Tag Archives: Intelligence

Whence Better Brains?

The cover story of the July Scientific American is on brain physics. It persuades me that raw brain hardware was more important than I’d thought in our history.  Here is my current best guess on brain history.

Across diverse species we see strong convergence in brain organization, especially conditional on brain size. Species differ more in their brain hardware components, and their energy sources. For example, primates have innovative cell designs allowing higher neuron density. Given access to such cells, primates could afford to evolve bigger brains, and then bigger pair-bond-based social groups.

Humans found a way to use big primate brains to support big-group far-traveling long-life versions which could access richer energy sources, which in turn supported large energy-hungry brains. Humans found a way to use those huge old social brains to support robust accumulation of culture, which is our main advantage over other primates. This was probably supported by only minor changes in brain organization.

While the brains of smarter humans today may use a better set of long term connections, probably most of their advantage comes from using more energy-intensive brain hardware. So it probably wasn’t until our recent cheap energy era that high IQ humans gained large advantages. The tendency 0f smarter humans to choose lower fertility lowers their advantage today.

Many quotes from that article: Continue reading "Whence Better Brains?" »

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BHTV with Brian Christian

Just four weeks after my last episode, here is a new (63 min.) Blogging Heads TV episode, this time with Brian Christian, author of the new celebrated (NYT, New Yorker) book The Most Human Human:

Christian describes competing in a Turing test to be seen as more human than rival chat-bots, and he offers his approach in that contest as a general philosophy of life: we should all try to live our lives to be hard for machines to mimic.

Conversations that demure, dodge, lighten mood, change subject, “shouldn’t be allowed to pass as real human conversation.” He is “contemptuously unwilling to act like a bot” when arguing, by just responding to the last thing the other person said. He dislikes nightclubs where you can’t hear others well, and the cautious and structured styles that make “the language of some salesmen, seducers, and politicians so half-human.” He much prefers people interrupting each other to politely taking turns.

Christian hates customer service systems that make agents follow scripts, won’t give agents much discretion, and keep switching who each customer deals with. “Fragmentary humanity isn’t humanity.” He also dislikes “micromanagement” and structure work more generally, celebrating architects who refuse to change their practice to scale it up to more customers, and actors who only perform a play once so their acting is maximally fresh. Christian prefers academic domains with fuzzy or broad boundaries, real over simulated images, painting subjects that won’t sit still, flexible role playing over games with clear rules.

So is he right? Often my personal preferences do lean in Christian’s direction; he and I share many tastes. But I just can’t see why one should try especially to be hard for machines to mimic, over and above the other usual reasons for our actions. For example, yes scripted customer service agents can be less pleasant to deal with, and are sometimes frustratingly inflexible, but they are generally cheaper and easier to manage. Over the coming decades it remains an open question how much customers will be willing to pay for more “human” service. If customers end up preferring services, I can’t say they’d be obviously wrong.

More generally, the vast wealth of our industrial world comes in part from our willingness to structure our work lives more than our ancestors would tolerate, following the many scripts and procedures that Christian finds distasteful. We constantly choose between more personal flexibility and the rewards from fitting into larger structures. I don’t feel qualified to tell people they are systematically choosing too little flexibility, and I don’t see Christian as being any more qualified.

In the video, I presented this argument to Christian and he didn’t seem to have much of a response. In fact, he didn’t seem to have considered the question before – it seems none of the many reviewers and interviewers who celebrated his book challenged him on his main thesis. Apparently, it is rare for an interviewer to directly inquire into the main argument for such a book’s thesis. While books like The Most Human Human give the appearance of arguing for a thesis, that is apparently just a thin cover for other offerings – few ever engage them as arguments.

And admittedly, such books do offer long lists of fascinating facts, a pleasant experience listening to an articulate voice, a way to affiliate with an impressive person, and an excuse to talk knowingly with friends about important and interesting sounding topics. What more could a reader want?

Added 3Apr: It seems the comments at BHTV are equally divided between those who think I’m obviously right, and those who think Brian is.  I’m always fascinated by this sort of situation.

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Play Talk Still Tells

Many animals have a concept of “play.” At times and places where they feel safe, friendly associates practice important motions, like chasing or fighting, but try to avoid any big effects – they retract their claws, pull their punches, etc. Play is an important way for young animals to learn how to act like old ones. Humans retain youthful styles longer into life, and so we play all through life.

Humans also developed language, which enabled stronger social rules about forbidden behaviors. For example, not only are you not supposed to kill associates, you are supposed to punish those who do kill, and those who refuse to punish killers, etc. Language let humans tell others about rule violations, to recruit a wider circle of enforcers than just direct witnesses.

Humans also tend to have rules about what you shouldn’t say. For example, foragers not only forbid domination, at least between families, they also forbid talk that supports domination. So foragers are typically not supposed to brag, threaten, or give orders. The more ancient concept of play, however, let humans evade such rules on forbidden talk. Let me explain.

Just as there is play chasing, play fighting, or even play mating, there is also play talk. Like other kinds of play, play talk only makes sense among friendly associates, when they are in a relaxed and unthreatened mood. Play talk should take the general forms of regular talk, but with claws retracted, punches pulled, etc., and everyone acting relaxed and unthreatened. Play talk should not be directly on serious topics with large important consequences, where people get stressed or angry.

With a little indirection, however, even play talk can communicate on serious important topics. For example, while social rules might forbid directly propositioning others for sex, people often communicate an interest in sex by joking about it in the right way. As long as there are other plausible interpretations of their words and actions, it can be hard for others to accuse them of violating the social rules.

