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Robert M. Sapolsky

Robert M. Sapolsky Books

Neuroendocrinologist

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“We judge ourselves by our internal motives and everyone else by their external actions. And thus, in considering our own misdeeds, we have more access to mitigating situational information. This is straight out of Us Them. When Thems do something wrong, it's because they're simply rotten. When Us-es do it, it's because of an extenuating circumstance and Me is the most focal Us there is, coming with the most insight into internal state. Thus on this cognitive level, there is no inconsistency or hypocrisy and we might readily perceive a wrong to be mitigated by internal motives in the case of anyone's misdeeds. It's just easier to know those motives when we are the perpetrator. The adverse consequences of this are wide and deep. Moreover, the pull towards judging yourself less harshly than others easily resists the rationality of deterrence. As Ariely writes in his book, 'Overall, cheating is not limited by risk; it is limited by our ability to rationalize the cheating to ourselves.”

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“The connection between childhood adversity and frontocortical maturation pertains to childhood poverty. Work by Martha Farah of the University of Pennsylvania, Tom Boyce of UCSF, and others demonstrates something outrageous: By age five, the lower a child’s socioeconomic status, on the average, the (a) higher the basal glucocorticoid levels and/or the more reactive the glucocorticoid stress response, (b) the thinner the frontal cortex and the lower its metabolism, and (c) the poorer the frontal function concerning working memory, emotion regulation, impulse control, and executive decision making; moreover, to achieve equivalent frontal regulation, lower-SES kids must activate more frontal cortex than do higher-SES kids. In addition, childhood poverty impairs maturation of the corpus callosum, a bundle of axonal fibers connecting the two hemispheres and integrating their function. This is so wrong—foolishly pick a poor family to be born into, and by kindergarten, the odds of your succeeding at life’s marshmallow tests are already stacked against you.”

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Book:Behave: The Biology of Humans at Our Best and Worst
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“Hunter-gatherer societies have typically been egalitarian, as we'll soon see, throughout hominin history. Inequality emerged when stuff, things to possess and accumulate, was invented following animal domestication and the development of agriculture. The more stuff, reflecting surplus, job specialization, and technological sophistication, the greater the potential inequality. Moreover, inequality expands enormously when cultures invent inheritance within families. Once invented, inequality became pervasive. Among traditional pastoralists or small-scale agricultural societies, levels of wealth inequality match or exceed those in the most unequal industrialized societies. Why have stratified cultures dominated the planet, generally replacing more egalitarian ones? For population biologist Peter Turchin, the answer is that stratified cultures are ideally suited to being conquerors. They come with chains of command. Both empirical and theoretical work suggest that in addition, in unstable environments, stratified societies are better able to survive resource shortages than egalitarian cultures by sequestering mortality to the lower classes. In other words, when times are tough, the unequal access to wealth becomes the unequal distribution of misery and death.”

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Book:Behave: The Biology of Humans at Our Best and Worst
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“Once people with epilepsy were virtuously punished for their intimacy with Lucifer. Now we mandate that if their seizures aren’t under control, they can’t drive. And the key point is that no one views such a driving ban as virtuous, pleasurable punishment, believing that a person with treatment-resistant seizures 'deserves' to be banned from driving... it is important to remember that some, many, maybe even most of the people who were prosecuting epileptics in the fifteenth century were no different from us—sincere, cautious, and ethical, concerned about the serious problems threatening their society, hoping to bequeath their children a safer world. Just operating with an unrecognizably different mind-set.”

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“Depression’s defining symptom is anhedonia, the inability to feel, anticipate, or pursue pleasure. Chronic stress depletes the mesolimbic system of dopamine, generating anhedonia. The link between childhood adversity and adult depression involves both organizational effects on the developing mesolimbic system and elevated adult glucocorticoid levels, which can deplete dopamine.”

