The optimism bias | Tali Sharot

551,354 views ・ 2012-05-14

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00:00
Translator: Timothy Covell Reviewer: Morton Bast
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Prevoditelj: Dalibora Behmen Recezent: Mislav Ante Omazić - EFZG
00:15
I'm going to talk to you about optimism --
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Govorit ću vam o optimizmu --
00:18
or more precisely, the optimism bias.
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ili, preciznije rečeno, o sklonosti optimizmu.
00:21
It's a cognitive illusion
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To je kognitivna iluzija
00:22
that we've been studying in my lab for the past few years,
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koju smo proučavali u mom laboratoriju nekoliko proteklih godina.
00:25
and 80 percent of us have it.
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i koju ima 80 posto svih nas.
00:27
It's our tendency to overestimate
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To je naša sklonost precjenjivanju vjerojatnosti
00:30
our likelihood of experiencing good events in our lives
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da ćemo doživjeti dobre događaje u našim životima
00:33
and underestimate our likelihood of experiencing bad events.
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i podcjenjivanju vjerojatnosti da ćemo doživjeti loše događaje.
00:37
So we underestimate our likelihood of suffering from cancer,
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Dakle podcjenjujemo vjerojatnost da ćemo oboljeti od raka
00:40
being in a car accident.
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ili doživjeti prometnu nezgodu.
00:41
We overestimate our longevity, our career prospects.
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Precjenjujemo našu dugovječnost, naš napredak u karijeri.
00:44
In short, we're more optimistic than realistic,
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Ukratko, više smo optimistični, nego realistični,
00:48
but we are oblivious to the fact.
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ali nismo svjesni toga.
00:50
Take marriage for example.
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Uzmite brak za primjer.
00:52
In the Western world, divorce rates are about 40 percent.
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U zapadnom svijetu, stopa razvoda je oko 40 posto.
00:56
That means that out of five married couples,
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To znači da će dva od pet brakova
00:59
two will end up splitting their assets.
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završiti dijeljenjem imovine.
01:02
But when you ask newlyweds about their own likelihood of divorce,
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No kada upitate mladence o vjerojatnosti raspada njihovog braka,
01:05
they estimate it at zero percent.
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oni je procjenjuju s nula posto.
01:09
And even divorce lawyers, who should really know better,
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Čak i odvjetnici za brakorazvodne parnice, koji bi trebali znati bolje,
01:13
hugely underestimate their own likelihood of divorce.
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uvelike podcjenjuju vjerojatnost raspada vlastitog braka.
01:17
So it turns out that optimists are not less likely to divorce,
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Dakle ispostavlja se da za optimiste nije manja vjerojatnost da će se razvesti,
01:20
but they are more likely to remarry.
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ali je veća vjerojatnost da će ponovo stupiti u brak.
01:22
In the words of Samuel Johnson,
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Riječima Samuela Johnsona,
01:25
"Remarriage is the triumph of hope over experience."
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"Ponovno stupanje u brak je pobjeda nade nad iskustvom."
01:29
(Laughter)
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(Smijeh)
01:30
So if we're married, we're more likely to have kids.
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Ako smo u braku, veća je vjerojatnost da ćemo imati djecu.
01:35
And we all think our kids will be especially talented.
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I svi mislimo kako će naša djeca biti posebno nadarena.
01:38
This, by the way, is my two-year-old nephew, Guy.
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Ovo je, usput rečeno, moj dvogodišnji nećak Guy.
01:41
And I just want to make it absolutely clear
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I želim samo naglasiti
01:43
that he's a really bad example of the optimism bias,
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da je on uistinu loš primjer sklonosti optimizmu,
01:46
because he is in fact uniquely talented.
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jer je on stvarno iznimno nadaren.
01:49
(Laughter)
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(Smijeh)
01:50
And I'm not alone.
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I ja nisam jedina koja ovako razmišlja.
01:52
Out of four British people, three said
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Troje od četvoro Britanaca su rekli
01:54
that they were optimistic about the future of their own families.
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kako su optimistični u vezi budućnosti svojih obitelji.
01:58
That's 75 percent.
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To je 75 posto.
02:00
But only 30 percent said
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Ali samo 30 posto ih je reklo
02:02
that they thought families in general
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kako misle da je obiteljima, općenito govoreći,
02:05
are doing better than a few generations ago.
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bolje nego što je bilo prije nekoliko generacija.
