evolving social norms

in Experimenting with Social Norms ensminger and henrich compile several very interesting studies on prosocial “fairness” norms conducted on various populations of different types — ranging from hunter-gatherers to urban factory workers — from around the world. three different economic experiments were conducted on the various populations (although it’s not clear to me if all three were run on each group — i haven’t read through all of each of the studies chapters yet): the ultimatum game, the third-party punishment or altruistic punishment game, and the dictator game.

the authors conclude that [pgs. 89-90]:

“1. Fairness and punishment show both reliable patterns and substantial variability across diverse populations.
2. Fairness increases with a population’s degree of market integration.
3. Fairness increases with an individual’s participation in a world religion.
4. Willingness to engage in punishment increases with community size.”

they ultimately conclude “that social norms evolved over thousands of years to allow strangers in more complex and large settlements to coexist, trade and prosper” — but they just mean that the norms and the cultures evolved, not the peoples.

possible biological/evolutionary reasons for the findings are given some consideration, but only across one and a half pages, and the authors end with the following [pg. 139]:

“Genetic differences between populations or groups would most likely account for the behavioral patterns we observe if they arose in response to stable differences in the culturally evolved social norms and institutions (formal and informal) found in different societies. Norms and institutions, in creating stable regularities in the local social environment, can theoretically produce conditions for natural selection to act on genes that make individuals better adapted to those particular norms and institutions (Henrich and Boyd 2001; Laland et al. 2010; McElreath, Boyd, and Richerson 2003; Richerson et al. 2010). This is an intriguing and provocative possibility, but there is no evidence at this point supporting a suspicion that such a culture-gene coevolutionary process has occurred.”

…and it’s too scary to think about anyway, so we won’t give it any more ink here. (>.<)

in 2010, re. pretty much the same data sets/findings, they had this to say [my emphasis]:

“These findings indicate that people living in small communities lacking market integration or world religions — absences that likely characterized all societies until the Holocene — display relatively little concern with fairness or punishing unfairness in transactions involving strangers or anonymous others. This result challenges the hypothesis that successful social interaction in large-scale societies — and the corresponding experimental findings — arise directly from an evolved psychology that mistakenly applies kin and reciprocity-based heuristics to strangers in vast populations (4,5), without any of the ‘psychological workarounds’ (42) that are created by norms and institutions. Moreover, it is not clear how this hypothesis can explain why we find so much variation among populations in our experimental measures and why this variation is so strongly related to MI, WR, and CS. The mere fact that the largest and most anonymous communities engage in substantially greater punishment relative to the smallest-scale societies, who punish very little, challenges this interpretation.”

this is old school evolutionary psychology at its worst — that human nature and the human psyche (and there’s only one sort in this viewpoint) stopped evolving at the end of the last ice age when a majority of us quit being hunter-gatherers.

well, i’ve got news for them: evolution in humans is ongoing, recent, can be pretty rapid (within some constraints), and has been/is localized (as well as global). in fact, human evolution has sped up since the agricultural revolution since the number of individuals, and therefore mutations, on which natural selection might work skyrocketed in post-agricultural societies.

remember, too, that all human behavioral traits are heritable (and more down to biology than many like to think), “every society selects for something,” and that we’re talking about frequencies of genes in populations and that those frequencies can fluctuate up and down over time.

given all of the above, there are NO good reasons for dismissing genetic or evolutionary explanations for variations in social norms between populations (and individuals for that matter). since we are biological creatures, biological explanations should be ruled out (properly!) first before moving on to other sorts of explanations.

again ensminger and henrich said:

“This result challenges the hypothesis that successful social interaction in large-scale societies — and the corresponding experimental findings — arise directly from an evolved psychology that mistakenly applies kin and reciprocity-based heuristics to strangers in vast populations, without any of the ‘psychological workarounds’ that are created by norms and institutions.”

no, of course not. a more likely scenario is that the behavioral traits realted to social norms in large-scale societies — post-agricultural societies (and post-post-agricultural societies) — evolved with some rapidity away from what had existed before in smaller societies thanks to: 1) the larger population size itself (generating a greater number of mutations), and 2) the larger societies and the structures that developed exerting new selective pressures on those populations in sort-of giant feedback loops — society selects for genes for new behavioral traits which in turn produces new societal forms, and so on.

more from the authors:

“Moreover, it is not clear how this hypothesis can explain why we find so much variation among populations in our experimental measures….”

well, that’s easily explained if you remember that human evolution is ongoing, recent, pretty rapid, and can be local.

to take just one example from their findings, if we look at their results from the dictator game…

mean dictator game offers

…it was primarily members of the hunter-gatherer or horticulturalist groups who gave low offers in the game, african agriculturalists (or pastoralists) middling offers, and the residents of hamilton, missouri, the highest. (annoyingly, a couple of the populations — accra and isanga — are groups of mixed ethnicities, so it’d be difficult for anybody to tease apart what’s going on.)

well, hunter-gatherers and horticulturalists — like the hadza, the tsimane’, the au, and the sursurunga — have largely missed out on the agricultural revolution and its evolutionary effects. the middling offers from the mostly african (mostly bantu) agriculturalists are not a surprise either since agriculture and the development of large-scale societies got going comparatively late in sub-saharan africa. and that the hamiltonians offered up the most money — and have the highest market integration — probably owes a lot to the fact that that population is a part of the u.s. midlands and are descended from a group that experienced the agricultural revolution back in the neolithic, and furthermore went through the selection pressures created by medieval manorialism and long-term outbreeding (and who knows what else?).

those are just a few ideas for starters. i’m sure it’s much more complicated than that. for instance, why are the tsimane’ forager-horticulturalists so stingy while the au from papua new guinea, who are also forager-horticulturalists, quite generous? i dunno, but one possibility i suggest checking out is the difference in the family structures of the two groups (prolly will be difficult to do this very far back in time): the interconnectedness of au families, which stretch between villages, is quite complex, while tsimane’ families are not so much (afaik). among many other possibilities and scenarios, we should be looking for the selection pressures created by family types and the flow of genes (especially for behavioral traits like altruism) through different family types.