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“Oh, sure, one can overdo it, and our history is darkly stained with abortive religious movements inspired by messianic crackpots. But it appears to be a continuum: too much and you end up in the realm of a Jim Jones, David Koresh, or Charles Manson, all of whom were able to lead others into a maelstrom of paranoid delusion. In the cases of Jones and Koresh, one can only do armchair forensic psychiatry to try to guess their afflictions, but Manson, alive and well, is a diagnosed schizophrenic. However, if you get the metamagical thoughts and behaviors to the right extent and at the right time and place, then people might just get the day off from work on your birthday for a long time to come.”

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Book:The Trouble with Testosterone and Other Essays on the Biology of the Human Predicament
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“…we use the dopaminergic power of the happiness of pursuit to motivate us to work for rewards that come -after we are dead- depending on your culture, this can be knowing that your nation is closer to winning a war because you’ve sacrificed yourself in battle, that your kids will inherit money because of your financial sacrifices, or that you will spend eternity in paradise. It is extraordinary neural circuitry that bucks temporal discounting enough to allow (some of) us to care about the temperature of the planet that our great-grandchildren will inherit. Basically, it’s unknown how we humans do this. We may merely be a type of animal, mammal, primate, and ape, but we’re a profoundly unique one.”

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“Anthropologists, studying everyone from hunter-gatherers to urbanites, have found that about two thirds of everyday conversation is gossip, with the vast majority of it being negative. As has been said, gossip (with the goal of shaming) is a weapon of the weak against the powerful. It has always been fast and cheap and is infinitely more so now in the era of the Scarlet Internet.”

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“Testosterone has far less to do with aggression than most assume. Within the normal range, individual differences in testosterone levels don’t predict who will be aggressive. Moreover, the more an organism has been aggressive, the less testosterone is needed for further aggression. When testosterone does play a role, it’s facilitatory—testosterone does not 'invent' aggression. It makes us more sensitive to triggers of aggression. Also, rising testosterone levels foster aggression only during challenges to status. Finally, crucially, the rise in testosterone during a status challenge does not necessarily increase aggression; it increases whatever is needed to maintain status. In a world in which status is awarded for the best of our behaviors, testosterone would be the most prosocial hormone in existence.”

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Book:Behave: The Biology of Humans at Our Best and Worst
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“Agriculture makes people dependent on a few domesticated crops and animals instead of hundreds of wild food sources, creating vulnerability to droughts and blights and zoonotic diseases. Agriculture makes for sedentary living, leaving humans to do something that no primate with a concern for hygiene and public health would ever do: namely, living in close proximity to their feces. Agriculture makes for surplus and thus almost inevitably, the uneven distribution of surplus generating socio-economic status differences that dwarf anything that other primates cook up with their hierarchies. And from there it's just a hop, skip and a jump until we've got Mr. McGregor persecuting Peter Rabbit and people incessantly singing Oklahoma.”

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Book:Behave: The Biology of Humans at Our Best and Worst
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“Say I decide that it would be a good thing to insert pictures here demonstrating cultural relativism, displaying an act that is commonsensical in one culture but deeply distressing in another. I know, I think, I'll get some pictures of a Southeast Asian dog meat market. Like me, most readers will likely resonate with dogs. Good plan! On to Google Images and the result is that I spend hours transfixed, unable to stop, torturing myself with picture after picture of dogs being carted off to market. Dogs being butchered, cooked and sold. Pictures of humans going about their day's work in a market indifferent to a crate stuffed to the top with suffering dogs. I imagine the fear those dogs feel. How they are hot, thirsty, in pain. I think, what if these dogs had come to trust humans? I think of their fear and confusion. I think, what if one of the dogs whom I've loved had to experience that? What if this happened to a dog my children loved? And with my heart racing, I realize that I hate these people. Hate! Every last one of them and despise their culture. And it takes a locomotive's worth of effort for me to admit that I can't justify that hatred and contempt. That mine is a mere moral intuition. That there are things that I do that would evoke the same response in some distant person whose morality and humanity are certainly no less than mine. And that but for the randomness of where I happen to have been born, I could have readily had their views instead. The thing that makes the tragedy of commonsense morality so tragic, is the intensity with which you just know that They are deeply wrong. In general, our morally tinged cultural institutions, religion, nationalism, ethnic pride, team spirit, bias us toward our best behaviors when we are single shepherds, facing a potential tragedy of the commons. They make us less selfish in Me versus Us situations, but they send us hurtling toward our worst behaviors when confronting Thems and their different moralities.”