02:07
And this is a really important point,
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Ovo je vrlo važno istaknuti
02:09
because we're optimistic about ourselves,
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zato što pokazuje da smo optimistični u vezi nas samih,
02:11
we're optimistic about our kids,
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optimistični smo u vezi naše djece,
02:13
we're optimistic about our families,
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optimistični smo u vezi naših obitelji,
02:14
but we're not so optimistic about the guy sitting next to us,
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ali nismo toliko optimistični kada se radi o drugima,
02:18
and we're somewhat pessimistic
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i donekle smo pesimistični
02:20
about the fate of our fellow citizens and the fate of our country.
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kada se radi o sudbini naših sugrađana i sudbini naše države.
02:24
But private optimism about our own personal future
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No privatni optimizam o našoj osobnoj budućnosti
02:28
remains persistent.
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ostaje trajan.
02:30
And it doesn't mean that we think things will magically turn out okay,
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To ne znači kako mislimo da će se stvari magično posložiti,
02:34
but rather that we have the unique ability to make it so.
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već da imamo jedinstvenu sposobnost da to ostvarimo.
02:38
Now I'm a scientist, I do experiments.
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Ja sam znanstvenica i provodim pokuse.
02:41
So to show you what I mean,
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Kako bih vam pokazala o čemu govorim,
02:43
I'm going to do an experiment here with you.
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provest ću jedan pokus s vama.
02:45
So I'm going to give you a list of abilities and characteristics,
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Dat ću vam popis vještina i karakteristika
02:49
and I want you to think for each of these abilities
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i želim da za svaku od navedenih vještina promislite
02:52
where you stand relative to the rest of the population.
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gdje se nalazite u odnosu na ostatak populacije.
02:56
The first one is getting along well with others.
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Prva je slaganje s drugim ljudima.
03:00
Who here believes they're at the bottom 25 percent?
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Tko ovdje vjeruje da se nalazi u donjih 25 posto?
03:06
Okay, that's about 10 people out of 1,500.
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U redu, to je oko 10 ljudi od 1.500.
03:10
Who believes they're at the top 25 percent?
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Tko vjeruje da se nalazi u gornjih 25 posto?
03:14
That's most of us here.
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Većina nas.
03:17
Okay, now do the same for your driving ability.
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U redu, sad napravite isto za vašu vještinu vožnje.
03:22
How interesting are you?
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Koliko smatrate da ste zanimljivi?
03:24
How attractive are you?
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Koliko ste privlačni?
03:27
How honest are you?
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Koliko ste iskreni?
03:30
And finally, how modest are you?
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I naposljetku, koliko ste skromni?
03:35
So most of us put ourselves above average
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Dakle većina nas sebe svrstava iznad prosjeka
03:38
on most of these abilities.
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vezano za većinu navedenih vještina.
03:40
Now this is statistically impossible.
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To je statistički nemoguće.
03:42
We can't all be better than everyone else.
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Ne možemo svi biti bolji od svih drugih.
03:45
(Laughter)
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(Smijeh)
03:47
But if we believe we're better than the other guy,
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No ako vjerujemo da smo bolji od onog drugog
03:50
well that means that we're more likely to get that promotion, to remain married,
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to znači da imamo veću vjerojatnost da dobijemo promaknuće, da ostanemo u braku,
03:54
because we're more social, more interesting.
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jer smo društveniji i zanimljiviji.
03:56
And it's a global phenomenon.
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Ovo je globalni fenomen.
03:58
The optimism bias has been observed
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Sklonost optimizmu je primjećena
04:01
in many different countries --
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u mnogim zemljama --
04:03
in Western cultures, in non-Western cultures,
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u zapadnim kulturama, u ne-zapadnim kulturama,
04:06
in females and males,
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kod žena i kod muškaraca,
04:07
in kids, in the elderly.
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kod djece i starijih.
04:09
It's quite widespread.
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Poprilično je raširena.
04:11
But the question is, is it good for us?
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No pitanje je, je li to dobro za nas?
04:14
So some people say no.
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Neki kažu da nije.
04:17
Some people say the secret to happiness
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Neki kažu da se tajna sreće nalazi
04:19
is low expectations.
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u niskim očekivanjima.
04:22
I think the logic goes something like this:
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Mislim da je logika iza toga otprilike ova:
04:25
If we don't expect greatness,
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Ako ne očekujemo velike stvari,
04:27
if we don't expect to find love and be healthy and successful,
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ako ne očekujemo da ćemo pronaći ljubav i biti zdravi i uspješni,
04:31
well we're not going to be disappointed when these things don't happen.
