Nicholas Christakis: The hidden influence of social networks

442,676 views ・ 2010-05-10

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譯者: Adrienne Lin 審譯者: Wang-Ju Tsai
00:16
For me, this story begins about 15 years ago,
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大約15年前
00:19
when I was a hospice doctor at the University of Chicago.
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我在芝加哥大學擔任安寧病房醫生
00:22
And I was taking care of people who were dying and their families
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我負責照顧那些瀕臨死亡的人,與他們的家人
00:25
in the South Side of Chicago.
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就在芝加哥南端
00:27
And I was observing what happened to people and their families
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我觀察這些疾病末期的人,與他們家人,
00:30
over the course of their terminal illness.
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疾病帶給他們的影響
00:33
And in my lab, I was studying the widower effect,
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我在實驗室研究守寡效應
00:35
which is a very old idea in the social sciences,
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這個想法不新穎
00:37
going back 150 years,
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150年前就有了
00:39
known as "dying of a broken heart."
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就是大家所知的「心碎而死」
00:41
So, when I die, my wife's risk of death can double,
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就是,我死了,我妻子的死亡率在第一年
00:44
for instance, in the first year.
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會增加一倍。
00:46
And I had gone to take care of one particular patient,
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當時我照顧一個
00:49
a woman who was dying of dementia.
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失智症的婦人
00:51
And in this case, unlike this couple,
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不像其他病人
00:53
she was being cared for
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她是由她女兒
00:55
by her daughter.
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負責照顧。
00:57
And the daughter was exhausted from caring for her mother.
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為照顧母親,她女兒已心力憔悴
01:00
And the daughter's husband,
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而她女婿
01:02
he also was sick
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也因為妻子的憔悴
01:05
from his wife's exhaustion.
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而生病了。
01:07
And I was driving home one day,
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我有天開車回家
01:09
and I get a phone call from the husband's friend,
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接到一通女婿的朋友打來的電話
01:12
calling me because he was depressed
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他說,因為他朋友(女婿)生病
01:14
about what was happening to his friend.
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他也心情低落。
01:16
So here I get this call from this random guy
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這通陌生人的電話
01:18
that's having an experience
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讓我有了這個體驗
01:20
that's being influenced by people
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原來人與人的影響
01:22
at some social distance.
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不止於親近的人。
01:24
And so I suddenly realized two very simple things:
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我因此意識到兩件很簡單的事情
01:27
First, the widowhood effect
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第一,守寡效應
01:29
was not restricted to husbands and wives.
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並不侷限於夫妻
01:32
And second, it was not restricted to pairs of people.
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第二,並不侷限於兩個人而已
01:35
And I started to see the world
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我開始以全新的視角
01:37
in a whole new way,
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來看這世界
01:39
like pairs of people connected to each other.
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人們一對對連結著
01:42
And then I realized that these individuals
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然後又有其他個體
01:44
would be connected into foursomes with other pairs of people nearby.
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與鄰近的這對連結,變成兩對
01:47
And then, in fact, these people
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然後這些人
01:49
were embedded in other sorts of relationships:
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又被其他關係包圍著
01:51
marriage and spousal
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婚姻、夫妻、
01:53
and friendship and other sorts of ties.
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友情等等連結
01:55
And that, in fact, these connections were vast
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事實上,這些連結很廣
01:58
and that we were all embedded in this
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我們每個人之間
02:00
broad set of connections with each other.
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都是被這許多的連結連起來的。
02:03
So I started to see the world in a completely new way
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我開始用全新的角度看這世界
02:06
and I became obsessed with this.
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並為此著迷
02:08
I became obsessed with how it might be
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我著迷於圍繞著
02:10
that we're embedded in these social networks,
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每個人的人際網路
02:12
and how they affect our lives.
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與它的影響。
02:14
So, social networks are these intricate things of beauty,
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人際關係是種美麗亦複雜的東西
02:17
and they're so elaborate and so complex
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它既精密、複雜
02:19
and so ubiquitous, in fact,
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卻又普及,事實上,
02:21
that one has to ask what purpose they serve.
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我們會問,它的功能是什麼?
02:24
Why are we embedded in social networks?
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我們為什麼會處於人際網路中?
02:26
I mean, how do they form? How do they operate?
