Moral behavior in animals - Frans de Waal

[Music] [Music] [Applause] I was born in then Boss, where the painter Hieronymus Bosch named himself after. And so I've always been very fond of this painter who lived and worked in the 15th century.

What is interesting about him in relation to morality is he lived at a time where religious influence was waning, and he was sort of wondering, I think, what would happen with society if there was no religion or if there was less religion. And so he painted this famous painting The Garden of Earthly Delights, which some have interpreted as being humanity before the fall or being humanity without any fall at all.

And so it makes you wonder what would happen if we hadn't tasted the fruit of knowledge, so to speak, and what kind of morality we would have. Much later, as a student, I went to a very different garden: a tropical garden in Aram, where we keep chimpanzees.

This is me at an early age with a baby chimpanzee, and I discovered there that the chimpanzee are very power-hungry and wrote a book about it. At that time, the focus in a lot of animal research was on aggression and competition, and actually the whole picture of the animal kingdom, and humanity included, was that deep down we are competitors, we are aggressive, we are all out for our own profit, basically.

Basically, this is the launch of my book. I'm not sure how well the chimpanzees read it, but they surely seemed interested in the book. Now, in the process of doing all this work on power and dominance and aggression, I discovered that chimpanzees reconcile after fights.

What you see here is two males who have had a fight; they ended up in a tree, and one of them holds out a hand to the other. About a second after I took the picture, they came together in the fork of the tree and they kissed and embraced each other.

Now, this is very interesting because at the time, everything was about competition and aggression, and so it wouldn't make any sense. The only thing that matters is that you win or that you lose, but why would you reconcile after a fight? That doesn't make any sense.

This is the way bonobos do it; bonobos do everything with sex, and so they also reconcile with sex. But the principle is exactly the same: the principle is that you have a valuable relationship that is damaged by conflict, so you need to do something about it.

And so my whole picture of the animal kingdom, including humans, also started to change at that time. So we have this image in political science, economics, and humanity's philosophy for that matter, that man is a wolf to man, and so deep down our nature is actually nasty.

I think it's a very unfair image for the wolf. The wolf is, after all, a very cooperative animal, and that's why many of you have a dog at home, which has all these characteristics also. And it's very unfair to humanity because humanity is actually much more cooperative and empathic than they’re given credit for.

And so I started getting interested in those issues and studying that in other animals. These are the pillars of morality: if you ask anyone what is morality based on, these are the two factors that always come out. One is reciprocity, and associated with it is a sense of justice and a sense of fairness; and the other one is empathy and compassion.

Human morality is more than this, but if you would remove these two pillars, there wouldn't be much remaining, I think, and so they're absolutely essential. So let me give you a few examples here.

This is a very old video from the Yorkish Primary Center where they train chimpanzees to cooperate. So this is already about 100 years ago that we were doing experiments on cooperation. What you have here is two young chimpanzees who have a box, and the box is too heavy for one chimp to pull in.

Of course, there's food on the box; otherwise, they wouldn't be pulling so hard. And so they're bringing in the box, and you can see that they're synchronized. You can see that they work together; they pull at the same moment. It's already a big advance over many other animals who wouldn't be able to do that.

Now you're going to get a more interesting picture because now one of the two chimps has been fed, so one of the two is not really interested in the task anymore. [Laughter] [Laughter] Now look at what happens at the very end of this.

He takes basically everything. So, there are two interesting parts about this: one is that the chimp on the right has a full understanding; he needs the partner. So full understanding of the need for cooperation. The second one is that the partner is willing to work even though he's not interested in the food.

Why would that be? Well, that probably has to do with reciprocity. There is actually a lot of evidence in primates and other animals that they return favors, and so he will get a return favor at some point in the future. And so that's how this all operates.

We do the same task with elephants. Now, with elephants, it's very dangerous to work with elephants. And another problem with elephants is that you cannot make an apparatus that is too heavy for a single elephant. Now, you can probably make it, but it's going to be a pretty clumsy apparatus, I think.

