人类眼泪包含某些化学信息
文章来源:未知 文章作者:enread 发布时间:2011-01-09 03:20 字体: [ ]  进入论坛
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Emotional crying is a universal, uniquely human behavior. When we cry, we clearly send all sorts of emotional signals. In a paper published online today in Science Express, scientists at the Weizmann Institute have demonstrated that some of these signals are chemically encoded in the tears themselves. Specifically, they found that merely sniffing1(嗅探) a woman's tears – even when the crying woman is not present -- reduces sexual arousal in men. Humans, like most animals, expel various compounds in body fluids that give off subtle(微妙的,精细的) messages to other members of the species. A number of studies in recent years, for instance, have found that substances in human sweat can carry a surprising range of emotional and other signals to those who smell them.

But tears are odorless(没有气味的) . In fact, in a first experiment led by Shani Gelstein, Yaara Yeshurun and their colleagues in the lab of Prof. Noam Sobel in the Weizmann Institute's Neurobiology Department, the researchers first obtained emotional tears from female volunteers watching sad movies in a secluded2(隐蔽的) room and then tested whether men could discriminate3 the smell of these tears from that of saline(盐湖) . The men could not.

In a second experiment, male volunteers sniffed4 either tears or a control saline solution, and then had these applied5 under their nostrils6(鼻孔) on a pad while they made various judgments7 regarding images of women's faces on a computer screen. The next day, the test was repeated -- the men who were previously8 exposed to tears getting saline and vice9 versa(反之亦然) . The tests were double blinded, meaning neither the men nor the researchers performing the trials knew what was on the pads. The researchers found that sniffing tears did not influence the men's estimates of sadness or empathy expressed in the faces. To their surprise, however, sniffing tears negatively affected10 the sex appeal attributed to the faces.

To further explore the finding, male volunteers watched emotional movies after similarly sniffing tears or saline. Throughout the movies, participants were asked to provide self-ratings of mood as they were being monitored for such physiological11 measures of arousal as skin temperature, heart rate, etc. Self-ratings showed that the subjects' emotional responses to sad movies were no more negative when exposed to women's tears, and the men "smelling" tears showed no more empathy(共感,神入) . They did, however, rate their sexual arousal a bit lower. The physiological measures, however, told a clearer story. These revealed a pronounced tear-induced drop in physiological measures of arousal, including a significant dip in testosterone(睾酮) – a hormone12 related to sexual arousal.

Finally, in a fourth trial, Sobel and his team repeated the previous experiment within an fMRI machine that allowed them to measure brain activity. The scans revealed a significant reduction in activity levels in brain areas associated with sexual arousal after the subjects had sniffed tears.

Sobel: "This study raises many interesting questions. What is the chemical involved? Do different kinds of emotional situations send different tear-encoded signals? Are women's tears different from, say, men's tears? Children's tears? This study reinforces the idea that human chemical signals – even ones we're not conscious of – affect the behavior of others."

Human emotional crying was especially puzzling to Charles Darwin, who identified functional13 antecedents to(在……之前) most emotional displays -- for example, the tightening14 of the mouth in disgust, which he thought originated as a response to tasting spoiled food. But the original purpose of emotional tears eluded15 him. The current study has offered an answer to this riddle16: Tears may serve as a chemosignal. Sobel points out that some rodent17 tears are known to contain such chemical signals. "The uniquely human behavior of emotional tearing may not be so uniquely human after all," he says.