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它們如何形成?怎麼運作?
02:28
And how do they effect us?
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是怎麼影響我們的?
02:30
So my first topic with respect to this,
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我的第一個要探討的主題,
02:33
was not death, but obesity.
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不是關於死亡,而是肥胖
02:36
It had become trendy
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突然間,大家都討論著
02:38
to speak about the "obesity epidemic."
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「肥胖流行症」
02:40
And, along with my collaborator, James Fowler,
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我和James Fowler合作
02:43
we began to wonder whether obesity really was epidemic
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共同研究為什麼肥胖會流行
02:46
and could it spread from person to person
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還有它的傳染是否像我剛所提的
02:48
like the four people I discussed earlier.
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那四個人那樣
02:51
So this is a slide of some of our initial results.
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這是我們最初的結果
02:54
It's 2,200 people in the year 2000.
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2000年研究的2200人
02:57
Every dot is a person. We make the dot size
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每個點是一個人,我們依據
02:59
proportional to people's body size;
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體型來做點的大小
03:01
so bigger dots are bigger people.
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大點點的人體型較大
03:04
In addition, if your body size,
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還有,體型、
03:06
if your BMI, your body mass index, is above 30 --
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BMI值超過30以上的
03:08
if you're clinically obese --
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在醫學上被診斷為肥胖的
03:10
we also colored the dots yellow.
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我們標為黃點
03:12
So, if you look at this image, right away you might be able to see
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各位可以看到這張圖
03:14
that there are clusters of obese and
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肥胖的人聚成一團
03:16
non-obese people in the image.
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不胖的人聚成一團
03:18
But the visual complexity is still very high.
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不過視覺上看起來還是很複雜
03:21
It's not obvious exactly what's going on.
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真正的情況看得不明顯。
03:24
In addition, some questions are immediately raised:
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另一個馬上想到的問題是
03:26
How much clustering is there?
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圖中有多少聚集?
03:28
Is there more clustering than would be due to chance alone?
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聚集的產生是否不單因為巧合?
03:31
How big are the clusters? How far do they reach?
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這些聚集有多大?各自距離有多遠?
03:33
And, most importantly,
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最重要的還有
03:35
what causes the clusters?
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形成聚集原因是什麼?
03:37
So we did some mathematics to study the size of these clusters.
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所以我們將這些聚集的大小數據化
03:40
This here shows, on the Y-axis,
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可以看到,縱軸是
03:42
the increase in the probability that a person is obese
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一個人因為週遭朋友
03:45
given that a social contact of theirs is obese
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而變胖的可能性
03:47
and, on the X-axis, the degrees of separation between the two people.
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橫軸是兩個人之間,分離的程度
03:50
On the far left, you see the purple line.
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最左邊,紫色長條顯示
03:52
It says that, if your friends are obese,
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如果你的朋友都過胖
03:54
your risk of obesity is 45 percent higher.
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你過胖的機率比別人高45%
03:57
And the next bar over, the [red] line,
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旁邊的紅色長條
03:59
says if your friend's friends are obese,
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代表如果你朋友的朋友都過胖
04:01
your risk of obesity is 25 percent higher.
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你過胖的機率比平均高出25%
04:03
And then the next line over says
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下一個長條表示
04:05
if your friend's friend's friend, someone you probably don't even know, is obese,
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如果你朋友的朋友的朋友-即使你都不認識-過胖
04:08
your risk of obesity is 10 percent higher.
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你過胖的機率比平均高出10%
04:11
And it's only when you get to your friend's friend's friend's friends
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只有到了你朋友的朋友的朋友的朋友
04:14
that there's no longer a relationship
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幾乎沒有關係可言
04:16
between that person's body size and your own body size.
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你們的體型才不會互相影響。
04:20
Well, what might be causing this clustering?
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那形成這種聚集的原因是什麼?
04:23
There are at least three possibilities:
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至少三種可能
04:25
One possibility is that, as I gain weight,
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第一,當我體重增加
04:27
it causes you to gain weight.
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你體重也增加
04:29
A kind of induction, a kind of spread from person to person.
