The Psychological Unity of Humankind

Given that we're heading towards morality and the Singularity, I imagine this is here as a dependency for a future post arguing that there is a more-or-less objective notion of morality/humaneness/Friendliness for humans. However, even though all humans are virtually alike compared to the vastness of possible mind design space, there is still, from a human perspective, an enormous amount of variation amongst people. The things that everyone has in common are ipso facto irrelevant: it would border on contradiction to tell a human that her moral stance is wrong because it is contrary to human nature, for if it really were, a human couldn't hold it.

Something to address in a future post, perhaps.

Is this true of ideas/memes also? Because there are a lot of wacky groups out there, more than just froth on the surface.

Z. M. Davis, that's not what this is a dependency for.

Ian, this principle does not hold for human artifacts and human memes; we can make large jumps through design space with many coordinated simultaneous changes.

Ah yes, you covered that in Optimization and the Singularity.

eliezer,

hm. there's a lot to this...but let's just say that when it comes to psychology the residual of non-universality seems really important to focus on in the area of individual differences. specifically, it seems entirely possible that frequency dependent personality morphs abound; e.g., all the stuff about drd4 that i've been posting on my weblog. of course, this is single-locus, but i think it's just the locus of biggest effect. i suspect that what evolutionary psychology misses is that after you account for the substrate of human universals you've got personality morphs which are playing "games" with each other, and in particular there are a host of low frequency morphs running around. these morphs are "complex" to my way of thinking, though perhaps not complex in the way you're implying (i know the evo psych argument against a lot of variation on traits). i happen to think epistasis might also be pretty significant in the transient.

second, i'm also getting curious about variation in traits we perceive as on-off, where those who are "off" are purely pathological. e.g., it turns out that 2% of the population might be "face blind" but have been cryptic because they develop techniques to mask this problem and don't talk about it. i don't think it is just a 2% vs. 98%, i think there are a few other steps "in between", though there's a skewness toward the "normal" facial recognition ability side. on the basis of this i'm willing to dig a little deeper into "human universals" to see what might crop up on the margins.

You can have real X-Men, check out a discovery special about "real superhumans". There was one guy who could withstand cold so well that the doctors thought it shouldn't be possible. A single mutation sometimes does create significant changes (and in this case advantages).

http://www.discoveryhd.ca/shows/castdetails.aspx?cid=4619&sid=4608

razib, great post. Overall, if there's a particular weakness among enthusiasts (and "experts") in rational thinking, it's a tendency towards overreductionism. Way to often the discussion here goes from Most X are Y to let's discuss why X is Y. It can be revealing to analyze the subset of X that aren't Y, as well as the overall distribution of X according to how much they are or aren't Y. But these other analyses are done or discussed much here at OB, or at most similar sites.

In general, I definitely agree with this post. Though I put little trust in Donald E Brown, my concerns aren't relevant here. Slightly relevant is the fact that it seems conceivable that the complex functional adaptations of humankind are so numerous and so complex that we exist at an equilibrium where more critical adaptations appear in almost everyone but significant adaptations exist which are less critical. Genes necessary to those adaptations might break regularly and not be weeded out by selection quickly. If such adaptations are numerous, most people might be missing several. Other adaptations might require, as vision does, environmental conditions that are reliably present in the ancestral environment but which may not be so reliably present today in order to emerge.

Lessons:

1) A situation with AIs whose intelligence is between village idiot and Einstein -- assuming there is a scale to make "between" a non-poetic concept -- is not very likely and probably short-lived if it does occur (unless perhaps it is engineered that way on purpose).

2) Aspects of human cognition -- our particular emotions, our language forms, perhaps even pervasive mental tricks like reasoning by analogy -- may be irrelevant to Optimization Processes in general, making their focus for AI research possibly "voodoo doll" methodology. AI may only deal with such things as part of communicating with humans, though mastering them well enough to participate effectively in human culture may be as difficult as inventing new technologies.

3) Optimization Processes built by Intelligent Designers can develop in ways that those built by evolution cannot because of multiple coordinated changes (this point has been beaten to death by now I think).

4) Sex is interesting.

For once, I have no complaints. I assume the path is being cleared for a discussion of what actually IS required for an optimization process to do what we need it to do (model the world, improve itself, etc), which seems only marginally related to what our brains do. If that's where this is headed, I'm looking forward to it.

I agree with the basic points about humans. But if we agree that intelligence is basically a guided search algorithm through design-space, then the interesting part is what guides the algorithm. And it seems like at least some of our emotions are an intrinsic part of this process, e.g. perception of beauty, laziness, patience or lack thereof, etc. In fact, I think that many of the biases discussed on this site are not really bugs but features that ordinarily work so well for the task that we don't notice them unless they give the wrong result (just like optical illusions). In short, I think any guided optimization process will resemble human intelligence in some ways (don't know which ones), for reasons that I explained in my response to the last post.

Which actually makes me think of something interesting: possibly, there is no optimal guided search strategy. The reason why humans appear to succeed at it is because there are many of us thinking about the same thing at any given time, and each of us has a slightly differently tuned algorithm. So, one of is likely to end up converging on the solution even though nobody has an algorithm that can find every solution. And people self-select for types of problems that they're good at.

The theme of this post isn't very accurate, as large phenotypic polymorphisms in various other species demonstrate - e.g.:

Where did the reasoning go off the rails?