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onda nećemo biti razočarani kada se te stvari ne dogode.
04:34
And if we're not disappointed when good things don't happen,
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Ako nismo razočarani kada se dobre stvari ne dogode,
04:37
and we're pleasantly surprised when they do,
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a ugodno smo iznenađeni kada se dogode,
04:39
we will be happy.
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bit ćemo sretni.
04:41
So it's a very good theory,
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Ovo je jako dobra teorija,
04:43
but it turns out to be wrong for three reasons.
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ali ispostavlja se kako je pogrešna iz tri razloga.
04:46
Number one: Whatever happens, whether you succeed or you fail,
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Prvi razlog: što god se dogodi, bilo da uspijete ili podbacite,
04:50
people with high expectations always feel better.
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osobe s visokim očekivanjima se uvijek osjećaju bolje.
04:54
Because how we feel when we get dumped or win employee of the month
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To je zato što naši osjećaji kada nas partner ostavi ili kada postanemo zaposlenik mjeseca
04:58
depends on how we interpret that event.
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ovise o tome kako tumačimo taj događaj.
05:01
The psychologists Margaret Marshall and John Brown
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Psiholozi Margaret Marshall i John Brown
05:05
studied students with high and low expectations.
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su proučavali studente s visokim i niskim očekivanjima.
05:08
And they found that when people with high expectations succeed,
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I utvrdili su da kada ljudi s visokim očekivanjima postignu uspjeh,
05:12
they attribute that success to their own traits.
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oni taj uspjeh pripisuju vlastitim osobinama.
05:15
"I'm a genius, therefore I got an A,
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"Ja sam genije i zato sam dobio peticu
05:17
therefore I'll get an A again and again in the future."
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i zato ću nastaviti dobijati petice i ubuduće."
05:20
When they failed, it wasn't because they were dumb,
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Kada bi doživjeli neuspjeh, to nije bilo zato što su glupi,
05:23
but because the exam just happened to be unfair.
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već zato što je ispit taj put bio nepravedan.
05:26
Next time they will do better.
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Idući put će biti bolje.
05:29
People with low expectations do the opposite.
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Ljudi s niskim očekivanjima čine suprotno.
05:32
So when they failed it was because they were dumb,
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Tako da kada oni dožive neuspjeh to je zato što su glupi,
05:34
and when they succeeded
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a kada postignu uspjeh
05:36
it was because the exam just happened to be really easy.
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to je zato što je ispit taj put bio uistinu lagan.
05:39
Next time reality would catch up with them.
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Idući put će ih stvarnost sustići.
05:42
So they felt worse.
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Stoga se osjećaju lošije.
05:44
Number two: Regardless of the outcome,
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Drugi razlog: bez obzira na ishod,
05:47
the pure act of anticipation makes us happy.
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sam čin iščekivanja nas čini sretnima.
05:51
The behavioral economist George Lowenstein
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Bihevioralni ekonomist George Lowenstein
05:54
asked students in his university
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je zamolio studente sa svog sveučilišta
05:56
to imagine getting a passionate kiss from a celebrity, any celebrity.
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da zamisle strastveni poljubac s bilo kojom slavnom osobom.
06:00
Then he said, "How much are you willing to pay
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Zatim ih je pitao: "Koliko ste voljni platiti
06:03
to get a kiss from a celebrity
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za poljubac slavne osobe
06:05
if the kiss was delivered immediately,
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ako će vas poljubiti odmah,
06:07
in three hours, in 24 hours, in three days,
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za tri sata, za 24 sata, za tri dana,
06:12
in one year, in 10 years?
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za godinu dana ili za 10 godina?
06:15
He found that the students were willing to pay the most
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Otkrio je da su studenti najspremniji najviše platiti
06:18
not to get a kiss immediately,
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za poljubac koji neće dobiti odmah,
06:20
but to get a kiss in three days.
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već za tri dana.
06:23
They were willing to pay extra in order to wait.
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Bili su spremni platiti više da bi čekali.
06:27
Now they weren't willing to wait a year or 10 years;
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Nisu, doduše, bili spremni čekati godinu dana ili 10 godina;
06:30
no one wants an aging celebrity.
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nitko ne želi ostarjelu zvijezdu.
06:32
But three days seemed to be the optimum amount.
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No tri dana se činilo idealnim razdobljem.
06:36
So why is that?
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Zašto je tako?
06:39
Well if you get the kiss now, it's over and done with.
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Zato što ako dobijete poljubac odmah, on je već povijest.
