Why we laugh | Sophie Scott

Hi. I’m going to talk
to you today about laughter, and I just want to start
by thinking about the first time I can ever remember noticing laughter. This is when I was a little girl.
I would’ve been about six. And I came across my parents
doing something unusual, where they were laughing. They were laughing very, very hard. They were lying on the floor laughing. They were screaming with laughter. I did not know what they were
laughing at, but I wanted in. I wanted to be part of that, and I kind of sat around at the edge
going, “Hoo hoo!” (Laughter) Now, incidentally,
what they were laughing at was a song which people used to sing, which was based around
signs in toilets on trains telling you what you could
and could not do in toilets on trains. And the thing you have to remember
about the English is, of course, we do have an immensely
sophisticated sense of humor. (Laughter) At the time, though, I didn’t
understand anything of that. I just cared about the laughter, and actually, as a neuroscientist,
I’ve come to care about it again. And it is a really weird thing to do. What I’m going to do now
is just play some examples of real human beings laughing, and I want you think about the sound
people make and how odd that can be, and in fact how primitive
laughter is as a sound. It’s much more like an animal call
than it is like speech. So here we’ve got some laughter for you.
The first one is pretty joyful. (Audio: Laughing) Now this next guy, I need him to breathe. There’s a point in there
where I’m just, like, you’ve got to get some air in there, mate, because he just sounds
like he’s breathing out. (Audio: Laughing) This hasn’t been edited; this is him. (Audio: Laughing)
(Laughter) And finally we have —
this is a human female laughing. And laughter can take us to some pretty
odd places in terms of making noises. (Audio: Laughing) She actually says, “Oh my God,
what is that?” in French. We’re all kind of with her.
I have no idea. Now, to understand laughter,
you have to look at a part of the body that psychologists and neuroscientists
don’t normally spend much time looking at, which is the ribcage, and it doesn’t seem terribly exciting, but actually you’re all using
your ribcage all the time. What you’re all doing
at the moment with your ribcage, and don’t stop doing it, is breathing. So you use the intercostal muscles,
the muscles between your ribs, to bring air in and out of your lungs just by expanding
and contracting your ribcage, and if I was to put a strap
around the outside of your chest called a breath belt, and just look
at that movement, you see a rather gentle sinusoidal
movement, so that’s breathing. You’re all doing it. Don’t stop. As soon as you start talking, you start using your breathing
completely differently. So what I’m doing now is you see
something much more like this. In talking, you use very fine
movements of the ribcage to squeeze the air out — and in fact, we’re the only animals
that can do this. It’s why we can talk at all. Now, both talking and breathing
has a mortal enemy, and that enemy is laughter, because what happens when you laugh is those same muscles
start to contract very regularly, and you get this very marked
sort of zig-zagging, and that’s just squeezing
the air out of you. It literally is that basic a way
of making a sound. You could be stamping on somebody,
it’s having the same effect. You’re just squeezing air out, and each of those contractions —
Ha! — gives you a sound. And as the contractions run together,
you can get these spasms, and that’s when you start getting
these — (Wheezing) — things happening. I’m brilliant at this. (Laughter) Now, in terms of the science of laughter,
there isn’t very much, but it does turn out that pretty much
everything we think we know about laughter is wrong. So it’s not at all unusual, for example,
to hear people to say humans are the only animals that laugh. Nietzsche thought that humans
are the only animals that laugh. In fact, you find laughter
throughout the mammals. It’s been well-described
and well-observed in primates, but you also see it in rats, and wherever you find it — humans, primates, rats — you find it associated
with things like tickling. That’s the same for humans. You find it associated with play,
and all mammals play. And wherever you find it,
it’s associated with interactions. So Robert Provine, who has done
a lot of work on this, has pointed out that you are 30 times
more likely to laugh if you are with somebody else
than if you’re on your own, and where you find most laughter is in social interactions
like conversation. So if you ask human beings,
“When do you laugh?” they’ll talk about comedy and they’ll talk
about humor and they’ll talk about jokes. If you look at when they laugh,
they’re laughing with their friends. And when we laugh with people, we’re
hardly ever actually laughing at jokes. You are laughing to show people
that you understand them, that you agree with them, that you’re
part of the same group as them. You’re laughing to show
that you like them. You might even love them. You’re doing all that at the same time
as talking to them, and the laughter is doing a lot
of that emotional work for you. Something that Robert Provine
has pointed out, as you can see here, and the reason why we were laughing when we heard those
funny laughs at the start, and why I was laughing
when I found my parents laughing, is that it’s an enormously
behaviorally contagious effect. You can catch laughter from somebody else, and you are more likely to catch laughter
off somebody else if you know them. So it’s still modulated
by this social context. You have to put humor to one side and think about the social
