a start, a relatively⁶ small area of the human brain is active in love, compared with that involved in, say, ordinary friendship. “It is fascinating to reflect”, the pair conclude, “that the face that launched a thousand ships should have done so through such a limited expanse of cortex.” The second surprise was that the brain areas active in love are different from the areas activated in other emotional states, such as fear and anger. Parts of the brain that are love-bitten include the one responsible for gut⁷ feelings, and the ones which generate the euphoria induced by drugs such as cocaine⁹. So the brains of people deeply in love do not look like those of people experiencing strong emotions, but instead like those of people snorting coke. Love, in other words, uses the neural¹⁰ mechanisms¹¹ that are activated during the process of addiction¹². “We are literally¹³ addicted¹⁴ to love,” Dr Young observes. Like the prairie voles.

令人惊讶的是：首先，人脑参与到恋爱的活动区域，较之其他感情（如普通友谊），相对要比较小些。“引人注意的是，结果显示，”两位学者推断说，“美丽的面容是通过控制一个有限区域的大脑皮层来实现‘一顾倾人城，再顾倾人国’的。”  第二个惊奇之处是，大脑内因恋爱而活跃的区域不同于因其他情绪而活跃的区域，例如，恐惧和愤怒。 被恋爱“咬住”的那部份大脑还包括负责内脏感觉和因可卡因等毒品生成快感的区域。因此，因此，深坠爱河的恋人们的大脑，并非类同于经历强烈情绪波动的人，倒更接近那些鼻吸可卡因的瘾君子。换句话说，爱情使用的是在成瘾过程中被激活的神经机制。“严格地讲, 我们成瘾于爱情，”Young博士评述道，“就如同草原田鼠”。

It seems possible, then, that animals which form strong social bonds do so because of the location of their receptors for vasopressin and oxytocin. Evolution acts on the distribution of these receptors to generate social or non-social versions of a vole. The more receptors located in regions associated with reward, the more rewarding social interactions become. Social groups, and society itself, rely ultimately on these receptors. But for evolution to be able to act, there must be individual variation between mice, and between men. And this has interesting implications.

那么看起来，能形成稳固社会联结的动物之所以愿意建立彼此间的伙伴关系，可能是由它们的抗利尿激素和催产素受体在大脑中的位置所决定。生物进化作用于以上受体在大脑的分布，而产生了社会性或非社会性不同版本的田鼠。位于奖赏机制有关区域的受体越多，对个体而言, 社会互动就更具有回报性。动物的社会性团体，乃至整个社会本身都最终依赖于这些受体。但要使进化真能发生效力，在鼠之鼠之间以及人与人之间，一定存在个体变异。这一论述还有引人入胜的推论。

Last year, Steven Phelps, who works at Emory with Dr Young, found great diversity in the distribution of vasopressin receptors between individual prairie voles. He suggests that this variation contributes to individual differences in social behaviour—in other words, some voles will be more faithful than others. Meanwhile, Dr Young says that he and his colleagues have found a lot of variation in the vasopressin-receptor gene⁸ in humans. “We may be able to do things like look at their gene sequence, look at their promoter sequence, to genotype people and correlate that with their fidelity,” he muses¹⁵.

在Emory大学与Young博士一同工作的Steven Phelps去年发现，草原田鼠各个体间抗利尿激素受体的脑内分布，存在着很大的差异。他提出，正是这一变异导致了社会行为的个体差异，换句话说，一些田鼠将会比另一些更加忠诚。同时，Young博士说他和同事已经发现人类抗利尿激素受体基因的许多变异。“我们或许能够做些类似于察看人们的基因序列，察看他们的启动序列等工作，在此基础上对人们进行基因型分类, 并把分类结果与他们的忠诚度关联起来”，Young博士作如是想。

It has already proved possible to tinker with this genetic¹⁶ inheritance, with startling results. Scientists can increase the expression of the relevant receptors in prairie voles, and thus strengthen the animals' ability to attach to partners. And in 1999, Dr Young led a team that took the prairie-vole receptor gene and inserted it into an ordinary (and therefore promiscuous) mouse. The transgenic mouse thus created was much more sociable¹⁷ to its mate.