one final thing – ensminger and henrich et al. from 2010:

“Methodologically, our findings suggest caution in interpreting behavioral experiments from industrialized populations as providing direct insights into human nature.”

well, quite. but it works in the other direction, too: we should also be cautious in interpreting behavioral experiments from non-industrialized populations as providing direct insights into human nature(s).

see also: The 10,000 Year Explosion

(note: comments do not require an email. citizens against prosocial behaviors.)

germany and the migrants

several people have compared the current migrant crisis in europe to the arrival of the barbarians in rome in the fourth century — for example, here’re steve sailer, peter frost, and historian tom holland. their concern — at least that of steve and peter — is the future of the west: will these migrants (help to) bring down modern western civilization just as the goths et al. did to rome? the question is not just an emotional or an irrational one — migration is one of the main driving forces of evolution (along with things like natural selection and genetic drift), since the movement of individuals from one population to another also means the movement of genes. and because all behavioral traits are heritable, the transference of genes via migration ought to be a matter of interest and importance to one and all. (that’s not to say that it should never be allowed, just that people(s) ought to pay it due attention.)

what i haven’t seen though are any comparisons to a more recent mass migratory event, one which also happened to feature germany, a major player in today’s migrant crisis. i suppose that’s because the whole subject is rather sensitive, but that’s no excuse for ignoring it — rather to the contrary! so, here goes…

in the late-1800s/early-1900s, at least a couple of million (i haven’t been able to find a precise number) eastern european jews migrated to and/or through germany. and how well did that work out for everybody?

from Unwelcome Strangers: East European Jews in Imperial Germany [pgs. 11-12]:

“In the last two years of the 1860s, a few thousand Russian Jews crossed into Prussia seeking relief from cholera epidemics and famines that were wreaking havoc in the western part of the Tsarist Empire. Desperately ill and malnourished, the refugees deluged their German coreligionists with pleas for economic assistance and medical attention. The latter responded by launching numerous ad hoc committees that collected funds throughout Germany and then funneled their receipts to Jewish communities along the frontier; these, in turn, provided relief to the needy. In time, the immediate crisis passed. Many of the Russian Jews remained in Prussia or traveled farther west, some as far as the New World. And the ad hoc committees, convinced that their mission had ended, folded their operations….

“Over the next half-century, the momentum of Jewish emigration from Russia steadily increased. During the 1870s perhaps 40,000 to 50,000 Jews migrated westward. After the pogroms of 1881, however, the trickle turned into a flood as tens of thousands abandoned their homes annually…. By the early twentieth century, over 100,000 such refugees emigrated each year, so that by 1914 at least two and a half million Russian Jews had settled in Western countries, including England, France, Canada, Argentina, and principally the United States.

“Concurrently, Jews from the Austro-Hungarian Empire and Rumania also were on the move. In the face of economic boycotts and rising unemployment at the end of the nineteenth century, Jews emigrated from the Polish sectors of the Hapsburg Empire. Rumanian Jews, too, made their way west after their country denied them citizenship and introduced blatantly anti-Jewish policies….”

(yes, eastern europeans are, on average, more xenophobic than most western european populations. and, judging by the above, they apparently have been for some time).

“…Between 1870 and the outbreak of World War I, over 400,000 Jews left their homes in the Galician, Bohemian, Moravian, Hungarian, and Rumanian lands to seek a new future in Western countries, while and even larger number migrated *within* the Austro-Hungarian Empire.

“Whereas anti-Semitism and impoverization provided the push to drive Jews *from* Eastern Europe, emigrants were also drawn *to* Western lands. They were lured by the promise of eonomic opportunity in the more industrialized West and the knowledge that their fellow Jews in England, France, Germany, and the New World countries enjoyed comparatively greater freedom and prosperity. The promise of toleration and opportunity, therefore, also attracted adventuresome Jews to seek their fortunes in new environments.

funnily enough, during at least some of this period, germany behaved more like macedonia or serbia today, shuffling the migrants onwards to the next country (making a ton of cash in the meantime, sounds like). ‘course the eastern european jews wanted to just migrate through germany, kind-of like the middle eastern/north african/african migrants of today don’t want to stay in macedonia or serbia or hungary [pgs. 13-14]:

“Germany had a vested economic interest in allowing Jewish refugees into the Reich. For Germany — and especially its shipping companies — hoped to benefit from the lucrative business of transporting Eastern Jews to England and America via the ports of Hamburg and Bremen. The sheer number of Jewish transmigrants embarking from German ports was staggering, exceeding 700,000 during the peak years between 1905 and 1914….

“The extent of German interest in encouraging Jewish transmigrant traffic is illustrated by some of the policies pursued by governments and shipping firms. For example, according to Prussian decrees in force between the 1890s and the outbreak of World War I, no Russian transmigrant was officially allowed into Germany without a proper pass, a ticket for passage out of the country, plus an additional sum of money. (Each person over ten years of age had to posses 400 mark, and children needed 100 mark.) Significantly, individuals holding tickets on German ships were exempted from this rule and permitted into the Reich even if they possessed less money. Perhaps the most revealing episode in the campaign to develop the transmigrant traffic occurred in 1893 when the eastern-most states of the Reich sealed their borders in response to cholera epidemics in Eastern Europe. Led by the Hamburg America Line, German shipping companies successfully lobbied for a reversal of this policy, arguing that Jewish transmigrants posed no health risk to the German populace. To further allay fears, shipping firms expended significant sums of money to erect special transport centers in key German cities and vast barrack areas in port cities; such facilities were designed to isolate Jewish travelers from the German populace and thereby eliminate objections to the temporary presence of these Jews on German soil.”

unfortunately, even though most of them didn’t even stay very long in germany, the ostjuden left a bad impression on the minds of germans. i couldn’t even tell you if any of the stereotypes were true or not, and if true by how much — and i really don’t want to get into a discussion about it here and now (although i strongly suspect that eastern european jews are, on average, more clannish than german jews, so there’s possibly that) — but even german jews at the time panicked a bit over the behaviors of their eastern cousins. from Brothers and Strangers: The East European Jew in German and German Jewish Consciousness, 1800-1923 [pgs. 33, 57]:

“German Jews undertook massive charitable work on behalf of the persecuted East European Jews at the same time that they sought the most efficacious means to prevent their mass settlement in Germany….