meaning of laughter because that’s where its origins lie. Now, something I’ve got very interested in
is different kinds of laughter, and we have some neurobiological evidence
about how human beings vocalize that suggests there might be
two kinds of laughs that we have. So it seems possible that the neurobiology
for helpless, involuntary laughter, like my parents lying on the floor
screaming about a silly song, might have a different basis to it
than some of that more polite social laughter that you encounter,
which isn’t horrible laughter, but it’s behavior somebody is doing
as part of their communicative act to you, part of their interaction with you;
they are choosing to do this. In our evolution, we have developed
two different ways of vocalizing. Involuntary vocalizations
are part of an older system than the more voluntary vocalizations
like the speech I’m doing now. So we might imagine that laughter
might actually have two different roots. So I’ve been looking at this
in more detail. To do this, we’ve had to make
recordings of people laughing, and we’ve had to do whatever it takes
to make people laugh, and we got those same people
to produce more posed, social laughter. So imagine your friend told a joke, and you’re laughing because
you like your friend, but not really because
the joke’s all that. So I’m going to play you
a couple of those. I want you to tell me if you think
this laughter is real laughter, or if you think it’s posed. So is this involuntary laughter
or more voluntary laughter? (Audio: Laughing) What does that sound like to you? Audience: Posed.
Sophie Scott: Posed? Posed. How about this one? (Audio: Laughing) (Laughter) I’m the best. (Laughter) (Applause) Not really. No, that was helpless laughter, and in fact, to record that,
all they had to do was record me watching one of my friends listening to
something I knew she wanted to laugh at, and I just started doing this. What you find is that people
are good at telling the difference between real and posed laughter. They seem to be different things to us. Interestingly, you see something
quite similar with chimpanzees. Chimpanzees laugh differently
if they’re being tickled than if they’re playing with each other, and we might be seeing
something like that here, involuntary laughter, tickling laughter,
being different from social laughter. They’re acoustically very different. The real laughs are longer.
They’re higher in pitch. When you start laughing hard, you start squeezing air out
from your lungs under much higher pressures
than you could ever produce voluntarily. For example, I could never
pitch my voice that high to sing. Also, you start to get these sort of
contractions and weird whistling sounds, all of which mean that real laughter
is extremely easy, or feels extremely easy to spot. In contrast, posed laughter,
we might think it sounds a bit fake. Actually, it’s not, it’s actually
an important social cue. We use it a lot, we’re choosing
to laugh in a lot of situations, and it seems to be its own thing. So, for example, you find
nasality in posed laughter, that kind of “ha ha ha ha ha” sound that you never get, you could not do,
if you were laughing involuntarily. So they do seem to be genuinely
these two different sorts of things. We took it into the scanner
to see how brains respond when you hear laughter. And when you do this,
this is a really boring experiment. We just played people
real and posed laughs. We didn’t tell them
it was a study on laughter. We put other sounds in there
to distract them, and all they’re doing
is lying listening to sounds. We don’t tell them to do anything. Nonetheless, when you hear real laughter
and when you hear posed laughter, the brains are responding
completely differently, significantly differently. What you see in the regions in blue,
which lies in auditory cortex, are the brain areas that respond
more to the real laughs, and what seems to be the case, when you hear somebody
laughing involuntarily, you hear sounds you would never
hear in any other context. It’s very unambiguous, and it seems to be associated
with greater auditory processing of these novel sounds. In contrast, when you hear somebody
laughing in a posed way, what you see are these regions in pink, which are occupying brain areas
associated with mentalizing, thinking about what
somebody else is thinking. And I think what that means is, even if you’re having your brain scanned,
which is completely boring and not very interesting, when you hear somebody going,
“A ha ha ha ha ha,” you’re trying to work out
why they’re laughing. Laughter is always meaningful. You are always trying
to understand it in context, even if, as far as you are concerned,
at that point in time, it has not necessarily
anything to do with you, you still want to know
why those people are laughing. Now, we’ve had the opportunity to look
at how people hear real and posed laughter across the age range. So this is an online experiment
we ran with the Royal Society, and here we just asked people
two questions. First of all, they heard some laughs, and they had to say, how real
or posed do these laughs sound? The real laughs are shown in red
and the posed laughs are shown in blue. What you see is there is a rapid onset. As you get older, you get better
and better at spotting real laughter. So six-year-olds are at chance,
they can’t really hear the difference. By the time you are older, you get better, but interestingly, you do not hit
peak performance in this dataset until you are in your
late 30s and early 40s. You don’t understand laughter fully
by the time you hit puberty. You don’t understand laughter fully
by the time your brain has matured at the end of your teens. You’re learning about laughter