It isn't just the case of males and females where different alleles can form a truce. There's the whole phenomenon of frequent-dependent selection. Most people are familiar with this from blood types, and sickle-cell anaemia. Alleles with phenotypic effects involving disease resistance can be advantageous when rare and disadvantageous when common - resulting in them never going near extinction or fixation.

Also, this premise is inaccurate:

Gene B can spread if gene A is present at a frequency of 20% in the population - provided it is not deleterious in the absence of gene A. Sure, then the selection pressure maintaining it is reduced by a factor of five, but that's not necessarily enough to kill it off.

Finally, phenotypic variation does not necessarily depend on genetic variation. There's also the influence of the environment to consider. In general, the environment is quite capable of sending some organisms down different developmental paths depending on the circumstances in which they find themselves. This is known as phenotypic plasticity.

There are plenty of examples of phenotypic plasticity in humans - e.g. the effect is an important part of the reason why a Sumo wrestler and a racing jockey have different phenotypes.

I argue that the idea that complex adaptations are necessarily universal is fundamentally not correct - in my "Species Unity" essay:

http://alife.co.uk/essays/species_unity/

What if, somehow, you had two different adaptations which both only assembled on the presence, or alternatively the absence, of some particular developmental gene? Then the question becomes: Why would the developmental gene itself persist in a polymorphic state? Why wouldn't the better adaptation win - rather than both adaptations persisting long enough to become complex?

A mixed-strategy equilibrium?

The supposed psychological unity of human kind seems to be part of the "CEV" idea - since it suggests the intersection of human desires might be large.

However, if humans frequently want conflicting things - due to them all wanting to selfishly promote their own ends - the intersection of all human desires seems as though it would be smaller and of less interest.

A funny example of how two different complex adaptations can stably coexist within the same sex is Sepia apama, although this does involve cross-dressing. (I learned this from the BBC Life TV series, which is just amazing. I strongly recommend it to everybody.)

I've got to disagree with this one. Let's take a concrete example, say pity. The ability to feel pity is a complex adaptation, and so all persons feel pity. However HOW MUCH any one person feels pity for others is a highly variable quantity. It varies dramatically from person to person, and from situation to situation; moreover, some people, (eg psycopaths) don't feel any pity at all: their pity mechanism is broken, defective. Therefore the only conclusion you can draw from the alleged "Psychological unity of humankind" is that they will feel some unknown amount of pity in a certain situation, unless of course, they feel none at all.

The possible scale for pity ranges from 0 to some (unknown) maximum. Alleging the "psychological unity of humankind" gives you no additional information.

You can make the same null statement about every other human psychological trait, from conscientiousness to competitiveness.

You can't even state " 'Smorgraph' does not exist, since I have never felt it" because of course, your smorgraph generator or detector may be defective.

Lastly, since human beings were, until a couple of hundred years ago, in relatively isolated breeding pools, with fairly limited transfer of genetic materials between pools. This is still the case, although to a lesser degree. (compare the amount of gene transfer between Lima, Peru and Ontario, Canada vs the amount of gene transfer within the city of Toronto). It is highly likely that differential evolutionary pressure drove evolution in different direction in different sub-populations. The most famous examples of these are physical adaptations, like sickle cell anemia, an adaptation against malaria, and the ability to digest milk sugar, etc, but the same kind of evolutionary pressure no doubt also drove expression levels of psychological adaptations. Psychological mechanisms are obviously heritable and shaped by evolution. ie, in some ancestral environments, no doubt it was MORE ADVANTAGEOUS to be highly loyal, or to be very calm and dispassionate, or to be extremely vengeful and quick to anger, or to be deeply concerned about the well-being of your children, or to be very lustful, or extremely conscientious. These are adaptations, and your evolutionary environment is going to slide them up or down, based on differential survival rates.

Thus, it is HIGHLY PROBABLE that people in one ancestral sub-population are far more like EACH OTHER psychologically that they are psychologically like other human beings. The examples of this, which are legion, are commonly called 'prejudice'. Prior probability would probably be a more scientific term.

'The psychological unity of mankind' is nothing more than a fairy story, something good hearted (or weak headed) people WANT to believe, because they are afraid that people 'being different' will lead to pogroms and lynching and blind discrimination. Well, probably it does. But, it's still TRUE.

Donald E. Brown's list of human universals is a list of psychological properties which are found so commonly that anthropologists don't report them.

I've looked for that link before, and couldn't find it. It's closely related to Moral Foundations Theory, which is basically 6 categories for features of morality which are found in every culture.

My thought for a minor caveat: there may be one or two complex mental adaptations that are not universal.

My idea here is that something changed to trigger the transition from agrarian society to industrial society. For example, maybe there's a new brain innovation related to science, engineering, language, math, logical thinking, or epistemology.

Or not. This change could also have been driven simply by cultural memes of science and invention, after the final piece of complexity was already fixed in the population, so that if a group of children from 10,000 years ago were transplanted into today's world, they would be just as inclined to become scientists, engineers or philosophers as modern children. On the other hand, it could also be that these children would be disproportionately inclined to become engineers rather than scientists, or vice versa. Or maybe the ancient children would have fewer independent thinkers. Or would have worse language or math talent.

I see no way of testing this hypothesis though.