“Ultimately the difference between German Jews and Ostjuden, both in and out of Germany, was regarded as cultural in nature. Liberal German Jews viewed Eastern Jewish culture as ‘ghetto’ culture which by definition was backward and underdeveloped. The German historical experience had made it abundantly clear that Jewish modernization was conditional upon deghettoization, and this in turn left no room for *Kulturjuden* along the lines still maintained in Eastern Europe.

“This point of view was perfectly understandable. German Jews felt like Germans and their culture *was* German culture. By the beginning of the twentieth century they possessed almost nothing akin to the ‘Jewish’ culture that characterized life in the ghettos of Eastern Europe. The distance they felt, the dissociation from Ostjuden was, then, predicated upon both an objective and subjective reality.”

eastern european jews had a very different (bio-)culture to german jews and gentiles, one that, unfortunately, did not sit well with too many members of the mainstream culture. (the timing was bad, too. more on that below.) am i blaming jews for the holocaust? no. but i am warning — again — that in order to prevent future genocides, we need to understand previous ones, and that includes examining them with a biological/evolutionary eye. as i said previously:

“humans don’t *really* fight and kill neighboring populations or discriminate against subgroups within their nations — not to mention enslave one another — for any of the goofy ideological, religious, or ‘moral’ excuses that they give. those are mostly just after the fact rationalizations that they’ve come up with (no, really — the human brain is not to be trusted!). like other creatures, humans very often try to eliminate or dominate other groups *because they are in competition with them for resources* [pdf] — or, at least, *feel* that they are anyway, whatever the reality on the ground may be.”

bill hamilton pointed to the fourfold increase in the number of ashkenazi jews in eastern europe over the course of just the nineteenth century as a possible contributing factor to the holocaust. this would’ve represent an enormous change in the competition for resources between jews and gentiles in eastern europe. couple that already existing situation to the mass migration of a (bio-)culturally different population into/through germany at the turn of the century, and THEN the appalling economic conditions in germany after wwi and the stock market collapse — further feuling the competition for resources — and you have a recipe for an absolutely horrific biological disaster.

no, i’m not saying that such a scenario is guaranteed to happen again in the west with our new migrants. if there’s enough manna from heaven to go ’round, people probably won’t take it out on their neighbors. (there’s been no genocide of jews in the u.s. where times have generally been pretty good. always.) but i am saying that the powers that be ought to be MUCH more careful in shuffling peoples around willy-nilly. they’re playing a very dangerous game.

see also: us and them

previously: historic mating patterns of ashkenazi jews and gene-o-cide and human biodiversity, racism, eugenics, and genocide

(note: comments do not require an email. eastern european jewish immigrants on an american liner, 1906.)

family types and the selection for nepotistic altruism

it finally clicked in my head while thinking about polygamy what the importance of family types — nuclear vs. extended, etc. — might be in the selection for altruistic behavioral traits, especially nepotistic altruism or clannishness. i should’ve thought through polygamy sooner instead of putting it off, but hey — procrastination is heritable, too, so in the words of h. solo, it’s not my fault! (~_^)

the logic of the mating patterns/inbreeding-outbreeding theory goes that, given the right set of circumstances (i.e. certain sorts of social environments), selection for nepotistic altruism/clannishness ought to go quicker or be amplified by inbreeding (close cousin marriage or uncle-niece marriage) simply because there will be more copies of any nepotistic altruism genes (alleles) that happen to arise floating around in kin groups. in other words, inbreeding should facilitate the selection for clannishness…if clannish behaviors are being selected for in a population.

the thing is, though: the individuals carrying certain versions (alleles) of nepotistic altruism genes need to direct their nepotistic behaviors towards other individuals carrying those same alleles, otherwise their actions will be for naught. (yeah. kin selection.) if they direct their nepotistic actions towards people who don’t share the same alleles, then the actions will be “wasted” and the behavioral traits won’t be selected for — or at least not very strongly — and they might fizzle out altogether.

let’s take an imaginary society as an example: say everyone in our pretend population always marries their first cousins. their father’s brother’s daughters (fbd) even, so that we get a lot of double-first cousin marriage. h*ck! let’s throw in some uncle-niece marriages on top of it all. the inbreeding coefficients in such a society would be very high, and if clannishness was being selected for in our highly inbred population, the selection ought to move pretty quickly.

but suppose we separated all the kids at birth from their biological families and set them out for adoption by unrelated individuals — people with whom they likely did not share the same nepotistic altruism alleles. think: the janissary system, only on a population-wide scale. if we did that, there should be virtually no selection for clannishness despite all the inbreeding since pretty much no one’s nepotistic behaviors would be directed towards other individuals with the same nepotistic altruism genes. in this case, kin selection would just not be happening.

such a society does not exist, and i don’t think ever has. but there are societies out there with certain family types — namely nuclear families (or even post-nuclear family societies!) — which ought to have a similar dampening effect on any selection for clannishness.