So what we did in their case is we do these studies in Thailand with Josh Plotnik. We have an apparatus around which there's a rope, a single rope, and if you pull on this side of the rope, the rope disappears on the other side. So two elephants need to pick it up at exactly the same time and pull; otherwise, nothing is going to happen, and the rope disappears.

The first tape you're going to see is two elephants who are released together, arriving at the apparatus. The apparatus is on the left with food on it, and so they come together; they arrive together, they pick it up together, and they pull together. So it's actually fairly simple for them. There they are, and so that's how they bring it in.

But now we're going to make it more difficult because the whole purpose of this experiment is to see how well they understand cooperation. Do they understand it as well as the chimps, for example? So what we do in the next step is we release one elephant before the other, and that elephant needs to be smart enough to stay there and wait and not pull the rope because if you pull at the rope, it disappears and the whole test is over.

Now this elephant does something illegal that we did not teach it, but it shows the understanding that he has because he puts his big foot on the rope, stands on the rope, and waits there for the other. Then the other is going to do all the work for him. It’s what we call freeloading, but it shows the intelligence that the elephants had.

They developed several of these alternative techniques that we did not approve of necessarily. So the other elephant is now coming, and it's going to pull it in. Now look at the other; the other doesn't forget to eat, of course. This was the cooperation reciprocity part.

Now something on empathy; empathy is my main topic at the moment of research. Empathy has sort of two qualities. One is the understanding part of it: this is just a regular definition—the ability to understand and share the feelings of another—and the emotional part.

So, empathy has basically two channels. One is the body channel: if you talk with a sad person, you're going to adopt a sad expression and a sad posture, and before you know it, you feel sad. That's sort of the body channel of emotion empathy, which many animals have. Your average dog has that also; that's actually why people keep mammals in the home and not turtles or snakes or something like that, who don't have that kind of empathy.

Then there's a cognitive channel, which is more that you can take the perspective of somebody else, and that's more limited. There are few animals; I think elephants and apes can do that kind of thing, but there are very few animals who can do that.

Synchronization, which is part of that whole empathy mechanism, is a very old one in the animal kingdom. In humans, of course, we can study that with yawn contagion. Humans yawn when others yawn, and it's related to empathy; it activates the same areas in the brain.

Also, we know that people who have a lot of yawn contagion are highly empathic. People who have problems with empathy, such as autistic children, don't have yawn contagion. So it is connected, and we study that in our chimpanzees by presenting them with an animated head.

So, that's what you see on the upper left: an animated head that yawns, and there's a chimpanzee watching—an actual real chimpanzee watching a computer screen on which we play the animations. Yawn contagion, that you're probably all familiar with, and maybe you're going to start yawning soon now, is something that we share with other animals, and that's related to that whole body channel of synchronization that underlies empathy, and that is universal in mammals, basically.

Now we also study more complex expressions. This is consolation; this is a male chimp who was lost in a fight, and he's screaming. A juvenile comes over and puts an arm around him and calms him down. That's consolation. It's very similar to human consolation, and consolation behavior is empathy-driven.

That's actually the way they study empathy in human children: to instruct a family member to act distressed, and then they see what young children do. So it is related to empathy, and that's the kind of expressions we look at.

We also recently published an experiment. You may have heard about it on altruism in chimpanzees, where the question is: do chimpanzees care about the welfare of somebody else? For decades it had been assumed that only humans can do that; only humans worry about the welfare of somebody else.

Now we did a very simple experiment; we do this on chimpanzees that live in Lawrenceville in the field station of Yuris. So that's how they live. We call them into a room and do experiments with them. In this case, we put two chimpanzees side by side, and one has a bucket full of tokens, and the tokens have different meanings.

One kind of token feeds only the partner who chooses; the other one feeds both of them. This is a study we did with Vicky Horer, and here you have the two-color tokens. They have a whole bucket full of them, and they have to pick one of the two colors.