06:42
But if you get the kiss in three days,
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No ako dobijete poljubac za tri dana,
06:44
well that's three days of jittery anticipation, the thrill of the wait.
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onda ćete provesti tri dana u slatkom i uzbudljivom iščekivanju.
06:48
The students wanted that time
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Studenti su željeli to vrijeme
06:50
to imagine where is it going to happen,
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kako bi zamišljali gdje će se to dogoditi
06:52
how is it going to happen.
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i kako će se dogoditi.
06:54
Anticipation made them happy.
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Iščekivanje ih je činilo sretnima.
06:56
This is, by the way, why people prefer Friday to Sunday.
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Ovo je, usput rečeno, razlog zašto ljudi više vole petak nego nedjelju.
07:00
It's a really curious fact,
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To je uistinu neobična činjenica
07:02
because Friday is a day of work and Sunday is a day of pleasure,
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s obzirom da je petak radni dan dok je nedjelja dan odmora
07:06
so you'd assume that people will prefer Sunday,
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pa biste pretpostavili da ljudi više vole nedjelju.
07:09
but they don't.
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No nije tako.
07:10
It's not because they really, really like being in the office
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Ne zato što stvarno vole biti u uredu
07:13
and they can't stand strolling in the park
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i ne podnose šetnje parkom
07:15
or having a lazy brunch.
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ili kasne doručke.
07:17
We know that, because when you ask people
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To znamo zato što kad upitate ljude
07:19
about their ultimate favorite day of the week,
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koji im je najdraži dan u tjednu,
07:22
surprise, surprise, Saturday comes in at first,
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gle čuda, subota je na prvom mjestu,
07:24
then Friday, then Sunday.
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zatim petak pa onda nedjelja.
07:27
People prefer Friday
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Ljudi više vole petak
07:29
because Friday brings with it the anticipation of the weekend ahead,
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zato što petak uključuje iščekivanje predstojećeg vikenda
07:33
all the plans that you have.
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i svih planova za vikend.
07:35
On Sunday, the only thing you can look forward to
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Jedina stvar kojoj se možete radovati nedjeljom
07:38
is the work week.
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je radni dan.
07:40
So optimists are people who expect more kisses in their future,
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Optimisti su dakle ljudi koji očekuju više poljubaca u budućnosti
07:45
more strolls in the park.
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i više šetnji parkom.
07:47
And that anticipation enhances their wellbeing.
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I to iščekivanje pojačava njihovo zadovoljstvo.
07:51
In fact, without the optimism bias,
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Zapravo bismo, bez sklonosti optimizmu,
07:54
we would all be slightly depressed.
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svi mi bili blago depresivni.
07:57
People with mild depression,
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Osobe s blagom depresijom
07:59
they don't have a bias when they look into the future.
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nemaju sklonost optimizmu kada razmišljaju o budućnosti.
08:02
They're actually more realistic than healthy individuals.
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Oni su zapravo realniji od zdravih pojedinaca.
08:06
But individuals with severe depression,
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No pojedinci koji pate od ozbiljne depresije
08:08
they have a pessimistic bias.
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imaju sklonost pesimizmu.
08:10
So they tend to expect the future
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Stoga zamišljaju da će budućnost
08:12
to be worse than it ends up being.
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biti lošija no što na kraju stvarno ispadne.
08:15
So optimism changes subjective reality.
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Dakle optimizam mijenja subjektivnu stvarnost.
08:18
The way we expect the world to be changes the way we see it.
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Naša očekivanja kako će svijet izgledati mijenjaju način na koji ga promatramo.
08:22
But it also changes objective reality.
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No također mijenjaju i objektivnu stvarnost.
08:25
It acts as a self-fulfilling prophecy.
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Ona djeluju kao samoispunjavajuće proročanstvo.
08:28
And that is the third reason
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I to je treći razlog
08:30
why lowering your expectations will not make you happy.
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zašto vas smanjivanje očekivanja neće usrećiti.
08:33
Controlled experiments have shown
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Kontrolirani pokusi su pokazali
08:35
that optimism is not only related to success,
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da optimizam nije samo povezan s uspjehom,
08:38
it leads to success.
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već i da vodi uspjehu.
08:40
Optimism leads to success in academia and sports and politics.
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Optimizam vodi uspjehu u akademskoj zajednici i sportu i politici.
08:44
And maybe the most surprising benefit of optimism is health.
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Jedna od koristi optimizma koja možda najviše začuđuje, jest zdravlje.