northwestern “core” europe has had very low cousin marriage rates since around the 800s-1000s, but it has also, thanks to manorialism, had nuclear families of one form or another (absolute or stem) since the early medieval period — nuclear families are recorded in some of the earliest manor property records in the first part of the ninth century from northeastern france [see mitterauer, pg. 59]. on the other hand, eastern europeans, like the russians and greeks, while they also seem to have avoided very close cousin marriage for several hundreds of years (which is not as long as northwestern europeans, but is quite a while), have tended to live in extended family groupings. you would think that nepotistic altruism could be selected for, or maintained more readily, in populations where extended family members lived together and interacted with one another on a more regular basis than in societies of nuclear family members where individuals interact more with non-kin. societies comprised of nuclear families are more like my hypothetical janissary society above where the altruism genes that might’ve been selected for via kin selection instead fade away in the wash.

we have to be careful, though, in identifying nuclear family societies. the irish of today, for instance, are typically said to be a nuclear family society, but the extended family does still interact A LOT (i can tell you that from first-hand experience). same holds true for the greeks and, i suspect, the southern italians. i would say that these populations have residential nuclear families, but not fully atomized nuclear families which have infrequent contact with extended family (think: the english). the early anglo-saxons in england were also characterized by residential nuclear families — the extended family (the kindred) was still very important in that society. the individuals in a residential nuclear family society probably do interact with non-family more than individuals in a society structured around extended families or clans, but less so than a true nuclear family society.

the thought for the day then?: family types can also affect the selection for clannishness/nepotistic altruism.

that is all! (^_^)

previously: polygamy, family types, and the selection for clannishness and “l’explication de l’idéologie”

(note: comments do not require an email. irish nuclear family.)

a few thoughts

jayman’s got a cool new post up on clannishness and western inventiveness! here are a few thoughts from me…

jayman said re. the abstract thinking type of westerners vs. the holistic thinking type of easterners (a la nisbett) [my emphasis]:

“[A]nother key difference between Western vs. Eastern (i.e., WEIRDO vs. clannish) thought: the former see things (and themselves) as atomized individuals, while the latter view objects in the world as part of an interconnected whole. This is a defining aspect on the clannishness dimension: low-clannishness peoples (WEIRDOs) see themselves as atomized individuals, who form associations voluntarily and not necessarily based on kinship. High-clannishness peoples see themselves as inherently part of the group (e.g., family, clan, tribe, village/town, etc.)….

“How did this penchant for abstraction come about among NW Europeans? I suspect that part of it has to do with the rise of high-trust and social atomization (i.e., individualism) in NW European societies. As clannishness disappeared, and as people were no longer bound to their families or clans (and indeed, we were free to interact with non-relative in cooperative ventures), people became more free to engage in intellectually stimulating thought. Mental space previously devoted understand one’s place in society and keep ahead of schemers now could be used on more abstract pursuits.

while it’s an interesting idea, i don’t think that freed up mental capacity once dedicated to clannish traits was co-opted in the brains of westerners (nw europeans) in their post-clannishness state and then devoted greater abstract thought. maybe. but i suspect the connection is (somehow) much more direct: i think (theorize, speculate, etc.) that in simply becoming more independent individuals — i.e. less genetically like others around them thanks to outbreeding — that the mindset simply shifted. atomized individuals, atomized (and, therefore, abstract) thinking. please don’t get your panties all in a bunch. yes, this is complete and wild speculation on my part. i can’t even guess what the mechanism might have been, so don’t sue me if i’m wrong. (nw europeans, btw, began to think of themselves as individuals in the middle of the eleventh century a.d.)

another much more informed guess: that nw europeans’ exceptional ability for inventiveness especially in science (which cannot be divorced from their high average iqs — as jayman pointed out, africans are pretty inventive, but without enough iq points, no one there’s going to the moon) has a LOT to do with the selection pressures that happened thanks to the manor system which was found in nw europe during the middle ages, specifically bipartite manorialism.

to back up for a sec: inventiveness/creativity/scientific reasoning in east asians, or the relative lack of it. jayman suggests that their tendency for holistic — and, therefore, not abstract — thinking hobbles east asians when it comes to inventiveness, etc. that, i think, makes a lot of sense. i do think, though, that the cochran-harpending idea of conformity in east asia (“nails hammered down”/low levels of adhd) also makes a lot of sense. the two ideas go well together, imho. wrt the “nails hammered down” hypothesis, my bet is that that selection process goes waaaay back. complex chinese civilization (that centered around the yellow river valley) is three or four thousands of years old. i think they’ve been hammering down the contrarians/independent thinkers there for a very long time. greg cochran has mentioned that the high-altitude adaptation of tibetans works better than those of other groups adapted to living in the clouds because the tibetan adaptations have been under selection for longer (even some acquired from the denisovans and/or other archaic humans?). i suspect that this is why conformism/lack of independent thinking is so strong in east asia: it’s been under selection there for a very long time. northwest europe’s civilization is obviously much, much younger.

now, to return to northwest “core” europeans: i strongly suspect their inventiveness/abstract thinking style/scientific thinking (and other behavioral traits, for that matter) were selected for thanks to the the following medieval trifecta:

– outbreeding (i.e. the abandonment of close cousin marriage) which meant that the selection for nepostic altruism was curbed since family members would no longer share so many “genes for altruism” in common (see: renaissances), PLUS individuals became “atomized” (therefore more abstract thinking arose, etc.);
– change in family types from extended to nuclear, which again would limit the selection for nepotistic altruism since individuals would interact more with non-kin than family;
bipartite manorialism, which began in frankish territories in northeastern france/belgium and spread across nw and central europe in areas that are pretty much coterminous (prolly not coincidentally) with the hajnal line.

oh. and the ostsiedlung.

