I'm actually interested in how the brain learns,

and I'm especially interested in a possibility of

making our brains smarter, better and faster.

This is in this context I'm going to tell you

about video games. When we say video games,

most of you think about children.

It's true. Ninety percent of children do play video games.

But let's be frank.

When the kids are in bed, who is in front of the PlayStation?

Most of you. The average age of a gamer is 33 years old,

not eight years old, and in fact, if we look

at the projected demographics of video game play,

the video game players of tomorrow are

older adults. (Laughter)

So video [gaming] is pervasive throughout our society.

It is clearly here to stay. It has an amazing impact

on our everyday life. Consider these statistics

released by Activision. After one month of release

of the game "Call Of Duty: Black Ops," it had been played

for 68,000 years

worldwide, right?

Would any of you complain if this was the case

about doing linear algebra?

So what we are asking in the lab is, how can we leverage that power?

Now I want to step back a bit.

I know most of you have had the experience of coming back

home and finding your kids playing these kinds of games.

(Shooting noises) The name of the game is to get

after your enemy zombie bad guys

before they get to you, right?

And I'm almost sure most of you have thought,

"Oh, come on, can't you do something more intelligent

than shooting at zombies?"

I'd like you to put this kind of knee-jerk reaction

in the context of what you would have thought

if you had found your girl playing sudoku

or your boy reading Shakespeare. Right?

Most parents would find that great.

Well, I'm not going to tell you that playing video games

days in and days out is actually good for your health.

It's not, and binging is never good.

But I'm going to argue that in reasonable doses,

actually the very game I showed you at the beginning,

those action-packed shooter games

have quite powerful effects and positive effects

on many different aspects of our behavior.

There's not one week that goes without some major

headlines in the media about whether video games are

good or bad for you, right? You're all bombarded with that.

I'd like to put this kind of Friday night bar discussion aside

and get you to actually step into the lab.

What we do in the lab is actually measure directly,

in a quantitative fashion, what is the impact

of video games on the brain.

And so I'm going to take a few examples from our work.

One first saying that I'm sure you all have heard

is the fact that too much screen time

makes your eyesight worse.

That's a statement about vision.

There may be vision scientists among you.

We actually know how to test that statement.

We can step into the lab and measure how good your vision is.

Well, guess what? People that don't play a lot

of action games, that don't actually spend a lot of time

in front of screens, have normal, or what we call

corrective-to-normal vision. That's okay.

The issue is what happens with these guys that actually

indulge into playing video games like five hours per week,

10 hours per week, 15 hours per week.

By that statement, their vision should be really bad, right?

Guess what? Their vision is really, really good.

It's better than those that don't play.

And it's better in two different ways.

The first way is that they're actually able to resolve

small detail in the context of clutter, and though that means

being able to read the fine print on a prescription

rather than using magnifier glasses, you can actually do it

with just your eyesight.

The other way that they are better is actually being able

to resolve different levels of gray.

Imagine you're driving in a fog. That makes a difference

between seeing the car in front of you

and avoiding the accident, or getting into an accident.

So we're actually leveraging that work to develop games

for patients with low vision, and to have an impact

on retraining their brain to see better.

Clearly, when it comes to action video games,

screen time doesn't make your eyesight worse.

Another saying that I'm sure you have all heard around:

Video games lead to attention problems and greater distractability.

Okay, we know how to measure attention in the lab.

I'm actually going to give you an example of how we do so.

I'm going to ask you to participate, so you're going to have

to actually play the game with me. I'm going to show you

colored words. I want you to shout out the color of the ink.

Right? So this is the first example.

["Chair"]

Orange, good. ["Table"] Green.

["Board"] Audience: Red.Daphne Bavelier: Red.

["Horse"] DB: Yellow. Audience: Yellow.

["Yellow"] DB: Red. Audience: Yellow.

["Blue"] DB: Yellow.

Okay, you get my point, right? (Laughter)

You're getting better, but it's hard. Why is it hard?

Because I introduced a conflict between

the word itself and its color.

How good your attention is determines actually how fast

you resolve that conflict, so the young guys here

at the top of their game probably, like, did a little better

than some of us that are older.

What we can show is that when you do this kind of task

with people that play a lot of action games,

they actually resolve the conflict faster.

So clearly playing those action games doesn't lead

to attention problems.

Actually, those action video game players have

many other advantages in terms of attention, and one

aspect of attention which is also improved for the better

is our ability to track objects around in the world.

