Steven Pinker (21:37)
Yeah. Once again, you've raised a number of, I think, really deep points. One of them is that we're all capable of rationality. And I take pains to avoid the impression that one can get, in reading the literature on human judgment and decision making, that humans are a bunch of boobs. We're saddled with these biases and fallacies. It's because we are just cavemen out of time. We have quick reactions so that we don't get eaten by leopards, and with the implication that it's only, you know, we psychologists, philosophers, statisticians that can make a claim to rationality. And I try to dispatch that idea early in the book with an extended discussion of the San people of the Kalahari Desert in South Africa and Botswana, formerly called the Bushmen, and how cerebral they are in hunting, how they have to engage in quite sophisticated reasoning in inferring what animal left behind, which tracks and where the animal is and what condition it's in, its sex, its age. All of which they do by a kind of scientific reasoning, at least I consider it to be deserving of that term, based on the work of Louis Liebenberg, who's lived with them for many decades. Likewise, when I reiterate some of the classic fallacies that anyone who's taken behavioral economics or cognitive psychology knows about the base rate, neglect the gambler's fallacy. I try to not just say, well, aren't we a stupid species? But rather, here is why. That mode of thinking actually is pretty useful in pretty narrow, circumscribed circumstances. It just can't scale, it can't generalize. And we're kind of trapping people into making these errors by hitting them with some circumstances, unlike one in which that mode of reasoning ordinarily works pretty well. And I distinguish between ecological rationality and formal rationality. It's a distinction I borrowed from Leda cosmodes and John Toobie and Gerd Gigerenzer, and it refers to the distinction between having the ability to reason that's kind of baked together with your subject matter knowledge. And it's very different from the kind of academic reasoning that we're taught to do in school, where you are given very general abstract rules with variables P and Q and A and B. Those are extremely useful. That's why we have education. It's not that people shouldn't know them, but in everyday life they often are inapplicable. And this becomes clear when you say, speak to people from a non literate, non educated culture, or for that matter, sometimes our own students, and you realize there is a kind of rationality to what they say, even though it doesn't fit with the application of formal rules. Let me just give you an example. This comes from the work of the great Russian psychologist Luria, who interviewed Russian peasants. He asked some questions, he gave them problems like this. All animals in Siberia are white. Are the bears white? And the peasant says, well, how should I know? I've never been to Siberia. And he said, well, I just said all animals are white. And he says, well, that's not the kind of thing that you can figure out just by words. You got to see them. So he's making a distinction between what philosophers call analytic versus synthetic or theoretical versus empirical knowledge. Mainly. There's some things you can't deduce. They're not like Pythagorean theorem. You have to be an empiricist. You got to look. But that would be an incorrect answer in a logic puzzle in one of our. In our schools, because we learn the habit of forgetting everything we know and concentrating only on the premises of the problem and deducing its implications. Again, that's a very powerful thing to learn. But people who don't do that, they're not foolish, they're not stupid, they're just reasoning in a different way, which one can call ecological rationality. I think the Ulrichmeister is probably the first one to come up with the term. I can't avoid mentioning one other example. There's been a huge amount of discussion of the trolley problem in moral philosophy. The driver of a trolley has had a heart attack and keeled over. The trolley is careening down the tracks. It's about to plow into five workers who can't see it approaching, but you're at a switch and you can divert it into a sidetrack where it'll only kill one worker. Is it morally permissible to divert the trolley, killing one instead of killing five? Sometimes students hear this problem and they say, well, why don't you just shout hey, there's a trolley coming. Get out of the way now. That's in some ways not a legitimate answer to that problem, considered as a thought experiment to clarify our intuitions. But of course, in real life that's exactly what you should do. So this is another illustration, the difference between ecological and formal rationality and one of the reasons not to bite off our species. Okay, that's a big digression. But getting back to the examples that you gave, say about deciding when and how much to let loose, to trade off sometimes very difficult, almost incommensurable values. There is a chapter in the book on rational choice theory or expected utility theory on given that you can kind of weigh things at all, prefer one thing to another, and that's a big if, but if you can, there is a kind of a beautiful mathematical body of knowledge from John von Neumann that tells you how you ought to do that as long as you can make choices at all. In the case of say, getting drunk now versus and then having a hangover tomorrow, you can weigh off how much pleasure do I get from being drunk versus how much discomfort do I have from being hungover. But on top of that, there's the time factor, namely, how do I compare pleasure now versus pleasure a day from now, a week from now, a year from now, 10 years from now? And it is a trade off that we in fact all animals, all rational agents, have to face. And the answer isn't, oh, you shouldn't care about time. You shouldn't sacrifice your future self, your present self. There's a body of research from economics, behavioral ecology called discounting the future on what is the optimal or rational way to do it. And the reason that you really should favor the present to some extent over the future is you might be hit by a bus tomorrow, in which case any deferral of pleasure now for the future would have gone to waste. Or you might have be planning for some future event and the best made plans of mice and men go off to glay. You might have miscalculated, maybe you're putting away funds for retirement and the retirement fund goes bankrupt. So there is a way that one ought to discount the future. And of course it doesn't make sense to scrimp and save all your life for a fantastic birthday bash when you turn 80. That really is not rational. You really should consume, enjoy as you live your life. The question is how much? And there is some reason to think that people tend to discount the future too steeply, that is, even though you really ought to favor the present over the future. To some extent, people do it too much. They act as if they're going to die in a couple of years. And probably our ancestors had a high chance of dying within a couple of years. We can be expected to live into our 80s, but we're kind of stuck with the time trade offs that aren't applicable to a more predictable and longer life society. And that is a matter of rationality and it is a kind of ecological rationale because our folk wisdom already has some bits of advice, of common wisdom that acknowledges that we are apt to overvalue the present compared to the future. Like advice, like say, for a rainy day. Count to 10 before you explode. Control your anger a little more rudely. The male to male advisory for discretion in sexual matters. Keep your pecker in your pocket. There's a whole set of sayings of don't blow it now. Think about the future, think twice, hold your horses. So that's already in our value, our belief system. And it is a part of rationality that as you point out, we already stick to. In addition, of course, there's the trade off between what's good for me and what's good for someone else. So in terms of the costs of getting drunk, you really ought to factor in the risks to others from driving drunk or for getting into fights. And so it isn't just a matter of you. And as soon as you realize that, me, you, it kind of makes no difference, rationally speaking. We're just, we're all people, we all experience pain and pleasure. You've got to weight other people's well being in your decisions in order that you can insist that they weight yours in their decisions. And that means that there are a number of things that feel good in the moment that you shouldn't do at the cost of harming others with the risk that they'll harm you.