bipartite manorialism, in which tenant farmers would work for (later pay rent to) the head of a manor but also farm for themselves, operated as a sort-of franchise system in which the tenants on their individual farms had to make it or break it independently (i.e. without support from an extended family/clan, the dumber members of which would no longer be a drag on our independent farmers). there was, no doubt, cooperation between the tenant farmers which, once the outbreeding reduced the selection for nepotistic altruism, could’ve resulted in the selection for a more general, reciprocal altruism. but bipartite manorialism, i think, would’ve also selected for other traits like a propensity to be hard working, delayed gratification, and inventiveness: those individuals who came up with new ideas for improving their farming (or related) techniques could’ve bettered their place on the manor and been more successful reproductively.

chonologically, bipartite manorialism came first, arising out of the abandoned latifundia system in what had been roman gaul perhaps as early as the 500s. there also appears to have been pressure from very early on on these manors for nuclear families, so the reduction in family size may very well have come next. finally, the avoidance of cousin marriage came into full swing in the frankish territories in the 800s.

the final stage — at least as far as the medieval period goes — in the selection for “core” europeans was the ostsiedling: this was The Big Self-Sorting to the east of individuals who were already well underway to being outbred/manorialized in western germanic regions — in other words, they were well underway to being westernized as we know it. i don’t think it can be a coincidence that the heart of human accomplishment in western europe (which is also pretty much the heart of human accomplishment) is found in the manorialized regions of europe and very much where the ostsiedlung happened (see also here). my bet is that it was very much hard-working, innovative (especially, at the time, in agricultural/engineering techniques), high-achievers who went forth into the east during the medieval period. and they prospered and multiplied once they were there.

so that’s the picture as i see it so far. i reserve the right to change my mind/be utterly and completely wrong. (~_^)
_____

oh. wrt to thinking like a westerner (abstract/atomized) vs. thinking like an easterner (holistic/group), i still suspect that peripheral europeans (like me!) might think more like easterners (i.e. holistically) than northwest “core” europeans. dunno for sure, and i didn’t have enough data to confirm or refute this little idea, but i’m still hanging on to it for now. really wish an actual scientist would check it out.
_____

jayman also said [his emphases]:

“The reality is that evolution proceeds much quicker than you think. Just as HBD’ers generally understand that human evolution didn’t stop 50,000 years ago, it also did not stop 10,000 years ago, or even 1,000 years ago, or even 500 or 200 years ago. Evolution continues right up to the present day. The reason I bring this up is because I keep hearing about how X group was doing this 2,000 years ago or about how Y group was doing this 1,000 years ago, so how could they be so different now? The reason is that they have changed since that time.

hear, hear! and…duh! human evolution is recent, both global and local, ongoing, and can be pretty rapid. not in one generation, obviously, but twenty or forty is plenty of time. also, gene frequencies in populations move upwards or downwards over time — they do not (have to) remain stagnant. i quoted stephen stearns recently (here):

“Well I think what is very probably going on is that selection is moving a population up and down all the time. It goes off in a certain direction for a while, and then it goes back in the other direction. It’s only if you get a significant change in the environment that it will then continuously go in a new direction.”

and average differences in gene frequencies in populations is all you need for average differences in behavioral traits, etc. for example, i think the ancient greeks might’ve moved from a shame to a part-guilt and back to a shame culture again thanks (at least in part) to changes in mating patterns over the course of several hundreds of years. evolution does not have to be unidirectional.
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anatoly karlin said:

“Ancient Greeks did a lot of abstract thinking, and produced the greatest cultural/scientific peak until the Renaissance (according to the same Charles Murray’s figures). During the Middle Ages, in pure scientific terms, the Islamic world was most advanced. The Renaissance began in northern Italy. Only in the 17th century did the bulk of scientific discoveries move to NW Europe.”

as i mentioned above, it looks like the ancient greeks (the athenians) went from inbred to outbred and back to inbred again. mind you, i only have some pretty slim historic/literary evidence for that, so you should take my claim with a large grain of salt, but i’ll keep working on the Greek Question. the romans, who were also pretty sharp, at least when it came to engineering, were very clearly outbred (they bequeathed their outbreeding practices to us). the renaissance did begin in northern italy, and that doesn’t come as a big surprise to me ’cause northern italy was the most heavily manorialized part of italy (i’ll tell you more about this in my long overdue series on manorialism). northern italians were also prboably quite outbred during the medieval period, although further research is required on that front, too. the scientific revolution, however — especially the development of the scientific method — was very much a north european baby, though. from what i understand of science in the medieval islamic world, most of that was down to the persians. can’t tell you anything about medieval persian society, unfortunately, ’cause i don’t know anything about it.

that’s it. outta energy. more soon!

(note: comments do not require an email. De revolutionibus orbium coelestium.)

spain’s north-south divide?

there appears to be a north-south divide in spain on several crucial metrics. for example, pisa scores (good proxy for iq scores/intelligence — see here and here):

spain - pisa scores and latitude

gdp per person (2012 — from here):

spain - gdp per person

poverty:

the speculation in hbd circles has long been that these differences have something to do with southern spain’s moorish history vs. northern spain’s visigothic, later catholic, one. but now, from the upcoming american society of human genetics conference, we have this:

spain

so, if this proves to be correct, the major genetic divide in spain is an east-west one, not a north-south one! as razib pointed out:

https://twitter.com/razibkhan/status/643188951491018752

why, then, the apparent north-south divide in spain (if it’s real)?

not sure. but there is another major difference between northern and southern spain, and that is in the traditional mating patterns/family types — southern spain is (traditionally) outside the hajnal line, while northern spain falls within it:

hajnal line

in other words, northern spain has for a long time been marked by the western european marriage pattern — i.e. late marriage, fewer children — whereas southern spain has not. from what i can tell, this late marriage pattern is found in those areas of europe in which bipartite manorialism was present during the medieval period, but i honestly don’t know if this holds for spain/the iberian peninsula. i shall endeavor to find out! jayman found, btw, that iq scores in europe correspond pretty well to the hajnal line — higher scores within, lower scores outside the line. this also appears to be the case in spain:

jayman's map + hajnal line

high historic rates of cousin marriage also tend to be present outside the hajnal line. historians generally agree that very close endogamous marriage practices were common in moorish spainfbd marriage even — and they continued right up into (at least) the sixteenth century.