08:49
If we expect the future to be bright,
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Ako očekujemo da će budućnost biti svijetla,
08:52
stress and anxiety are reduced.
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stres i tjeskoba se smanjuju.
08:55
So all in all, optimism has lots of benefits.
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Tako da sve u svemu, optimizam ima puno prednosti.
08:59
But the question that was really confusing to me was,
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No ono što me uistinu zbunjivalo
09:02
how do we maintain optimism in the face of reality?
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jest pitanje kako zadržavamo optimizam kad smo suočeni sa stvarnošću?
09:07
As an neuroscientist, this was especially confusing,
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Kao neuroznanstveniku, ovo je bilo posebno zbunjujuće
09:10
because according to all the theories out there,
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je, prema svim raspoloživim teorijama,
09:13
when your expectations are not met, you should alter them.
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kada očekivanja nisu ispunjena, trebali bismo ih promijeniti.
09:17
But this is not what we find.
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No to nije ono što smo otkrili.
09:19
We asked people to come into our lab
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Zamolili smo ljude da dođu u naš laboratorij
09:22
in order to try and figure out what was going on.
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kako bismo pokušali shvatiti što se događa.
09:25
We asked them to estimate their likelihood
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Zamolili smo ih da procjene vjerojatnost
09:27
of experiencing different terrible events in their lives.
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da će im se dogoditi različiti užasni događaji.
09:30
So, for example, what is your likelihood of suffering from cancer?
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Pitali smo ih primjerice koja je vjerojatnost da će oboljeti od raka.
09:34
And then we told them the average likelihood
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A zatim smo im rekli koja je prosječna vjerojatnost
09:37
of someone like them to suffer these misfortunes.
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za osobe poput njih da će im se dogoditi ovakve nedaće.
09:40
So cancer, for example, is about 30 percent.
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Primjerice, vjerojatnost oboljenja od raka je 30 posto.
09:43
And then we asked them again,
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Zatim smo ih ponovo pitali:
09:46
"How likely are you to suffer from cancer?"
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"Kolika je vjerojatnost da ćete oboljeti od raka?"
09:49
What we wanted to know was
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Željeli smo saznati
09:51
whether people will take the information that we gave them
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hoće li ljudi upotrijebiti informaciju koju smo im dali
09:54
to change their beliefs.
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da promjene svoja uvjerenja.
09:56
And indeed they did --
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I uistinu su to učinili --
09:58
but mostly when the information we gave them
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no uglavnom onda kada je informacija koju smo im dali
10:01
was better than what they expected.
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bila bolja od onog što su očekivali.
10:04
So for example,
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Tako, na primjer,
10:05
if someone said, "My likelihood of suffering from cancer
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ako je osoba rekla: "Vjerojatnost da ću oboljeti od raka
10:08
is about 50 percent,"
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je oko 50 posto.",
10:10
and we said, "Hey, good news.
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nakon čega smo mi rekli: "Čuj, imamo dobre vijesti,
10:13
The average likelihood is only 30 percent,"
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vjerojatnost je samo 30 posto.",
10:16
the next time around they would say,
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u idućem krugu bi rekli:
10:18
"Well maybe my likelihood is about 35 percent."
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"Mislim da je moja vjerojatnost oko 35 posto."
10:20
So they learned quickly and efficiently.
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Dakle učili su brzo i učinkovito.
10:23
But if someone started off saying,
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No ako je osoba prvotno rekla:
10:26
"My average likelihood of suffering from cancer is about 10 percent,"
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"Moja vjerojatnost da ću oboljeti od raka je oko 10 posto",
10:29
and we said, "Hey, bad news.
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nakon čega smo mi rekli: "Čuj, imamo loše vijesti,
10:32
The average likelihood is about 30 percent,"
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prosječna vjerojatnost je oko 30 posto",
10:35
the next time around they would say,
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u idućem krugu bi rekli:
10:37
"Yep. Still think it's about 11 percent."
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"Da. Još uvijek mislim da je oko 11 posto."
10:40
(Laughter)
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(Smijeh)
10:42
So it's not that they didn't learn at all -- they did --
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Tako da nije da nisu uopće naučili, jesu,
10:45
but much, much less than when we gave them
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ali su naučili puno, puno manje nego kad smo im dali
10:47
positive information about the future.
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pozitivne informacije o budućnosti.
10:50
And it's not that they didn't remember the numbers that we gave them;
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I nije da nisu zapamtili brojke koje smo im naveli.