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這是誘導性,在人與人之間的傳染
04:32
Another possibility, very obvious, is homophily,
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第二,很明顯的,同質性
04:34
or, birds of a feather flock together;
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也就是「物以類聚,人以群分」
04:36
here, I form my tie to you
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我和你的聯繫
04:38
because you and I share a similar body size.
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是因為我們體型相同
04:41
And the last possibility is what is known as confounding,
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最後一個可能性是混雜法
04:43
because it confounds our ability to figure out what's going on.
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我們搞不清楚狀況是什麼
04:46
And here, the idea is not that my weight gain
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意思是,你體重增加的原因
04:48
is causing your weight gain,
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不是因為我體重增加
04:50
nor that I preferentially form a tie with you
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也不是我選擇與你有關聯
04:52
because you and I share the same body size,
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而是因為我們有一樣的體型
04:54
but rather that we share a common exposure
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所以我們會去類似的地方
04:56
to something, like a health club
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例如健身房等等
04:59
that makes us both lose weight at the same time.
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我們一起瘦身的地方
05:02
When we studied these data, we found evidence for all of these things,
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我們研究這些數據,發現以下一些證據
05:05
including for induction.
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包含誘導性
05:07
And we found that if your friend becomes obese,
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我們發現,如果你的朋友變胖
05:09
it increases your risk of obesity by about 57 percent
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同一時期裡,你變胖的機會
05:12
in the same given time period.
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立刻增加57%
05:14
There can be many mechanisms for this effect:
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造成這種效果有很多機制
05:17
One possibility is that your friends say to you something like --
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一種情況是,你朋友的行為傳染給你
05:19
you know, they adopt a behavior that spreads to you --
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他們可能會對你說:
05:22
like, they say, "Let's go have muffins and beer,"
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「我們吃馬芬鬆糕配啤酒吧」
05:25
which is a terrible combination. (Laughter)
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這搭配好糟糕
05:28
But you adopt that combination,
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但你習慣這樣吃以後
05:30
and then you start gaining weight like them.
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你就會開始和他們一樣變胖
05:33
Another more subtle possibility
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另一種可能
05:35
is that they start gaining weight, and it changes your ideas
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是他們開始增胖,你開始改變了
05:38
of what an acceptable body size is.
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對於正常體型的看法
05:40
Here, what's spreading from person to person
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這種人與人傳染情況
05:42
is not a behavior, but rather a norm:
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不是行為改變,而是標準改變。
05:44
An idea is spreading.
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有越來越多人接受這種想法。
05:46
Now, headline writers
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有些記者
05:48
had a field day with our studies.
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將我們的研究寫成報導
05:50
I think the headline in The New York Times was,
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我想紐約時報的頭條是:
05:52
"Are you packing it on?
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「變胖了嗎?」
05:54
Blame your fat friends." (Laughter)
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「怪你朋友吧!」
05:57
What was interesting to us is that the European headline writers
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我們覺得有趣的是,歐洲的記者
05:59
had a different take: They said,
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寫了不同的頭條:
06:01
"Are your friends gaining weight? Perhaps you are to blame."
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「你朋友變胖了嗎?是你害的!」
06:04
(Laughter)
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(笑聲)
06:09
And we thought this was a very interesting comment on America,
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我們覺得很有趣,這反應出美國人那種
06:12
and a kind of self-serving,
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有點自私、
06:14
"not my responsibility" kind of phenomenon.
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「不干我的事」的態度
06:16
Now, I want to be very clear: We do not think our work
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到此,我要澄清,我們並不認為
06:18
should or could justify prejudice
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這研究能被拿來
06:20
against people of one or another body size at all.
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當作身材歧視的正當理由
06:24
Our next questions was:
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我們下一個問題是:
06:26
Could we actually visualize this spread?
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這種擴散要如何視覺化?
06:29
Was weight gain in one person actually spreading
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一個人變胖是否會連帶影響
06:31
to weight gain in another person?
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另一個人的體重?
06:33
And this was complicated because
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這很複雜
06:35
we needed to take into account the fact that the network structure,
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因為我們要考慮到網路的結構、
06:38
the architecture of the ties, was changing across time.
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連結的構造方式,是隨時在改變的
06:41
In addition, because obesity is not a unicentric epidemic,
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還有,肥胖症不是種只有單一中心的流行病
06:44
there's not a Patient Zero of the obesity epidemic --
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沒有肥胖流行病的「零號病人」-
06:47
if we find that guy, there was a spread of obesity out from him --
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疾病的原始帶原者是不存在的
06:50
it's a multicentric epidemic.