perhaps regional differences in mating patterns/family types persisted in spain despite the movement of peoples during the reconquista. it could be that northerners who moved south through the country, replacing (or eventually outnumbering) the moors, adopted closer mating habits as they moved southwards. it wouldn’t be the first time, i don’t think, that a transplanted group adopted the marriage practices of the broader host population.

dunno. all still speculative at this point. watch this space! (^_^)

see also: Mapping The 2009 PISA Results For Spain And Italy from the reluctant apostate and IQ Ceilings? from jayman.

previously: northern vs. southern spanish iq, redux and la endogamia en la españa medieval and inbreeding in spain in the 19th & 20th centuries and big summary post on the hajnal line

(note: comments do not require an email. medieval spain.)

ashkenazi jews, mediterranean mtdna, mating patterns, and clannishness

here are a couple of thoughts on ashkenazi jews and the apparently high frequencies of mediterranean mtdna found in that population. i was going to include these in my response to prof. macdonald (prolly still will), but since that isn’t happening anytime soon, i thought i’d throw these out there. remember that these are just ideas, so don’t flip out on me!

if it’s correct that 80% of the mtdna of ashkenazi jews is of european — specifically mostly mediterranean, even more specifically very much italian — orgin, then it could very well have been that some male jews (traders?) from judea or alexandria married some roman women, either in or around rome or maybe even in southern gaul. as costa et al. proposed in their paper:

“Overall, it seems that at least 80% of Ashkenazi maternal ancestry is due to the assimilation of mtDNAs indigenous to Europe, most likely through conversion. The phylogenetic nesting patterns suggest that the most frequent of the Ashkenazi mtDNA lineages were assimilated in Western Europe, ~2 ka or slightly earlier. Some in particular, including N1b2, M1a1b, K1a9 and perhaps even the major K1a1b1, point to a north Mediterranean source. It seems likely that the major founders were the result of the earliest and presumably most profound wave of founder effects, from the Mediterranean northwards into central Europe, and that most of the minor founders were assimilated in west/central Europe within the last 1,500 years. The sharing of rarer lineages with Eastern European populations may indicate further assimilation in some cases, but can often be explained by exchange via intermarriage in the reverse direction….

“It is thought that a substantial Jewish community was present in Rome from at least the mid-second century BCE, maintaining links to Jerusalem and numbering 30,000–50,000 by the first half of the first century CE15. By the end of the first millennium CE, Ashkenazi communities were historically visible along the Rhine valley in Germany. After the wave of expulsions in Western Europe during the fifteenth century, they began to disperse once more, into Eastern Europe.

These analyses suggest that the first major wave of assimilation probably took place in Mediterranean Europe, most likely in the Italian peninsula ~2 ka, with substantial further assimilation of minor founders in west/central Europe. There is less evidence for assimilation in Eastern Europe, and almost none for a source in the North Caucasus/Chuvashia, as would be predicted by the Khazar hypothesis, — rather, the results show strong genetic continuities between west and east European Ashkenazi communities, albeit with gradual clines of frequency of founders between east and west….

The age estimates for the European founders might suggest (very tentatively, given the imprecision with present data) that these ancestral Jewish populations harboring haplogroup K and especially N1b2 may have had an origin in the first millennium BCE, rather than in the wake of the destruction of the Jerusalem Temple in 70 CE. In fact, some scholars have argued from historical evidence that the large-scale expansion of Judaism throughout the Mediterranean in the Hellenistic period was primarily the result of proselytism and mass-conversion, especially amongst women.”

just a reminder: the romans were outbreeders. they avoided cousin marriage. the proscriptions against cousin marriage were stronger earlier in the republican period than later, going from no marriage to third cousins or closer to first cousin marriage being allowed by the 200s b.c. but changes to mating patterns and people’s attitudes toward them take time. cosider how long it took for northern europeans to start following the church’s cousin marriage bans in the middle ages — around 300 years in the frankish kingdoms. also, cousin marriage is legal in germany today, and has been (mostly) since the days of luther, but cousin marriage rates remain very low. so i doubt if the roman cousin marriage rates shot up dramatically after the 200s b.c. (although you never know).

what i’m thinking is that the romans might have been quite okay with the idea of marrying their daughters off to some foreigners, especially since they didn’t have a tradition of marrying their cousins. jewish traders from the levant or wherever might not have had a hard time finding a nice roman girl to wed, either in rome itself or even in southern gaul perhaps. this could account for the “major wave of assimilation” in the north mediterranean that costa et al. think that they picked up in their mtdna analysis.

that only “minor founders” came from western/central europe might’ve had to do with the fact that northern europeans like the franks didn’t really start avoiding cousin marriage until the 800s, so they might not have been ready to marry some foreigners at all at that point. and that there was very little introgression whatsoever from eastern europeans should come as no surprise, given that it appears that eastern europeans continued to marry their cousins and be awfully clannish until quite late. when jews moved into eastern europe, they would’ve encountered a populace that barely intermarried between its own members, let alone with some outsiders.

if it’s correct that some jewish blokes married some roman chicks and then we got ashkenazi jews outta that combo AND if the theory of inbreeding/outbreeding/clannishness is right in any way (that’s two big ‘ifs’ there, in case you weren’t counting), then a funny thing to contemplate is that perhaps the jews who had moved northwards into germania in the very early part of the medieval period were some of the least clannish people up in that region, by virtue of the fact that they might’ve had a pretty heavy (outbred) roman ancestry while the northerners had barely begun to outbreed yet. i have to admit that this idea amuses me. (~_^) (just like the thought that much of the european introgression into african-americans likely came from the quite clannish ancestors of our southerners. heh.)