10:53
everyone remembers that the average likelihood of cancer
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Svi su zapamtili da je prosječna vjerojatnost oboljenja od raka
10:56
is about 30 percent
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oko 30 posto
10:57
and the average likelihood of divorce is about 40 percent.
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i da je prosječna vjerojatnost za razvod oko 40 posto.
11:00
But they didn't think that those numbers were related to them.
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No nisu smatrali da se te brojke odnose na njih.
11:05
What this means is that warning signs such as these
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To znači da upozorenja kao primjerice da pušenje ubija,
11:09
may only have limited impact.
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mogu imati samo ograničeni učinak.
11:12
Yes, smoking kills, but mostly it kills the other guy.
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Jasno je, pušenje ubija, ali nekog drugog.
11:16
What I wanted to know was
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Ono što sam željela saznati je bilo
11:18
what was going on inside the human brain
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što se događa u ljudskom mozgu
11:21
that prevented us from taking these warning signs personally.
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što nas sprječava da ovakva upozorenja shvatimo ozbiljno.
11:25
But at the same time,
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Istovremeno,
11:26
when we hear that the housing market is hopeful,
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kada čujemo da situacija na tržištu nekretnina ide na bolje
11:28
we think, "Oh, my house is definitely going to double in price."
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pomislimo: "Mojoj kući će se udvostručiti cijena."
11:32
To try and figure that out,
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2085
Kako bismo pokušali to shvatiti,
11:34
I asked the participants in the experiment
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zamolila sam sudionike pokusa
11:37
to lie in a brain imaging scanner.
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da legnu u skener za slikanje mozga.
11:39
It looks like this.
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On izgleda ovako.
11:41
And using a method called functional MRI,
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Koristeći metodu koja se naziva funkcionalna magnetska rezonancija
11:44
we were able to identify regions in the brain
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mogli smo identificirati područja u mozgu
11:47
that were responding to positive information.
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koja su reagirala na pozitivne informacije.
11:50
One of these regions is called the left inferior frontal gyrus.
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Jedno od tih područja se naziva lijeva donja frontalna vijuga.
11:54
So if someone said, "My likelihood of suffering from cancer is 50 percent,"
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Stoga ako je osoba rekla: "Moja vjerojatnost da ću oboljeti od raka je 50 posto",
11:57
and we said, "Hey, good news.
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na što bi mi rekli: "Čuj, dobre vijesti,
11:59
Average likelihood is 30 percent,"
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prosječna vjerojatnost je 30 posto.",
12:02
the left inferior frontal gyrus would respond fiercely.
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lijeva donja frontalna vijuga bi snažno reagirala.
12:05
And it didn't matter if you're an extreme optimist, a mild optimist
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I nije bilo važno jeste li krajnje optimistična, blago optimistična
12:10
or slightly pessimistic,
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ili lagano pesimistična osoba,
12:12
everyone's left inferior frontal gyrus
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svačija lijeva frontalna vijuga
12:14
was functioning perfectly well,
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je funkcionirala savršeno dobro,
12:16
whether you're Barack Obama or Woody Allen.
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bilo da ste Barack Obama ili Woody Allen.
12:19
On the other side of the brain,
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Na drugoj strani mozga,
12:21
the right inferior frontal gyrus was responding to bad news.
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desna donja frontalna vijuga je odgovarala na loše vijesti.
12:25
And here's the thing: it wasn't doing a very good job.
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I evo u čemu je stvar: nije baš dobro obavljala svoj zadatak.
12:29
The more optimistic you were,
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2015
Što ste bili optmističniji,
12:31
the less likely this region was
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manje je bilo vjerojatno da će ovo područje
12:34
to respond to unexpected negative information.
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reagirati na neočekivane negativne informacije.
12:37
And if your brain is failing
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Ako vaš mozak ne uspijeva
12:40
at integrating bad news about the future,
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3225
integrirati loše vijesti o budućnosti,
12:43
you will constantly leave your rose-tinted spectacles on.
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vi ćete neprekidno gledati kroz ružičaste naočale.
12:47
So we wanted to know, could we change this?
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Stoga smo željeli saznati možemo li ovo promijeniti.
12:52
Could we alter people's optimism bias
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Možemo li izmjeniti ljudsku sklonost optimizmu
12:56
by interfering with the brain activity in these regions?
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utječući na moždanu aktivnost u ovim područjima mozga.
13:00
And there's a way for us to do that.
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I postoji način da to i učinimo.
13:02
This is my collaborator Ryota Kanai.
