Michael Morris (14:57)
Sure. A caveat would be that in the scientific literature, someone might distinguish 30 different adaptations that distinguish humans from bonobos and chimpanzees, et cetera. But I've found it helpful over my years of teaching about this to the practical world to distinguish the three major phases that happened at different points in the Stone Age that are different, sort of the three major suites of adaptations that enabled social breakthroughs to get us from being almost like chimpanzees to being the cultural creature that, you know, that we are today. And just as an overview, I call these the peer instinct, the hero instinct, and the ancestor instinct. And we can recognize these things in us today on a day to day basis. The peer instinct is this sideways glance at classmates, neighbors, co workers, and this kind of urge to match their behaviors to mesh with what they're doing. The hero instinct is this upward attention that kind of grips us involuntarily towards CEOs, MVPs, VIPs. It's why we find ourselves reading human interest articles about whether a politician wears boxers or briefs. And we want to know what LeBron James eats for breakfast. It's kind of this drive to focus on the people who have the most success and status and to emulate the things that they are doing, the distinctive things that they are doing. And then the last wave, which may seem like the most primitive of all, but it's the crowning touch that completed the package, is the ancestor instinct. And that corresponds to our curiosity about past generations, our deep interest in the founders of our professions and organizations and nations, the way that we listen to elders, the way that we want to learn a traditional family recipe or understand what we have in common with the ways of the past. What are the traditions that are continuous and that connect us to our ancestors. And those are all different systems of psychology. And they all enabled certain breakthroughs. I can step through those breakthroughs, if that's helpful. So the first wave of tribal instincts, the peer instinct, caused a breakthrough in the ability of our forebearers to work in concert, to hunt in a hunting party, to forage collectively rather than each person for himself or herself. And biologists who kind of study subsistence peoples, they see very clearly that the economic return to coordinated foraging, whether it's hunting or gathering, is higher than the return to each person doing it individually. And so that was a major breakthrough that came, and it allowed this conformist instinct to sort of mesh with what your peers are doing. It enabled our forebearers to start working as a united front, rather than just being a collection of people. They were an organized group working with a common goal or a common plan. It involves adaptations for sharing intentions and sharing beliefs and acquiring shared habits. And we often deride this side of ourselves. We worry a lot about conformity is something that can reduce independent thinking and can contribute to the spread of incorrect ideas. But we should not forget that the great human accomplishments, whether it's in artistic creativity or Scientific creativity, they come usually from multiple people working together and multiple people building on the ideas of others in their community. And so our conformist side does occasionally inhibit our independent thinking and creativity, but it fosters most of the innovation we do, which is collective thinking, thinking as a group. Even people like Isaac Newton said, if I saw far, it was because I stood on the shoulders of giants, that there were many other people's ideas that he built upon. So that's the peer instinct, and it's the foundation of human culture and the foundation of human collaboration. We worry about it, as we should, but we should also recognize that this lemming like quality, that we tend to meld minds and mesh actions with the people around us, is a superpower that enables us to do things that other species can't. And that helped us move up the food chain, as you pointed out. Yeah. Now the next wave happened more like a half a million years ago, when our forebearer, Homo heidelberiensis, was the main species of human on the planet. And this is what we call the hero instinct. And the social breakthroughs that happen at this point that we can see in the evolutionary record appearing at this time and not appearing before this, are pro social acts. So this is when they started to be able to hunt really large game, like a woolly mammoth, where it required a lead hunter to take a personal risk for the good of the group, to get right in the face and land a glancing blow so that then others could rush in and finish the job. It's when tools took a step forward, tools that took much, much longer to build appeared. And that's because you had an individual delaying gratification, sitting in a cave for months, whittling to make a spear that would fly straight so that probably other people could be a star as a hunter. And it's also around the time when we start to see skeletons of congenitally deformed people who lived to adulthood, which didn't happen before. And that's an indicator of caring of somebody giving to another person who probably wasn't able to reciprocate directly. But pro social behavior doesn't require direct reciprocation. It's I give to other members of the community and I gain a reputation for being a hero, a good person for doing that. And then I do get rewarded by the group with social opportunities and with tribute for being a contributor. And so the hero instinct, I call it that because it causes us to want to be a hero by contributing what the group needs, even if it involves personal sacrifice. But we also have to learn what it is that the group values. And some things are pretty trivial, like if the group is starving, they would value somebody killing an antelope. But as societies became more complex, it becomes sort of non trivial to know what the group values and what the group doesn't value. And so we developed a mechanism for learning that, which is often called prestige learning, which is that we look to the people with status and success and we infer that they must be doing something right, that the group values these people because status is sort of the accumulation of positive attention from the whole community. And we can read status very easily, even from people's nonverbal behavior. Scientists who study juries claim that within an hour of interacting, there's a very clear status hierarchy on the jury that is recognized by all. And you can see it in the deference that they give each other and who gets elected foremen and that kind of thing. So we look to heroes as beacons of what the group values. And then we try to be like them, we try to contribute like they do, so that we will share in that positive esteem and in the tribute that comes with it. And it's good for individuals because it's a way of getting those social rewards, and it's good for groups because it incentivizes people to adapt the new behaviors that are causing success. And in a changing climate and in a changing social environment, you need innovations. The crop that people were planting two generations ago may not be the optimal crop to plant now. Our forebearers lived through periods of global warming way beyond what were worried about today. The ice age involved 10 degree variations, and so there was great variation in the ecology that they had to deal with. And so what you want is adaptive change. You want many members of the group to move in the direction of what's working for a few. And the hero instinct gives that to the group. And then the final wave of genetic evolution that kind of made us fully human didn't come until the last 100,000 years, in my view and in the view of most current evolutionists. And that is a new system of psychology that instead of if the peer instinct caused us to want to be normal, to do what most people are doing, and the hero instinct caused us to want to be normative, to do what the standout people are doing, this final wave caused us to have this strange sentimentality about past generations that caused us to want to perpetuate the ways of past generations, to maintain traditions, to keep alive the wisdom of the past. So the ancestor instinct created tribal memory. It created a collective level memory. And then human groups didn't have to reinvent the wheel every generation. And the hero instinct energy towards contributing to the group could go into building on the knowledge of past generations rather than recreating it. And when that happened and you had all three of these instincts working together, we crossed a Rubicon in evolution, which is usually referred to as cultural accumulation. And what that meant is that our early human groups started accumulating more and more shared knowledge with each generation, while hanging on to most, not all, but most of the inherited knowledge from prior generations. And so the pool of shared knowledge that any individual could tap into was richer and richer. And so human groups became wiser and wiser over time without individuals becoming any brains stopped getting bigger. You know, our brains are no bigger than Neanderthals, but our communities are so much richer in knowledge than Neanderthal communities were. And it's that cultural accumulation that's really the secret weapon that propelled humans, and in particular Homo sapiens, our species of humans, into the stratosphere in terms of our survival ability and our ability to dominate other species and dominate the planet to the point where the only threat to us is ourselves. And so that's where we are today.