事实已经证明可能对这种基因遗传进行修补，并产生了令人吃惊的结果。科学家能增加草原田鼠相关受体的表达，以加强动物对同伴的依附能力。而且在 1999 年，Young博士带领了一只研究队伍，他们将草原田鼠的受体基因插入到一只平常(因此成为杂乱的) 老鼠的体内，由此产生的转基因鼠对它的配偶表现得更为友善。

1 stimulates   

v.刺激( stimulate的第三人称单数 )；激励；使兴奋；起兴奋作用，起刺激作用，起促进作用

参考例句：

• Exercise stimulates the body. 运动促进身体健康。 来自《简明英汉词典》
• Alcohol stimulates the action of the heart. 酒刺激心脏的活动。 来自《现代英汉综合大词典》

2 hormone   

n.荷尔蒙，激素，内分泌

参考例句：

• Hormone implants are used as growth boosters.激素植入物被用作生长辅助剂。
• This hormone interacts closely with other hormones in the body.这种荷尔蒙与体內其他荷尔蒙紧密地相互作用。

3 hormones   

n. 荷尔蒙，激素 名词hormone的复数形式

参考例句：

• This hormone interacts closely with other hormones in the body. 这种荷尔蒙与体內其他荷尔蒙紧密地相互作用。
• The adrenals produce a large per cent of a man's sex hormones. 肾上腺分泌人体的大部分性激素。

4 primates   

primate的复数

参考例句：

• Primates are alert, inquisitive animals. 灵长目动物是机灵、好奇的动物。
• Consciousness or cerebration has been said to have emerged in the evolution of higher primates. 据说意识或思考在较高级灵长类的进化中已出现。

5 activated   

adj. 激活的 动词activate的过去式和过去分词

参考例句：

• The canister is filled with activated charcoal.蒸气回收罐中充满了活性炭。

6 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。

7 gut   

n.[pl.]胆量；内脏；adj.本能的；vt.取出内脏

参考例句：

• It is not always necessary to gut the fish prior to freezing.冷冻鱼之前并不总是需要先把内脏掏空。
• My immediate gut feeling was to refuse.我本能的直接反应是拒绝。

8 gene   

n.遗传因子，基因

参考例句：

• A single gene may have many effects.单一基因可能具有很多种效应。
• The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。

9 cocaine   

n.可卡因，古柯碱（用作局部麻醉剂）

参考例句：

• That young man is a cocaine addict.那个年轻人吸食可卡因成瘾。
• Don't have cocaine abusively.不可滥服古柯碱。

10 neural   

adj.神经的，神经系统的

参考例句：

• The neural network can preferably solve the non- linear problem.利用神经网络建模可以较好地解决非线性问题。
• The information transmission in neural system depends on neurotransmitters.信息传递的神经途径有赖于神经递质。

11 mechanisms   

n.机械( mechanism的名词复数 )；机械装置；[生物学] 机制；机械作用

参考例句：

• The research will provide direct insight into molecular mechanisms. 这项研究将使人能够直接地了解分子的机理。 来自《简明英汉词典》
• He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》

12 addiction   

n.上瘾入迷，嗜好

参考例句：

• He stole money from his parents to feed his addiction.他从父母那儿偷钱以满足自己的嗜好。
• Areas of drug dealing are hellholes of addiction,poverty and murder.贩卖毒品的地区往往是吸毒上瘾、贫困和发生谋杀的地方。

13 literally   

adv.照字面意义，逐字地；确实

参考例句：

• He translated the passage literally.他逐字逐句地翻译这段文字。
• Sometimes she would not sit down till she was literally faint.有时候，她不走到真正要昏厥了，决不肯坐下来。

14 addicted   

adj.沉溺于....的，对...上瘾的

参考例句：

• He was addicted to heroin at the age of 17.他17岁的时候对海洛因上了瘾。
• She's become addicted to love stories.她迷上了爱情小说。

15 muses   

v.沉思，冥想( muse的第三人称单数 )；沉思自语说（某事）

参考例句：

• We have listened too long to the courtly muses of Europe. 欧洲那种御用的诗才，我们已经听够了。 来自辞典例句
• Shiki muses that this is, at least, probably the right atmosphere. 志贵觉得这至少是正确的气氛。 来自互联网

16 genetic   

adj.遗传的，遗传学的

参考例句：

• It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
• Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

17 sociable   

adj.好交际的，友好的，合群的

参考例句：

• Roger is a very sociable person.罗杰是个非常好交际的人。
• Some children have more sociable personalities than others.有些孩子比其他孩子更善于交际。