It is easier to use play talk to evade talk rules if groups develop a very local culture and language – particular words and associations that have particular meanings due to the local history. This makes it harder to clearly convince outsiders that something illicit was communicated. It can also be easier to use this trick at the expense of folks who are eager to show their loyalty to the local group – publicly accusing another group member of violating talk rules ends the play mode and risks seeming less friendly to the group, especially if the local group isn’t very vested in that particular rule. Finally, it is easier for smarter people to talk indirectly so that they understand each other, but outsiders do not (achieve common knowledge that they) understand.

Humans thus developed sophisticated capacities for using play talk to indirectly communicate on serious topics. We became very adept at and fond of playfully talking on two levels at once, especially when the more hidden level talks about or embodies rule violations. We are so fond of this sort of activity and ability, in fact, that we often consider a surplus of it the main reason we like or love someone, and a deficit of it almost a definition of being inhuman. And such rule-evading abilities were so important that we developed ginormous brains to support them.

I am talking of course about humor, and sense of humor. We cherish our friends and lovers for making us laugh, and we think inhuman robots and despots couldn’t have a good sense of humor. We not only playfully talk illicitly via humor, we also play at humor, practicing this general capacity through endless variations of stories where a hidden often-rule-violating meaning is just barely revealed to wise listeners. Homo hypocritus hones humor. This is who we are.

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Dumb Farmers

Apparently the foraging life is more mentally demanding than is the farming life.  Brain size rose during the forager era, but fell during the farming era. During the industry era brain size is rising again, yet another way we are returning to forager ways with increasing wealth.

Combined with social brain theory, that our brains are big to deal with complex social worlds, suggests farmer social worlds are less complex.  Perhaps this is because stronger town social norms better discourage hypocritical norm evasion.

The data: Continue reading "Dumb Farmers" »

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Smart Beliefs

Adult intelligence predicts adult espousal of liberalism, atheism, and sexual exclusivity for men (but not for women), while intelligence is not associated with the adult espousal of evolutionarily familiar values on children, marriage, family, and friends. … Childhood intelligence at age 10 significantly increases the probability that individuals become vegetarian as adults.

More here.  The author interprets these findings:

More intelligent individuals should be better able to comprehend and deal with evolutionarily novel (but not evolutionarily familiar) entities and situations. …. There has been accumulating evidence for this. …

  1. Individuals’ tendency to respond to TV characters as if they were real friends … appears to be limited to those with below-median intelligence. …
  2. Net of age, race, sex, education, marital history, and religion, less intelligent individuals have more children than more intelligent individuals, even though they do not want to do so. …
  3. More intelligent individuals stay healthier and live longer … [but] general intelligence does not appear to affect health and longevity in sub-Saharan Africa, where many of the health threats and dangers are more evolutionarily familiar. …
  4. Criminals on average have lower intelligence than the general population … Much of what we call interpersonal crime today, such as murder, assault, robbery, and theft, were probably routine means of intrasexual male competition in the ancestral environment, … [and] the institutions that control, detect, and punish criminal behavior in society today—the police, the courts, and the prisons—are all evolutionarily novel. …

Liberalism … [is] the genuine concern for the welfare of genetically unrelated others and the willingness to contribute larger proportions of private resources for the welfare of such others.  Defined as such, liberalism is evolutionarily novel. Humans … are not designed to be altruistic toward an indefinite number of complete strangers whom they are not likely ever to meet or exchange with. … There is no evidence that people in contemporary hunter-gatherer bands freely share resources with members of other tribes. …

Our ancestors … could have attributed [an ambiguous situation] to intentional forces when they are in fact caused by unintentional forces … or they could have attributed them to unintentional forces when they were in fact caused by intentional forces. … [The] evolutionary origin of religious beliefs in supernatural forces may stem from such an innate bias to commit Type I errors rather than Type II errors. … Out of more than 1,500 distinct cultures … only 19 contain any references to atheism. …

A species-typical degree of polygyny correlates with the extent of sexual dimorphism in size. … On this scale, humans are mildly polygynous, not as polygynous as gorillas, but not strictly monogamous like gibbons. Consistent with this comparative evidence, … an overwhelming majority of traditional cultures in the world (83.39 percent) practice polygyny with only 16.14 percent practicing monogamy and 0.47 percent practicing polyandry.

The results are interesting and worth pondering, but it is still far from clear to me why the modern world should push smart folks in these directions.  Is it that smart folks are more open minded and willing to adopt new beliefs?  If so, why do they differ only on some topics but not on others?  Is it that some beliefs are newly rewarded in the modern world, and smart folks are faster on the uptake?  This makes some sense of monogamy values, since the farming revolution has preferred that institution (longer term investments, easier to hold women).  But how does this story make sense of smart folks being more liberal, atheist, or vegetarian?

HT Ajay Menon

Added 11a: Folks, these beliefs cannot credibly signal smarts if dumb folks can hold them as easily.  Perhaps dumb folks cannot defend these beliefs as ably, but dumb folks cannot defend any belief as ably.  So credibly signal smarts via defending such beliefs, it would have to be that one’s smarts shone more clearly when defending these beliefs, vs. when defending other beliefs on the same topic.

Could these be more far-mode beliefs, and smarties tend to think more far?

Added 28Feb: Apparently this source has questionable reliability.  So I won’t try so hard to explain his odd results.

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