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Ovo je moj suradnik Ryota Kanai.
13:05
And what he's doing is he's passing a small magnetic pulse
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On propušta mali magnetski impuls
13:09
through the skull of the participant in our study
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kroz sudionikovu lubanju
13:11
into their inferior frontal gyrus.
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u njegove donje frontalne vijuge.
13:13
And by doing that,
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Čineći to,
13:15
he's interfering with the activity of this brain region
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on utječe na aktivnost ovog područja u mozgu
13:18
for about half an hour.
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na otprilike pola sata.
13:19
After that everything goes back to normal, I assure you.
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Nakon toga se, uvjeravam vas, sve vraća u normalu.
13:22
(Laughter)
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1993
(Smijeh)
13:24
So let's see what happens.
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Da vidimo što se događa.
13:27
First of all, I'm going to show you
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Prvo ću vam pokazati
13:30
the average amount of bias that we see.
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prosječnu količinu pristranosti koju vidimo.
13:32
So if I was to test all of you now,
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Kada bih sve vas ovdje testirala,
13:35
this is the amount that you would learn
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ovo je koliko više biste naučili
13:37
more from good news relative to bad news.
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iz dobrih vijesti u odnosu na loše vijesti.
13:40
Now we interfere with the region
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Kada utječemo na područje
13:42
that we found to integrate negative information in this task,
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za koje smo utvrdili da integrira negativne informacije u ovom zadatku,
13:47
and the optimism bias grew even larger.
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sklonost optmizmu je još više porasla.
13:50
We made people more biased in the way that they process information.
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Učinili smo ljude još pristranijima u načinu na koji su obrađivali informacije.
13:56
Then we interfered with the brain region
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Zatim smo utjecali na područje u mozgu
13:59
that we found to integrate good news in this task,
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za koje smo utvrdili da integrira dobre vijesti u ovom zadatku
14:02
and the optimism bias disappeared.
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i sklonost optimizmu je nestala.
14:07
We were quite amazed by these results
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2008
Bili smo zapanjeni ovim rezultatima
14:09
because we were able to eliminate
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jer smo uspjeli otkloniti
14:11
a deep-rooted bias in humans.
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duboko ukorijenjenu sklonost kod ljudi.
14:14
And at this point we stopped and we asked ourselves,
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U tom trenutku smo se zapitali
14:19
would we want to shatter the optimism illusion into tiny little bits?
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želimo li razbiti iluziju optimizma u malene komadiće?
14:24
If we could do that, would we want to take people's optimism bias away?
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5044
Kada bismo to mogli učiniti, želimo li ljudima oduzeti njihovu sklonost optimizmu?
14:29
Well I've already told you about all of the benefits of the optimism bias,
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Već smo vam govorili o svim dobrobitima sklonosti optimizmu
14:34
which probably makes you want to hold onto it for dear life.
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zbog kojih je želite zadržati po svaku cijenu.
14:38
But there are, of course, pitfalls,
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No, naravno, postoje zamke
14:40
and it would be really foolish of us to ignore them.
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koje bi bilo blesavo ignorirati.
14:43
Take for example this email I recieved
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Uzmite na primjer ovu e-poštu koju sam primila
14:47
from a firefighter here in California.
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od vatrogasca iz Kalifornije.
14:49
He says, "Fatality investigations for firefighters
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On kaže: "Istrage smrtonosnih ozljeda u radu vatrogasaca
14:53
often include 'We didn't think the fire was going to do that,'
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4142
često uključuju objašnjenja poput 'Nismo mislili da će vatra to učiniti',
14:57
even when all of the available information
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2302
čak i kada su postojale sve raspoložive informacije
14:59
was there to make safe decisions."
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2255
za donošenje sigurnih odluka."
15:01
This captain is going to use our findings on the optimism bias
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3874
Ovaj vatrogasni zapovjednik će iskoristiti rezultate našeg istraživanja o sklonosti optimizmu
15:05
to try to explain to the firefighters
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kako bi pokušao objasniti vatrogascima
15:08
why they think the way they do,
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zašto razmišljaju na način na koji razmišljaju
15:10
to make them acutely aware of this very optimistic bias in humans.
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s ciljem osvješćivanja o sklonosti optmizmu kod ljudi.
15:17
So unrealistic optimism can lead to risky behavior,
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5119
Nerealni optimizam vodi u rizično ponašanje,
15:22
to financial collapse, to faulty planning.
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financijski kolaps, pogrešno planiranje.