unfortunately, i don’t know what the mating patterns of jews in the levant (or elsewhere) looked like in second or first centuries b.c. not sure that we can guess by biblical proscriptions like those in leviticus either. those were from an earlier time, so it’s not certain they were being followed by our guys in italy. and there was a lot of behavioral variety among jews during this era, too — everything from hellenized jews to pharisees and sadducees, not to mention the jews who thought that jesus and his (universalistic) ideas were pretty cool, so i suspect that there must’ve been all sorts of mating patterns in the middle east at the time. so who knows how clannish (or not) the jews in rome were. no idea.

finally, icymi, i think the subsequent mating patterns of ashkenazi jews went like this. Further Research is RequiredTM.

in any case, mating patterns — and marriage traditions — matter.

see also: Genes Suggest European Women at Root of Ashkenazi Family Tree and Did Modern Jews Originate in Italy?

previously: what did the romans ever do for us? and historic mating patterns of ashkenazi jews

(note: comments do not require an email. roman jewish dude.)

polygamy, family types, and the selection for clannishness

i’ve been trying to think through polygamy and if there’s any potential there for the selection for clannishness like i think there is with long-term cousin marriage. (i think i might have sprained a parietal lobe while doing so. (*^_^*) ) i very much have subsaharan african societies in mind here, but, of course, polygamy occurs elsewhere, too.

on the surface it seems obvious that long-term polygamy ought to set the stage for the possible selection for clannish behaviors like cousin marriage (imho) does. like repeated cousin marriage, strict polygamy ought to narrow the relatedness within a population — the result of strict polygamy should be a greater number of half-siblings in a population than in a randomly-mating population, and, of course, half-siblings are more closely related to one another than non-siblings, so a society full of half-siblings could potentially lead to an accelerated selection for nepotistic altruism in a way similar to cousin marrying societies.

however, one big difference is that in polygamous societies generally — even in subsaharan african societies (where there’s a lot of polygamy) — people do not marry/mate with their half-siblings. (it does occasionally happen in some subsaharan societies, but only occasionally.) so, unlike in cousin-marriage societies, “genes for nepostistic altruism” (whatever they might be) might *not* become concentrated in family lineages. yes, there are a lot of half-siblings in polygamous societies, but any particular nepostistic altruism (“clannishness”) genes they might have (gotten from their fathers) will get diluted as they move out into the general population and marry non-relatives. if polygamy isn’t a driver of accelerated selection for nepotistic altruism (and i’ve rather persuaded myself that it isn’t), that could explain why subsaharan africans are generally pretty civic-minded, comparatively speaking. (the poor outcomes seen in african nations are perhaps more the result of other factors like low iq, high disease rates, etc., rather than clannishness. dunno. Further Research is RequiredTM.)

i should note here that polygamy in subsaharan africa is extremely variegated — in some societies, it’s typical for the first wife to actually be a cousin, and then the rest not. so there can be a layer of cousin marriage in amongst the polygamy. in other societies, cousin marriage is completely avoided. in yet other societies, the series of wives might be sisters (sororal polygyny), which makes all the offspring not only half-siblings (because they have the same father) but also cousins (because their mothers are sisters). here you would think that any selection for nepotistic altruism should very much be amplified. of course, in many subsaharan african societies — especially the polygamous ones — there’s often a lot of hanky-panky going on, so not all of the siblings will truly be half-siblings, etc. that’ll dilute your genes for nepotistic altruism right there.

another thing i also thought of regarding subsaharan and/or polygamous societies is the fact that all of the half-siblings don’t always grow up together. in patrifocal polygamous societies, yes — there you’ll have one man living with all of his wives (poor fellow!) and all of his kids, so all the half-siblings will be raised in the same place and interact with one another — and, presumably, continue to do so as adults. in matrifocal societies, a mother and her children reside with the mother’s family, not her husband and his family. this occurs in some polygamous societies, too.

it seems to me that, even if polygamy was a driver of accelerated selection for nepotistic altruism, such selection couldn’t possibly happen if the carriers of the clannishness genes don’t interact. if the half-siblings from polygamous unions don’t grow up together, or don’t interact much as adults, but rather with their (ordinary, i.e. not inbred) cousins, how would clannishness be selected for? it wouldn’t, i don’t think. or it wouldn’t be selected for in an amplified, accelerated way (which is what i think happens in the long-term cousin marriage scenario).

and that’s as far as i got with thinking through polygamy (i shall return to this topic, i’m sure). but thinking about the patrifocal vs. matrifocal family types got me to thinking about something else.

thought experiment: let’s say you eliminate cousin marriage from a population, but don’t eliminate the extended family. say you get rid of the inbreeding, but individuals continue to interact mostly with their close (extended) family members — more so than with the other members of society who are unrelated to them. you would think that it would take longer for clannishness to disappear — for “genes for nepostistic altruism” to get diluted in the population — than in a society where both cousin marriage AND the extended family were simultaneously eliminated.

i am, of course, talking about medieval western versus eastern europe here. the extended family was eliminated quite early in the middle ages in western europe via manorialism along with cousin marriage (serious changes to both were well underway in western europe by the 800s). in eastern europe, the cousin marriage bans appeared later simply because christianity had arrived later. and, especially the further east one goes (like into russia), the fewer pressures there were to eliminate the extended family. quite the opposite, really. for example, this was the situation in the baltic regions, including belorussia, in ca. the fifteenth century [pg. 440]:

a “…’kinship holding’, was collectively held by the extended family. Rural settlements often contained more than one kinship holding, and each holding was in turn subdivided among smaller households within the extended family….”

and in russia as late as the late seventeenth and early eighteenth centuries [pg. 444]:

“Russian manorialism was distinctive in several important ways…. In Russia…it was the peasant commune that allocated these taxes and obligations among the households. The village commune in Russia had emerged in the late seventeenth or early eighteenth centuries in response to increasing demands from the state and the landowning elite; peasant communes not only allocated obligations, but also chose their officials, held court, selected recruits for conscription levies, and kept written records of their activities. The communal clerk was sometimes the only member of his commune who could read and write….