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1 sniffing 50b6416c50a7d3793e6172a8514a0576     
n.探查法v.以鼻吸气,嗅,闻( sniff的现在分词 );抽鼻子(尤指哭泣、患感冒等时出声地用鼻子吸气);抱怨,不以为然地说
参考例句:
  • We all had colds and couldn't stop sniffing and sneezing. 我们都感冒了,一个劲地抽鼻子,打喷嚏。
  • They all had colds and were sniffing and sneezing. 他们都伤风了,呼呼喘气而且打喷嚏。 来自《现代英汉综合大词典》
2 secluded wj8zWX     
adj.与世隔绝的;隐退的;偏僻的v.使隔开,使隐退( seclude的过去式和过去分词)
参考例句:
  • Some people like to strip themselves naked while they have a swim in a secluded place. 一些人当他们在隐蔽的地方游泳时,喜欢把衣服脱光。 来自《简明英汉词典》
  • This charming cottage dates back to the 15th century and is as pretty as a picture, with its thatched roof and secluded garden. 这所美丽的村舍是15世纪时的建筑,有茅草房顶和宁静的花园,漂亮极了,简直和画上一样。 来自《简明英汉词典》
3 discriminate NuhxX     
v.区别,辨别,区分;有区别地对待
参考例句:
  • You must learn to discriminate between facts and opinions.你必须学会把事实和看法区分出来。
  • They can discriminate hundreds of colours.他们能分辨上百种颜色。
4 sniffed ccb6bd83c4e9592715e6230a90f76b72     
v.以鼻吸气,嗅,闻( sniff的过去式和过去分词 );抽鼻子(尤指哭泣、患感冒等时出声地用鼻子吸气);抱怨,不以为然地说
参考例句:
  • When Jenney had stopped crying she sniffed and dried her eyes. 珍妮停止了哭泣,吸了吸鼻子,擦干了眼泪。 来自《简明英汉词典》
  • The dog sniffed suspiciously at the stranger. 狗疑惑地嗅着那个陌生人。 来自《简明英汉词典》
5 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
6 nostrils 23a65b62ec4d8a35d85125cdb1b4410e     
鼻孔( nostril的名词复数 )
参考例句:
  • Her nostrils flared with anger. 她气得两个鼻孔都鼓了起来。
  • The horse dilated its nostrils. 马张大鼻孔。
7 judgments 2a483d435ecb48acb69a6f4c4dd1a836     
判断( judgment的名词复数 ); 鉴定; 评价; 审判
参考例句:
  • A peculiar austerity marked his judgments of modern life. 他对现代生活的批评带着一种特殊的苛刻。
  • He is swift with his judgments. 他判断迅速。
8 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
9 vice NU0zQ     
n.坏事;恶习;[pl.]台钳,老虎钳;adj.副的
参考例句:
  • He guarded himself against vice.他避免染上坏习惯。
  • They are sunk in the depth of vice.他们堕入了罪恶的深渊。
10 affected TzUzg0     
adj.不自然的,假装的
参考例句:
  • She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • His manners are affected.他的态度不自然。
11 physiological aAvyK     
adj.生理学的,生理学上的
参考例句:
  • He bought a physiological book.他买了一本生理学方面的书。
  • Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。
12 hormone uyky3     
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。
13 functional 5hMxa     
adj.为实用而设计的,具备功能的,起作用的
参考例句:
  • The telephone was out of order,but is functional now.电话刚才坏了,但现在可以用了。
  • The furniture is not fancy,just functional.这些家具不是摆着好看的,只是为了实用。
14 tightening 19aa014b47fbdfbc013e5abf18b64642     
上紧,固定,紧密
参考例句:
  • Make sure the washer is firmly seated before tightening the pipe. 旋紧水管之前,检查一下洗衣机是否已牢牢地固定在底座上了。
  • It needs tightening up a little. 它还需要再收紧些。
15 eluded 8afea5b7a29fab905a2d34ae6f94a05f     
v.(尤指机敏地)避开( elude的过去式和过去分词 );逃避;躲避;使达不到
参考例句:
  • The sly fox nimbly eluded the dogs. 那只狡猾的狐狸灵活地躲避开那群狗。 来自《现代汉英综合大词典》
  • The criminal eluded the police. 那个罪犯甩掉了警察的追捕。 来自《现代英汉综合大词典》
16 riddle WCfzw     
n.谜,谜语,粗筛;vt.解谜,给…出谜,筛,检查,鉴定,非难,充满于;vi.出谜
参考例句:
  • The riddle couldn't be solved by the child.这个谜语孩子猜不出来。
  • Her disappearance is a complete riddle.她的失踪完全是一个谜。
17 rodent DsNyh     
n.啮齿动物;adj.啮齿目的
参考例句:
  • When there is a full moon,this nocturnal rodent is careful to stay in its burrow.月圆之夜,这种夜间活动的啮齿类动物会小心地呆在地洞里不出来。
  • This small rodent can scoop out a long,narrow tunnel in a very short time.这种小啮齿动物能在很短的时间里挖出一条又长又窄的地道来。
TAG标签: tears emotional signals
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