You will see how that goes. So if this chimp makes the selfish choice, which is the red token in this case, needs to give it to us; we pick it up, we put it on the table where there are two food rewards. But in this case, only the one on the right gets food, and the one on the left walks away because she knows already that this is not a good test for her.

Then the next one is the pro-social token, so the one who makes the choices—that's the interesting part here for the one who makes the choices—it doesn't really matter. So she gives us now a pro-social token, and both chimps get fed.

So the one who makes the choice always gets a reward, so it doesn't matter whatsoever. She should actually be choosing blindly, but what we find is that they prefer the pro-social token. So this is the 50% line; that's the random expectation. And especially if the partner draws attention to itself, they choose more, and if the partner puts pressure on them—so if the partner starts spitting water and intimidating them—then these choices go down.

They actually don't want to. It's as if they're saying, "If you're not behaving, I'm not going to be pro-social today." And this is what happens without a partner when there's no partner sitting there.

We found that the chimpanzees do care about the well-being of somebody else, especially other members of their own group.

So the final experiment that I want to mention to you is our fairness study. This became a very famous study, and there are now many more because after we did this about ten years ago, it became very well known. We did that originally with capuchin monkeys, and I'm going to show you the first experiment that we did.

It has now been done with dogs and with birds and with chimpanzees, but with SBR, we started out with capuchin monkeys. So what we did is we put two capuchin monkeys side by side again. These animals live in a group; they know each other. We take them out of the group, put them in a test chamber, and there's a very simple task that they need to do.

If you give both of them cucumber for the task, the two monkeys side by side, they're perfectly willing to do this 25 times in a row. So cucumber, even though it's really only water in my opinion, is perfectly fine for them.

Now, if you give the partner grapes, the food preferences of my capuchin monkeys correspond exactly with the prices in the supermarket. So if you give them grapes, that's a far better food; then you create inequity between them.

That's the experiment we did recently. We videotaped it with new monkeys who had never done the task, thinking that maybe they would have a stronger reaction, and that turned out to be right. The one on the left is the monkey who gets cucumber; the one on the right is the one who gets grapes.

The one who gets cucumber notices that the first piece of cucumber is perfectly fine. The first piece eats, and then she sees the other one getting grape, and you will see what happens.

She gives a rock to us; that's the task, and we give her a piece of cucumber, and she eats it. The other one needs to give a rock to us, and that's what she does, and she gets a grape, and she eats it. The other one sees that, she gives a rock to us, now gets again cucumber. [Laughter] [Applause] [Laughter]

She tests her rock now against the wall. She needs to give it to us, and she gets cucumber again. So this is basically the Wall Street protest that you see here.

Let me tell you—I still have two minutes left—let me tell you a funny story about this. This study became very famous, and we got a lot of comments from especially anthropologists, economists, and philosophers. They didn't like this at all because they had decided in their mind, I believe, that fairness is a very complex issue and that animals cannot have it.

And so one philosopher even wrote us that it was impossible for monkeys to have a sense of fairness because fairness was invented during the French Revolution. Now, another one wrote a whole chapter saying that he would believe it had something to do with fairness if the one who got grapes would refuse the grapes.

Now, the funny thing is that SRA Brosnan, who's been doing this with chimpanzees, had a couple of combinations of chimpanzees where indeed the one who would get the grape would refuse the grape until the other guy also got a grape.

So we're getting very close to the human sense of fairness, and I think philosophers need to rethink their philosophy for a while.

So let me summarize. I believe there's an evolved morality. I think morality is much more than what I've been talking about, but it would be impossible without these ingredients that we find in other primates, which are empathy and consolation, pro-social tendencies, reciprocity, and a sense of fairness.

And so we work on these particular issues to see if we can create a morality from the bottom up, so to speak, without necessarily God and religion involved, and to see how we can get to an evolved morality.

And I thank you for your attention. [Applause]