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它是有許多中心的
06:52
Lots of people are doing things at the same time.
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很多人同時做著相同的事
06:54
And I'm about to show you a 30 second video animation
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我給大家看個30秒動畫
06:57
that took me and James five years of our lives to do.
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我和James花五年研究出來的
07:00
So, again, every dot is a person.
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每個點都是一個人
07:02
Every tie between them is a relationship.
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每條線表示他們的關連
07:04
We're going to put this into motion now,
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我們現在放給大家看
07:06
taking daily cuts through the network for about 30 years.
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一睹30年的人際網路變化
07:09
The dot sizes are going to grow,
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點的大小開始變化
07:11
you're going to see a sea of yellow take over.
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會看到越來越多黃點
07:14
You're going to see people be born and die --
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也可以看到人們的出生、死亡
07:16
dots will appear and disappear --
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點的消失與形成
07:18
ties will form and break, marriages and divorces,
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連結的形成與斷裂,結婚與離婚
07:21
friendings and defriendings.
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友情的產生與破裂
07:23
A lot of complexity, a lot is happening
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非常複雜,這30年時間
07:25
just in this 30-year period
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發生了許多事情
07:27
that includes the obesity epidemic.
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包括肥胖的流行
07:29
And, by the end, you're going to see clusters
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最後,你可以看到
07:31
of obese and non-obese individuals
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肥胖、不肥胖的個體
07:33
within the network.
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在這網路裡
07:35
Now, when looked at this,
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看著這張圖
07:38
it changed the way I see things,
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改變了我看事情的角度
07:41
because this thing, this network
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因為這個網路
07:43
that's changing across time,
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隨時間變換的網路
07:45
it has a memory, it moves,
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它是有記憶的、會移動的
07:48
things flow within it,
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裏面也有很多流動
07:50
it has a kind of consistency --
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它擁有著一種持續性
07:52
people can die, but it doesn't die;
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人會死亡,但它不會
07:54
it still persists --
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永久存在
07:56
and it has a kind of resilience
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它有種恢復力
07:58
that allows it to persist across time.
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能隨時間存在著
08:00
And so, I came to see these kinds of social networks
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我將這些人際網路視為
08:03
as living things,
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活的東西
08:05
as living things that we could put under a kind of microscope
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是我們可以放到顯微鏡下觀察、研究、
08:08
to study and analyze and understand.
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並加以了解的東西
08:11
And we used a variety of techniques to do this.
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我們用了很多方式研究
08:13
And we started exploring all kinds of other phenomena.
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並開始探索其他現象
08:16
We looked at smoking and drinking behavior,
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我們觀察吸菸、酗酒的人、
08:18
and voting behavior,
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有投票習慣的人、
08:20
and divorce -- which can spread --
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離婚的人-這也會傳染
08:22
and altruism.
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還有無私。
08:24
And, eventually, we became interested in emotions.
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最後,我們對情緒感興趣
08:28
Now, when we have emotions,
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人的情緒一來
08:30
we show them.
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馬上展現出來
08:32
Why do we show our emotions?
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為什麼展現情緒?
08:34
I mean, there would be an advantage to experiencing
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我是說,如果能把生氣、開心等情緒
08:36
our emotions inside, you know, anger or happiness.
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放在心裡應該是種優點吧
08:39
But we don't just experience them, we show them.
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我們不只有情緒,我們會展現出來
08:41
And not only do we show them, but others can read them.
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我們不只會展現出來,其他人還解讀的出來
08:44
And, not only can they read them, but they copy them.
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他們不只解讀的出來,還會複製那情緒
08:46
There's emotional contagion
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這就是人類社會的
08:48
that takes place in human populations.
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情緒傳染
08:51
And so this function of emotions
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這些情緒的功能
08:53
suggests that, in addition to any other purpose they serve,
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還顯示他們有其他用途
08:55
they're a kind of primitive form of communication.
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他們是一種最基本的溝通方式
08:58
And that, in fact, if we really want to understand human emotions,
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如果我們真想了解人類的情緒
09:01
we need to think about them in this way.