throughout your entire early adult life. If we turn the question around and now say
not, what does the laughter sound like in terms of being real
or posed, but we say, how much does this laughter
make you want to laugh, how contagious is this laughter to you,
we see a different profile. And here, the younger you are, the more you want to join in
when you hear laughter. Remember me laughing with my parents
when I had no idea what was going on. You really can see this. Now everybody, young and old, finds the real laughs more contagious
than the posed laughs, but as you get older, it all becomes
less contagious to you. Now, either we’re all just becoming
really grumpy as we get older, or it may mean that as you
understand laughter better, and you are getting better at doing that, you need more than just
hearing people laugh to want to laugh. You need the social stuff there. So we’ve got a very interesting behavior about which a lot of our
lay assumptions are incorrect, but I’m coming to see that actually
there’s even more to laughter than it’s an important social emotion
we should look at, because it turns out
people are phenomenally nuanced in terms of how we use laughter. There’s a really lovely
set of studies coming out from Robert Levenson’s lab in California, where he’s doing
a longitudinal study with couples. He gets married couples,
men and women, into the lab, and he gives them
stressful conversations to have while he wires them up to a polygraph
so he can see them becoming stressed. So you’ve got the two of them in there,
and he’ll say to the husband, “Tell me something that your wife does
that irritates you.” And what you see is immediately — just run that one through your head
briefly, you and your partner — you can imagine everybody gets a bit
more stressed as soon as that starts. You can see physically,
people become more stressed. What he finds is that the couples
who manage that feeling of stress with laughter,
positive emotions like laughter, not only immediately become less stressed, they can see them
physically feeling better, they’re dealing with this
unpleasant situation better together, they are also the couples that report high levels of satisfaction
in their relationship and they stay together for longer. So in fact, when you look
at close relationships, laughter is a phenomenally useful index of how people are regulating
their emotions together. We’re not just emitting it at each other
to show that we like each other, we’re making ourselves
feel better together. Now, I don’t think this is going
to be limited to romantic relationships. I think this is probably
going to be a characteristic of close emotional relationships
such as you might have with friends, which explains my next clip, which is of a YouTube video of some
young men in the former East Germany on making a video to promote
their heavy metal band, and it’s extremely macho,
and the mood is very serious, and I want you to notice
what happens in terms of laughter when things go wrong and how quickly that happens,
and how that changes the mood. He’s cold. He’s about to get wet.
He’s got swimming trunks on, got a towel. Ice. What might possibly happen? Video starts. Serious mood. And his friends are already laughing.
They are already laughing, hard. He’s not laughing yet. (Laughter) He’s starting to go now. And now they’re all off. (Laughter) They’re on the floor. (Laughter) The thing I really like about that
is it’s all very serious until he jumps onto the ice, and
as soon as he doesn’t go through the ice, but also there isn’t blood
and bone everywhere, his friends start laughing. And imagine if that had played him out
with him standing there going, “No seriously, Heinrich,
I think this is broken,” we wouldn’t enjoy watching that.
That would be stressful. Or if he was running around
with a visibly broken leg laughing, and his friends are going, “Heinrich, I
think we need to go to the hospital now,” that also wouldn’t be funny. The fact that the laughter works, it gets him from a painful,
embarrassing, difficult situation, into a funny situation, into what we’re
actually enjoying there, and I think that’s
a really interesting use, and it’s actually happening all the time. For example, I can remember
something like this happening at my father’s funeral. We weren’t jumping around
on the ice in our underpants. We’re not Canadian. (Laughter) (Applause) These events are always difficult, I had
a relative who was being a bit difficult, my mum was not in a good place, and I can remember finding myself
just before the whole thing started telling this story about something
that happened in a 1970s sitcom, and I just thought at the time,
I don’t know why I’m doing this, and what I realized I was doing was I was coming up with
something from somewhere I could use to make her laugh
together with me. It was a very basic reaction
to find some reason we can do this. We can laugh together.
We’re going to get through this. We’re going to be okay. And in fact, all of us
are doing this all the time. You do it so often,
you don’t even notice it. Everybody underestimates
how often they laugh, and you’re doing something,
when you laugh with people, that’s actually letting you access
a really ancient evolutionary system that mammals have evolved
to make and maintain social bonds, and clearly to regulate emotions,
to make ourselves feel better. It’s not something specific to humans —
it’s a really ancient behavior which really helps us regulate how we feel
and makes us feel better. In other words, when it comes to laughter, you and me, baby, ain’t nothing
but mammals. (Laughter) Thank you. Thank you. (Applause)