This is something we use all the time. When you're driving,

you're tracking, keeping track of the cars around you.

You're also keeping track of the pedestrian, the running dog,

and that's how you can actually be safe driving, right?

In the lab, we get people to come to the lab,

sit in front of a computer screen, and we give them

little tasks that I'm going to get you to do again.

You're going to see yellow happy faces

and a few sad blue faces. These are children

in the schoolyard in Geneva during a recess

during the winter. Most kids are happy. It's actually recess.

But a few kids are sad and blue because they've forgotten their coat.

Everybody begins to move around, and your task

is to keep track of who had a coat at the beginning

and who didn't. So I'm just going to show you an example

where there is only one sad kid. It's easy because you can

actually track it with your eyes. You can track,

you can track, and then when it stops, and there is

a question mark, and I ask you, did this kid have a coat or not?

Was it yellow initially or blue?

I hear a few yellow. Good. So most of you have a brain. (Laughter)

I'm now going to ask you to do the task, but now with

a little more challenging task. There are going to be

three of them that are blue. Don't move your eyes.

Please don't move your eyes. Keep your eyes fixated

and expand, pull your attention. That's the only way

you can actually do it. If you move your eyes, you're doomed.

Yellow or blue?

Audience: Yellow.DB: Good.

So your typical normal young adult

can have a span of about three or four objects of attention.

That's what we just did. Your action video game player

has a span of about six to seven objects of attention,

which is what is shown in this video here.

That's for you guys, action video game players.

A bit more challenging, right? (Laughter)

Yellow or blue? Blue. We have some people

that are serious out there. Yeah. (Laughter)

Good. So in the same way that we actually see

the effects of video games on people's behavior,

we can use brain imaging and look at the impact

of video games on the brain, and we do find many changes,

but the main changes are actually to the brain networks

that control attention. So one part is the parietal cortex

which is very well known to control the orientation of attention.

The other one is the frontal lobe, which controls

how we sustain attention, and another one

is the anterior cingulate, which controls how we allocate

and regulate attention and resolve conflict.

Now, when we do brain imaging, we find that all three

of these networks are actually much more efficient

in people that play action games.

This actually leads me to a rather counterintuitive finding

in the literature about technology and the brain.

You all know about multitasking. You all have been faulty

of multitasking when you're driving

and you pick up your cellphone. Bad idea. Very bad idea.

Why? Because as your attention shifts to your cell phone,

you are actually losing the capacity to react swiftly

to the car braking in front of you, and so you're

much more likely to get engaged into a car accident.

Now, we can measure that kind of skills in the lab.

We obviously don't ask people to drive around and see

how many car accidents they have. That would be a little

costly proposition. But we design tasks on the computer

where we can measure, to millisecond accuracy,

how good they are at switching from one task to another.

When we do that, we actually find that people

that play a lot of action games are really, really good.

They switch really fast, very swiftly. They pay a very small cost.

Now I'd like you to remember that result, and put it

in the context of another group of technology users,

a group which is actually much revered by society,

which are people that engage in multimedia-tasking.

What is multimedia-tasking? It's the fact that most of us,

most of our children, are engaged with listening to music

at the same time as they're doing search on the web

at the same time as they're chatting on Facebook with their friends.

That's a multimedia-tasker.

There was a first study done by colleagues at Stanford

and that we replicated that showed that

those people that identify as being high multimedia-taskers

are absolutely abysmal at multitasking.

When we measure them in the lab, they're really bad.

Right? So these kinds of results really

makes two main points.

The first one is that not all media are created equal.

You can't compare the effect of multimedia-tasking

and the effect of playing action games. They have

totally different effects on different aspects of cognition,

perception and attention.

Even within video games, I'm telling you right now

about these action-packed video games.

Different video games have a different effect on your brains.

So we actually need to step into the lab and really measure

what is the effect of each video game.

The other lesson is that general wisdom carries no weight.

I showed that to you already, like we looked at the fact that

despite a lot of screen time, those action gamers

have a lot of very good vision, etc.

Here, what was really striking is that these undergraduates

that actually report engaging in a lot of high

multimedia-tasking are convinced they aced the test.

So you show them their data, you show them they are bad

and they're like, "Not possible." You know, they have

this sort of gut feeling that, really, they are doing really, really good.

That's another argument for why we need to step into the lab

and really measure the impact of technology on the brain.

Now in a sense, when we think about the effect