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我們就需要將之視為如此
09:03
Now, we're accustomed to thinking about emotions in this way,
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我們短時間內,已經習慣
09:06
in simple, sort of, brief periods of time.
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將情緒視為溝通方式
09:09
So, for example,
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舉個例子,
09:11
I was giving this talk recently in New York City,
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我最近在紐約也做了演講
09:13
and I said, "You know when you're on the subway
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我說:「你搭地鐵時,」
09:15
and the other person across the subway car
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「坐你對面的人」
09:17
smiles at you,
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「對你微笑」
09:19
and you just instinctively smile back?"
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「你會直覺的也對他微笑。」
09:21
And they looked at me and said, "We don't do that in New York City." (Laughter)
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觀眾看著我,說:「在紐約沒人這樣做。」
09:24
And I said, "Everywhere else in the world,
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我說:「紐約除外,世界其他地方」
09:26
that's normal human behavior."
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「這是正常現象。」
09:28
And so there's a very instinctive way
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這是種直覺性的動作
09:30
in which we briefly transmit emotions to each other.
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簡單的將情緒傳給他人
09:33
And, in fact, emotional contagion can be broader still.
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事實上,這種情緒傳染是可以很廣的
09:36
Like we could have punctuated expressions of anger,
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就像暴動中,展現憤怒情緒
09:39
as in riots.
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的間接表達
09:41
The question that we wanted to ask was:
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我們想問的問題是:
09:43
Could emotion spread,
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情緒傳染是否不止
09:45
in a more sustained way than riots, across time
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在地鐵中相互微笑的兩人而已
09:48
and involve large numbers of people,
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是否可以有更多人
09:50
not just this pair of individuals smiling at each other in the subway car?
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甚至是更永續、跨時間的方式?
09:53
Maybe there's a kind of below the surface, quiet riot
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或許有那種表面下的暴動
09:56
that animates us all the time.
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永久地控制我們。
09:58
Maybe there are emotional stampedes
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也許人際網路中也有
10:00
that ripple through social networks.
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情緒潰散的情形
10:02
Maybe, in fact, emotions have a collective existence,
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又或許,情緒有種聚集存在
10:05
not just an individual existence.
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而非只是個體存在。
10:07
And this is one of the first images we made to study this phenomenon.
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這是我們為這個研究所做的圖
10:10
Again, a social network,
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同樣的,一個人際網路
10:12
but now we color the people yellow if they're happy
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黃點是快樂的人
10:15
and blue if they're sad and green in between.
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藍點是傷心的,綠點是其他
10:18
And if you look at this image, you can right away see
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這張圖可以明顯看出
10:20
clusters of happy and unhappy people,
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快樂、不快樂的人聚集
10:22
again, spreading to three degrees of separation.
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有三種程度的分散
10:24
And you might form the intuition
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馬上看的出來
10:26
that the unhappy people
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不快樂的人
10:28
occupy a different structural location within the network.
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聚集在網路裡的不同地點
10:31
There's a middle and an edge to this network,
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網路有中間及邊緣
10:33
and the unhappy people seem to be
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而不快樂的人似乎都
10:35
located at the edges.
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聚在邊緣
10:37
So to invoke another metaphor,
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用東西來比喻的話
10:39
if you imagine social networks as a kind of
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可以將人際網路想成是
10:41
vast fabric of humanity --
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一塊人性的布料
10:43
I'm connected to you and you to her, on out endlessly into the distance --
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我與你連結、你與她連結,無限的距離
10:46
this fabric is actually like
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這塊布料就有點像
10:48
an old-fashioned American quilt,
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老舊的美製棉被
10:50
and it has patches on it: happy and unhappy patches.
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上面有補丁,開心的、傷心的補丁
10:53
And whether you become happy or not
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而你快樂與否
10:55
depends in part on whether you occupy a happy patch.
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取決於你是否在快樂補丁上
10:58
(Laughter)
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(笑聲)
11:00
So, this work with emotions,
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所以,我們對情緒的研究
11:03
which are so fundamental,
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是非常基本的
11:05
then got us to thinking about: Maybe
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後來我們想,也許
11:07
the fundamental causes of human social networks
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影響人際關係的根本原因
11:09
are somehow encoded in our genes.