100 Replies to “Why we laugh | Sophie Scott”

  1. So the ability of humans to talk is our ribcage,not our vocal cords. Fascinating. I guess it makes sense. Most animals have vocal cords, so they're not unique.

    Edit: We laugh to get out of uncomfortable situations. Is that why cats purr when they're injured? Is purring how cats laugh? I also heard something about how a cat's purr is at a frequency that speeds the healing of broken bones. Does laughter have a similar effect on humans? Also… (blue screen)

  2. My theory on why we laugh is so psychological. I think it's because whatever happens reminds us about ourselves or something in our lives (pain?) which then evokes a humorous emotional reaction.

    We start to Love the person who purposely makes us genuinely laugh. Probably because we can see that they understand how we feel on a deeper level.

    Laughter hits so close to home more than you imagine. It's so personal.

    Like she said, it takes the pain out of us. It replaces pain with a good mood.

  3. She is funny and cute, but I couldn't get over her yellow teeth. for fox sake, you don't give a TED talk everyday. Good infos, though.

  4. does anyone know what video she's referring too, though? about the toilet signs on the train.

  5. I watched on Delta Airline flight from London Heathrow UK to Minneapolis Minnesota USA,it made my journey easier.worth to watch and enjoy .

  6. At the first,
    i noticed her more than f cup breast.
    'What the beautiful milf!'
    But after a short while, i found that her tummy is greatest in the world.
    'Wow she is elephant'

  7. I don't think she actually explained to us why we laugh. sure it has something to do with social interactions, but none of the research she mentioned actually looks at why we laugh as opposed to screaming at the top of our voices when we want to bond in a social context. I mean, why is this the reaction we evolved, rather than something else?

  8. extremely fascinating especially cuz I'm a stand-up comic and it makes a lot more sense to me now thought this was great unbelievable actually

  9. I'm just a minor in anthropology but I've studied it for years. It's my opinion laughter developed as a way to demonstrate there is no danger. For example someone falls out of a tree, which could have been a fatal fall. They stand up and his or her friends all laugh as if to say, "it's okay". So of tickling? Same thing. You see two roughing it up,. Now if one is screaming, well then you know something's wrong. But laughter that's a signal,"oh,they're just playing around." I think it developed as a way to help early hominoids the ability to continue on doing what they're doing and by a simple sound they don't have to run and protect others.

  10. very useful information. thank you. I wonder if laughter has been a naturally adaptive technique the poor and disparaged us in order to decompress from their circumstances. since they find the most grusome or cruel acts funny. when others don't.

  11. There is a wrong in discription no 13 times but like in speach 30 times more likely to laugh if you're with somebody else than if you're alone. 😉

  12. Just brilliant. I love the way she explains laughter. Is so much behind it. We all need a good laugh and I think is just impossible to not laugh every single day. When LAUGH stops I am pretty sure human kind will be all gone. SO LET´S HAVE A GOOD LAUGH.

  13. I mean no offense, but I wish for her so much to talk slower and be more relaxed, 'cause the way she speaks stresses me a lot and it becomes less enjoyable, despite being an interesting topic.