15:26
The British government, for example,
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Britanska vlada je, primjerice,
15:28
has acknowledged that the optimism bias
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2674
prepoznala da sklonost optimizmu
15:30
can make individuals more likely
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može pojedince navesti
15:34
to underestimate the costs and durations of projects.
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4026
da podcijene troškove i trajanje projekata.
15:38
So they have adjusted the 2012 Olympic budget
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4254
Stoga su budžet za Olimpijske igre 2012. godine prilagodili
15:42
for the optimism bias.
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2111
sklonosti optimizmu.
15:44
My friend who's getting married in a few weeks
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2187
Moj prijatelj koji se ženi za nekoliko tjedana
15:46
has done the same for his wedding budget.
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je isto učinio za svoj budžet za vjenčanje.
15:49
And by the way, when I asked him about his own likelihood of divorce,
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3062
Usput, kad sam ga pitala koja je vjerojatnost da će se razvesti
15:52
he said he was quite sure it was zero percent.
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rekao je kako je prilično siguran da je to, nula posto.
15:55
So what we would really like to do,
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Ono što bismo stvarno željeli učiniti
15:58
is we would like to protect ourselves from the dangers of optimism,
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je zaštititi same sebe od opasnosti optimizma,
16:02
but at the same time remain hopeful,
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no u isto vrijeme ostati puni nade,
16:05
benefiting from the many fruits of optimism.
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2844
uživajući pogodnosti optimizma.
16:08
And I believe there's a way for us to do that.
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Ja vjerujem da postoji način da to učinimo.
16:11
The key here really is knowledge.
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Ključ je u znanju.
16:13
We're not born with an innate understanding of our biases.
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Ne rađamo se s urođenim razumijevanjem naših sklonosti.
16:16
These have to be identified by scientific investigation.
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One se moraju utvrditi znanstvenim istraživanjem.
16:20
But the good news is that becoming aware of the optimism bias
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No dobra vijest je osvješćivanje postojanja sklonosti optimizmu
16:24
does not shatter the illusion.
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ne uništava iluziju.
16:26
It's like visual illusions,
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1548
Isto je kao i s vizualnim iluzijama
16:28
in which understanding them does not make them go away.
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u kojima njihovo razumijevanje ne uzrokuje njihovo nestajanje.
16:31
And this is good because it means
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2237
To je dobro jer znači
16:33
we should be able to strike a balance,
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2473
da bismo trebali moći naći ravnotežu,
16:36
to come up with plans and rules
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2427
smisliti planove i pravila
16:38
to protect ourselves from unrealistic optimism,
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2783
kojima ćemo se zaštititi od nerealnog optimizma,
16:41
but at the same time remain hopeful.
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a u isto vrijeme zadržati nadu.
16:44
I think this cartoon portrays it nicely.
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Mislim da ovaj crtež to dobro oslikava.
16:48
Because if you're one of these pessimistic penguins up there
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3526
Ako ste jedan od ovih pesimističnih pingvina,
16:51
who just does not believe they can fly,
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2119
koji jednostavno ne vjeruju da mogu poletjeti,
16:53
you certainly never will.
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sigurno ni nećete poletjeti.
16:56
Because to make any kind of progress,
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1831
Da bismo ostvarili bilo kakav napredak
16:57
we need to be able to imagine a different reality,
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moramo moći zamisliti drugačiju stvarnost,
17:00
and then we need to believe that that reality is possible.
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a zatim moramo vjerovati da je ta stvarnost uistinu moguća.
17:03
But if you are an extreme optimistic penguin
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No ako ste pretjerano optmistični pingvin
17:07
who just jumps down blindly hoping for the best,
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koji samo skoči bez razmišljanja nadajući se najboljem,
17:10
you might find yourself in a bit of a mess when you hit the ground.
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mogli bi se naći u problemu kada udarite o tlo.
17:15
But if you're an optimistic penguin
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No ako ste optmističan pingvin
17:16
who believes they can fly,
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koji vjeruje da može letjeti,
17:18
but then adjusts a parachute to your back
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no koji priveže padobran za leđa
17:21
just in case things don't work out exactly as you had planned,
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za slučaj da stvari ne ispadnu onako kako ste planirali,
17:24
you will soar like an eagle,
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letjet ćete poput orla,
17:26
even if you're just a penguin.
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čak i ako ste samo pingvin.
17:29
Thank you.
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Hvala vam.
17:31
(Applause)
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(Pljesak)

Original video on YouTube.com
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