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也許和基因有關
11:11
Because human social networks, whenever they are mapped,
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因為人際關係,不論如何塑造
11:14
always kind of look like this:
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都是長這樣
11:16
the picture of the network.
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這是人際網路圖
11:18
But they never look like this.
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但從來不會像這樣
11:20
Why do they not look like this?
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為什麼不像這樣?
11:22
Why don't we form human social networks
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為什麼我們的人際網路
11:24
that look like a regular lattice?
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不像這樣的點陣圖?
11:26
Well, the striking patterns of human social networks,
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人際網路的獨特圖形
11:29
their ubiquity and their apparent purpose
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這種普遍性,和明顯的目的
11:32
beg questions about whether we evolved to have
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引出了一個問題:我們是否
11:34
human social networks in the first place,
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天生就有這種人際網路,
11:36
and whether we evolved to form networks
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或者我們網路獨特樣貌的形成
11:38
with a particular structure.
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是後天進化的?
11:40
And notice first of all -- so, to understand this, though,
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要解答這問題
11:42
we need to dissect network structure a little bit first --
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我們需要解剖這網路
11:45
and notice that every person in this network
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注意這網路的每個人
11:47
has exactly the same structural location as every other person.
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與其他人同處相同的地點
11:50
But that's not the case with real networks.
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但真正的網路並非如此
11:53
So, for example, here is a real network of college students
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這裡是一間東北方頂尖大學的
11:55
at an elite northeastern university.
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學生人際關係圖
11:58
And now I'm highlighting a few dots.
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我標出幾個明顯的點
12:00
If you look here at the dots,
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看看這些點
12:02
compare node B in the upper left
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比較左上的節點B
12:04
to node D in the far right;
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與最右邊的節點D
12:06
B has four friends coming out from him
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B有四個朋友
12:08
and D has six friends coming out from him.
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而D有六個朋友
12:11
And so, those two individuals have different numbers of friends.
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這兩個人有不同數量的朋友
12:14
That's very obvious, we all know that.
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很明顯啊,不用解釋
12:16
But certain other aspects
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但其他方面
12:18
of social network structure are not so obvious.
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這種人際結構就沒那麼明顯了
12:20
Compare node B in the upper left to node A in the lower left.
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比較節點B與左下的節點A
12:23
Now, those people both have four friends,
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這些人各有四個朋友
12:26
but A's friends all know each other,
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但A的朋友互相認識
12:28
and B's friends do not.
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而B的朋友則不是
12:30
So the friend of a friend of A's
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所以A的朋友的朋友
12:32
is, back again, a friend of A's,
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也是A的朋友
12:34
whereas the friend of a friend of B's is not a friend of B's,
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然而,B的朋友的朋友,不是B的朋友
12:36
but is farther away in the network.
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而是在網路的更遠端
12:38
This is known as transitivity in networks.
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這是網路的傳遞性
12:41
And, finally, compare nodes C and D:
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最後,比較節點C、節點D
12:43
C and D both have six friends.
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兩者都有六個朋友,
12:46
If you talk to them, and you said, "What is your social life like?"
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如果你問:「你的社交生活如何?」
12:49
they would say, "I've got six friends.
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他們會答:「我有六個朋友,」
12:51
That's my social experience."
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「這是我的交友經驗」
12:53
But now we, with a bird's eye view looking at this network,
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現在我們鳥瞰這張圖
12:56
can see that they occupy very different social worlds.
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可以發現他們的社交圈是完全不同的
12:59
And I can cultivate that intuition in you by just asking you:
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現在用直覺回答這問題:
13:01
Who would you rather be
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如果有種致命病毒
13:03
if a deadly germ was spreading through the network?
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正在這網路傳播
13:05
Would you rather be C or D?
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你要選節點C還是D?
13:08
You'd rather be D, on the edge of the network.
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你會選D,在人際網路邊緣
13:10
And now who would you rather be
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現在,如果是聊八卦
13:12
if a juicy piece of gossip -- not about you --
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講別人的八卦,不是你的
13:15
was spreading through the network? (Laughter)
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這種情況你選哪個?
13:17
Now, you would rather be C.
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你會選C吧
13:19
So different structural locations
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所以不同的結構點
13:21
have different implications for your life.