  14. I've never understood why some people, usually males, laugh when they see someone get injured. I've always thought that it must be because they have low empathy. When I see someone get hurt my whole body tenses up involuntarily and I get a unpleasant sensation similar to shivering. It never makes me laugh. It was interesting to hear Sophie Scott's theory that the group laughs to encouraged the injured person to laugh in order to counteract the pain they are feeling. Maybe that's possible, although I feel a bit skeptical as none of my personal experience backs that up. The few times I have been laughed at when I was injured, made me feel worse not better.

  15. I think whether you'll laugh or not also depends about the age of the person laughing. That is why young people laughed at the voice of an adult and older people didn't so much.

  16. That wasn't actually the girl laughing. I am especially disappointed because I used to love to listen to these. How am I supposed to trust any of the information that comes out of these anymore. Congratulations Sophie Scott, You ruined TED talk for everyone. Goodbye and Goodnight!

  17. Unquestionably, by the remembrance of Allah hearts are assured. (The Noble Quran. Surah Ar Ra'd Verse 28)
    Ja! Beim Gedenken ALLAHs finden die Herzen Ruhe. Sicherlich, im Gedenken Allahs finden die Herzen Ruhe!
    N’est- ce pas point par le Zikir d’Allah que les cœurs sont satisfaits.
    The Prophet Muhammad (peace and blessings of Allah be upon him) said: “Woe to the one who tells lies to make people laugh, woe to him.”
    The purpose of our life is that:
    English: And I did not create the jinn and mankind except to worship Me. (The Noble Quran. Surah Adh Dhariyat. Verse 56)
    Germany: Und Ich habe die Ginn und die Menschen nur darum erschaffen, damit sie Mir dienen (sollen)
    French: Je n'ai créé les djinns et les hommes que pour qu'ils M'adorent.
    Listen to the voice of the Noble Quran.
    Maybe your life will BE changed If God allows.
    French : https://www.youtube.com/watch?v=lVY8pwx9B74
    English: https://www.youtube.com/watch?v=Omh4oG8T_Fw
    German: https://www.youtube.com/watch?v=EXWTxB6oS6I

  18. I watched The Ghost and Mr. Chicken with Don Knotts tonight – alone – and laughed my a$$ off. No kidding, I fell out of my chair. I didn't need anyone there and I didn't need anthropology. It was damn funny. It was DON KNOTTS!

  19. Description should say "30x times more likely" not 13x. Time Magazine did an edition on The Science of Laughter and they quote this same study by Robert Provine.

  20. this is one of the best ted talks in have seen, she seems to be such a lovely person and is so right , laughter is the key to happy relationships

  21. I love to laugh so much but the person who made me laugh enormously is back in my past over forty years ago .Jim Flushing from Flushing, Michigan WHERE ARE YOU OUT THERE !!! I love to make people laugh. My brother said I am a natural comedian. And I was trying to get discovered for something all my life. My other brother calls me Crazy Lou cuz I make him laugh. Love this subject you talked of.

  22. I want to obtain lots of money in only a few hours every day so I tried out using every single approach and tactic about it. Thankfully, my good friend told me about “Jαmjο Sutu”. You might want to seek it on Google also. make more than a hundred bucks through it every single day. I advise you to give it a go as well. .

  23. Absurd.You don't need interaction for laughter. Imma be sitting alone and remember something funny(Probably from "Friends" ) and Imma laugh like I'm the last person on Earth.

  24. I don't agree with women taken positions from men in science. Like this woman. Feminism and general consent to women in science has hurt science.
    i don't agree with all this jazz about human laughter.
    Laughter is SIMPLY a end of a spectrum in sounds expressing thoughts. In the passion the sounds bunch up, run out breath, and repeat or bounce.

  25. I wondered if she was referring to the 1970s sitcom episode of The Brady Bunch, where Jan is going for her driver's test, and someone recommends that she imagined the state trooper dressed in his underwear. When she goes for her driver's test and imagines that, she starts laughing, and relaxing and does a good job on her driver's test.

    She doesn't point out how similar laughing and crying can sound and how we also are affected by others crying.

  26. I recently had my wisdom teeth removed and the number one rule is "do not laugh because you will tear your sutures and bleed everywhere" and I have to tell you, it was one of that hardest things I have ever had to do.

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