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Book:Behave: The Biology of Humans at Our Best and Worst
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“I’m being diplomatic. Many readers will know of the “replication crisis” in psychology, where an alarming percentage of published findings, even some in textbooks, turn out to be hard or impossible for other scientists to independently replicate (including some findings, I admit ruefully, that wound up being cited in my 2017 book, where I should have been more discerning). Thus, this section considers only findings whose broad conclusions have been independently replicated.”

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Book:Determined: A Science of Life without Free Will
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“Correlation and causality. Why is it that throughout the animal kingdom and in every human culture, males account for most aggression and violence? Well, what about testosterone and some related hormones, collectively called androgens, a term that unless otherwise noted, I will use simplistically as synonymous with testosterone. In nearly all species, males have more circulating testosterone than do females, who secrete small amounts of androgens from the adrenal glands. Moreover, male aggression is most prevalent when testosterone levels are highest; adolescence and during mating season in seasonal breeders. Thus, testosterone and aggression are linked. Furthermore, there are particularly high levels of testosterone receptors in the amygdala, in the way station by which it projects to the rest of the brain, the bed nucleus of the stria terminalis, and in its major targets, the hypothalamus, the central gray of the mid-brain, and the frontal cortex. But these are merely correlative data. Showing that testosterone causes aggression requires a subtraction plus a replacement experiment. Subtraction, castrate a male: do levels of aggression decrease? Yes, including in humans. This shows that something coming from the testes causes aggression. Is it testosterone? Replacement: give that castrated individual replacement testosterone. Do pre-castration levels of aggression return? Yes, including in humans, thus testosterone causes aggression. Time to see how wrong that is. The first hint of a complication comes after castration. When average levels of aggression plummet in every species, but crucially, not to zero, well, maybe the castration wasn't perfect, you missed some bits of testes, or maybe enough of the minor adrenal androgens are secreted to maintain the aggression. But no, even when testosterone and androgens are completely eliminated, some aggression remains, thus some male aggression is testosterone independent. This point is driven home by castration of some sexual offenders, a legal procedure in a few states. This is accomplished with chemical castration, administration of drugs that either inhibit testosterone production or block testosterone receptors. Castration decreases sexual urges in the subset of sex offenders with intense, obsessive, and pathological urges. But otherwise, castration doesn't decrease recidivism rates as stated in one meta-analysis. Hostile rapists and those who commit sex crimes motivated by power or anger are not amenable to treatment with the anti-androgenic drugs. This leads to a hugely informative point. The more experience the male had being aggressive prior to castration, the more aggression continues afterward. In otherwise, the less his being aggressive in the future requires testosterone and the more it's a function of social learning.”

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Book:Behave: The Biology of Humans at Our Best and Worst
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“Testosterone makes us more willing to do what it takes to attain and maintain status. And the key point is what it takes. Engineer social circumstances right, and boosting testosterone levels during a challenge would make people compete like crazy to do the most acts of random kindness. In our world riddled with male violence, the problem isn't that testosterone can increase levels of aggression. The problem is the frequency with which we reward aggression.”

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“Mischel’s next step made his studies iconic — he tracked the kids forward, seeing if marshmallow wait time predicted anything about their adulthoods . [...] Five-year-old champs at marshmallow patience averaged higher SAT scores in high school (compared with those who couldn’t wait). [...] Forty years post-marshmallow, they excelled at frontal function, had more PFC [Prefrontal cortex] activation during a frontal task, and had lower BMIs. A gazillion-dollar brain scanner doesn’t hold more predictive power than one marshmallow.”

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Author:Robert M. Sapolsky
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