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對於人生有不同的含意
13:23
And, in fact, when we did some experiments looking at this,
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事實上,我們為此做了些實驗
13:26
what we found is that 46 percent of the variation
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朋友數量多寡的差異
13:29
in how many friends you have
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有46%都是可以用基因
13:31
is explained by your genes.
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來解釋
13:33
And this is not surprising. We know that some people are born shy
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這並不新奇,我們都知道,有些人天生害羞
13:36
and some are born gregarious. That's obvious.
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有些人天生合群,這是顯而易見的
13:39
But we also found some non-obvious things.
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但我們也發現了些不那麼明顯的東西
13:41
For instance, 47 percent in the variation
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例如,你的朋友們是否互相認識
13:44
in whether your friends know each other
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其中47%的差異
13:46
is attributable to your genes.
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是和你的基因有關。
13:48
Whether your friends know each other
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你的朋友是否互相認識
13:50
has not just to do with their genes, but with yours.
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是與你的基因有關,而不是他們的。
13:53
And we think the reason for this is that some people
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我們認為,這原因在於有些人
13:55
like to introduce their friends to each other -- you know who you are --
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喜歡把自己的朋友介紹給彼此
13:58
and others of you keep them apart and don't introduce your friends to each other.
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而其他人喜歡把朋友們分開,不介紹給彼此
14:01
And so some people knit together the networks around them,
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所以有些人將他們的人際網路編織在一起
14:04
creating a kind of dense web of ties
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形成了緊密的網路
14:06
in which they're comfortably embedded.
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並舒服的身處其中
14:08
And finally, we even found that
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最後,我們還發現
14:10
30 percent of the variation
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不論你是處在
14:12
in whether or not people are in the middle or on the edge of the network
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網路中心或邊緣,30%的差異
14:15
can also be attributed to their genes.
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也是和基因有關
14:17
So whether you find yourself in the middle or on the edge
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所以不管你是在中心還是邊緣
14:19
is also partially heritable.
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有一部分是遺傳的
14:22
Now, what is the point of this?
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所以,這表示什麼?
14:25
How does this help us understand?
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它如何讓我們了解這世界?
14:27
How does this help us
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它如何幫助我們
14:29
figure out some of the problems that are affecting us these days?
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了解我們現在所面臨的問題?
14:33
Well, the argument I'd like to make is that networks have value.
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我的論點是,這些人際網路充滿價值
14:36
They are a kind of social capital.
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就如一種社會資產
14:39
New properties emerge
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新特性的出現
14:41
because of our embeddedness in social networks,
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是因為包圍我們的人際網路
14:43
and these properties inhere
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以及形成網路結構
14:46
in the structure of the networks,
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所固有的這些特性
14:48
not just in the individuals within them.
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不單只是其中的個體而已
14:50
So think about these two common objects.
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看看這兩個常見的東西
14:52
They're both made of carbon,
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都用碳做的
14:54
and yet one of them has carbon atoms in it
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但其中一個是碳原子
14:57
that are arranged in one particular way -- on the left --
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以獨特的方式組合而成
15:00
and you get graphite, which is soft and dark.
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就是左邊的石墨,柔軟漆黑
15:03
But if you take the same carbon atoms
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一樣的碳原子
15:05
and interconnect them a different way,
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以不同的方式組合
15:07
you get diamond, which is clear and hard.
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就變成鑽石,透徹堅硬
15:10
And those properties of softness and hardness and darkness and clearness
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而這些柔軟、堅硬、漆黑、透徹的屬性
15:13
do not reside in the carbon atoms;
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並不是碳原子造成的
15:15
they reside in the interconnections between the carbon atoms,
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而是碳原子間的組合方式
15:18
or at least arise because of the
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或者說,至少是因為
15:20
interconnections between the carbon atoms.
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碳原子間的組合方式造成的
15:22
So, similarly, the pattern of connections among people
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同樣的,人與人之間的關聯
15:25
confers upon the groups of people
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也賜與各組群
15:28
different properties.
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不同的屬性
15:30
It is the ties between people
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正是這種連結
15:32
that makes the whole greater than the sum of its parts.
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讓整體變的比個體還好很多。
15:35
And so it is not just what's happening to these people --
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所以,不只是這些人所經歷的事-
15:38
whether they're losing weight or gaining weight, or becoming rich or becoming poor,
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像減肥、增肥,變有錢或變窮、
15:41
or becoming happy or not becoming happy -- that affects us;
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變得快樂、不快樂-在影響著我們
15:44
it's also the actual architecture
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同時影響我們的
15:46
of the ties around us.
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還有我們的連結架構。
15:48
Our experience of the world
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我們在世上的經歷
15:50
depends on the actual structure
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取決於我們所處網路的
15:52
of the networks in which we're residing
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實際連結架構
15:54
and on all the kinds of things that ripple and flow
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以及在網路中,各種事情
15:57
through the network.
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所激盪的漣漪
16:00
Now, the reason, I think, that this is the case
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我想,這是因為
16:03
is that human beings assemble themselves
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人類形成群落
16:05
and form a kind of superorganism.
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組合成一種「超級個體」
16:09
Now, a superorganism is a collection of individuals
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超級個體是每個獨立個體的集合
16:12
which show or evince behaviors or phenomena
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表現出的行為或現象
16:15
that are not reducible to the study of individuals
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無法藉由研究個體而得知。
16:18
and that must be understood by reference to,
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而需要了解、研究
16:20
and by studying, the collective.
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整個群體
16:22
Like, for example, a hive of bees
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例如,一窩蜜蜂
16:25
that's finding a new nesting site,
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正在找新的巢穴地點
16:28
or a flock of birds that's evading a predator,
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還有一群躲避掠食者、
16:30
or a flock of birds that's able to pool its wisdom
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或是利用群體智慧
16:33
and navigate and find a tiny speck
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尋找太平洋裡的
16:35
of an island in the middle of the Pacific,
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一座小島的鳥兒
16:37
or a pack of wolves that's able
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或是一群合作
16:39
to bring down larger prey.
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攻擊獵物的狼。
16:42
Superorganisms have properties
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超級個體的屬性
16:44
that cannot be understood just by studying the individuals.
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無法藉由研究單一個體來了解
16:47
I think understanding social networks
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我認為,了解人際關係
16:49
and how they form and operate
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了解它的形成與運作
16:51
can help us understand not just health and emotions
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可以幫助我們了解健康和情感
16:54
but all kinds of other phenomena --
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甚至其他現象-
16:56
like crime, and warfare,
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例如犯罪、福利、
16:58
and economic phenomena like bank runs
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或是經濟現象,例如銀行擠兌、
17:00
and market crashes
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市場崩盤、
17:02
and the adoption of innovation
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對於創新的適應、
17:04
and the spread of product adoption.
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產品適應的傳播等。
17:06
Now, look at this.
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看這結果
17:09
I think we form social networks
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我想,我們彼此建立關係
17:11
because the benefits of a connected life
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是因為這種連結的生活
17:13
outweigh the costs.
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利大於弊
17:16
If I was always violent towards you
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如果我總是對你暴力相向
17:18
or gave you misinformation
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或給你錯誤資訊
17:20
or made you sad or infected you with deadly germs,
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或讓你難過、傳染致命病毒給你
17:23
you would cut the ties to me,
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你就會和我斷交
17:25
and the network would disintegrate.
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這關係就會因此瓦解
17:27
So the spread of good and valuable things
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美好事物的傳播
17:30
is required to sustain and nourish social networks.
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需要永續、良好的人際關係
17:34
Similarly, social networks are required
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相同的,人際關係也需要
17:36
for the spread of good and valuable things,
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美好事物的傳播
17:39
like love and kindness
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像是愛與善良、
17:41
and happiness and altruism
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快樂與無私、
17:43
and ideas.
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新點子
17:45
I think, in fact, that if we realized
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我認為,如果我們可以意識到
17:47
how valuable social networks are,
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人際關係的價值
17:49
we'd spend a lot more time nourishing them and sustaining them,
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我們就會花更多時間來培養、維持
17:52
because I think social networks
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因為我認為人際關係
17:54
are fundamentally related to goodness.
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在本質上是與善良相連的
17:57
And what I think the world needs now
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我想現在世界所需的
17:59
is more connections.
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是更多連結
18:01
Thank you.
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謝謝
18:03
(Applause)
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(掌聲)
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