“[O]n Russian manors, where hired labour was often not available, the peasant family had to personally perform labour obligations at the same time that it worked its own farm. This required large, often multi-generational, households with enough labour capacity to serve the simultaneous needs of both the manorial economy and the family farm…. As Steven Hoch has shown, however, life in the large household was hardly a rural idyll; household patriarchs formed a communal elite that ruled with despotic brutality, ruthlessly exploiting their families and denying any autonomy to the adults under them. At the same time, however, the large household also protected the peasant family from ruin.”

(hmmm. ever wonder where the russian love for [left-wing] authoritarianism comes from?)

even if eastern europeans/russians began to avoid cousin marriage around, say, 1000 (conversion to christianity), they didn’t quit residing in extended families and mostly interacting with their extended family members until, like, yesterday. (again, this pattern appears to be more pronounced the further east one travels.) so the dilution of nepotistic altruism genes in eastern european populations — via nepotistic behaviors being misapplied to individuals not sharing the same altruism genes (i.e. unrelated individuals) — didn’t happen as quickly as it did in western europe where people began regularly interacting with non-kin much earlier in the middle ages.

family types matter.

that’s all i’ve got for you for now. more soon! (^_^)

previously: start here and cousin marriage in sub-saharan africa and fulani, hausa, igbo, and yoruba mating patterns

(note: comments do not require an email. russian peasants.)

random notes: 06/30/15

further to the point of when did the arabs start marrying their fathers’ brothers’ daughters (fbd marriage), from kudelin (2005) – “Family-Matrimonal Relations in the 5th-7th Centuries Arabia and Their Reflection in the Early Arabic Poetry” [pgs. 8-9]:

“According to one point of view, in the 5th-7th century Arabia there was a decay of the communal-clan system which was reflected, in particular, in the ‘tendency towards isolation of a consanguine group by regulating family and matrimonial relations’ with the transformation of such group from an exogamic into an endogamous one. At that period the exogamic form of marriage was gradually losing its ‘oneness and ubiquity’ and edogamy was becoming firmly established. Obviously, during some period of time both forms of marriage coexisted simultaneously….

“Consistent introduction of paternal relations and the distribution of endogamy lead to such well-known form of matrimonial relations as [fbd] marriage which prevailed on the Arabic Peninsula from the 6th-7th century. In the conditions of the growing role of endogamy in this period the most suitable spouses in the Arabic society were ‘a son of an uncle on the father’s side’ (*ibn ‘amm*) and ‘a daughter of an uncle on the father’s side (*bint ‘amm*). If a girl did not have a first cousin, the right to marry her passed to the patrilineal cousins of further degrees. Usually the right did not pass further than the girl’s cousins of the third or fourth degrees…. In case of divorce, the right for the woman passed to other patrilineal cousins, beginning from the closest degree of kinship. An agnatic cousin had the right not to marry his relative, while she could not marry anyone else without his consent. An exterior competitor had to ask a patrilineal cousin for his permission and even pay him ‘compensation’….

“The coexistence of the exogamic and the endogamous forms of marriage in the 5th-7th century Arabia was reflected in the early Arabic poetry and determined its uniqueness.”

so it looks as though that, thanks to a quirky twist of history (the fall of the roman empire, perhaps?), the arabs adopted the form of cousin marriage that leads to the most inbreeding (fbd marriage) at just around the same time that europeans (especially northwest europeans) began to abandon cousin marriage altogether. how’s THAT for a clash of civilizations?!

there should be more on this here in robertson smith’s Kinship and Marriage in Early Arabia, which i haven’t looked at yet.
_____

around three or four hundred years after europeans started taking the medieval church’s cousin marriage bans seriously (ca. the 800s judging by the franks — ymmv), european languages shifted to reflect this change in mating patterns. a general term for “cousins” (and aunts and uncles) became the norm, replacing the older terms which specified “mother’s brother’s daughter” or whatever. it was no longer necessary to distinguish the “bint ‘amm” (father’s brother’s daughter in arabic) or “biǎo” cousins (cousins other than those descended from the father’s brother in chinese [mandarin?]) because all cousins were now off limits as far as marriage was concerned. this linguistic shift occurred between the twelfth and fifteenth centuries in german and also happened in english, french, etc. (interestingly, a similar linguistic shift happened in ancient greek, indicating…?)

the funny thing is, though, that the same linguistic shift also happened in italian, even though plenty of (especially southern) italians kept right on marrying their cousins — up until, like, yesterday. well, now i’ve stumbled across some historic regional differences in kinship terminology in italy. from “Land, Kinship, and Consanguineous Marriage in Italy From the Seventeenth To the Nineteenth Centuries” [pgs. 532-533]:

“In a rural town of Calabria in the province of Catanzaro, patrilateral parallel cousins were called *cugini giusti* (right cousins), or *surrea* and *frateu* in the case of the patrilateral parallel female and male cousins, respectively….

“At Prodo, in Umbria, we find virtually the same terminology as in Calabria. The strongest bond was between the males; patrilateral parallel cousins were called ‘brother-cousins,’ while others were simply called cousins….

“In Desulo, first cousins through brothers were known as *karrales*, and even second cousins, the sons of *karrales*, were referred to as *ermanos primargios*.”

so there you go. and there’s only something on the order of a million and one dialects in italy, so who knows how many different terms there might be for cousins in “italian” (and how those terms might differ regionally)?
_____

from anglo-saxon england, from the laws of wulfstan (d.1023), apparently the punishment (or one of the punishments) for violating the incest laws was a fine — a fine reckoned based upon how closely you were related to your partner in crime. sounds like it was a bit like applying some sort of wergeld calculation in order to try to enforce the cousin marriage bans. never heard this before [pg. 227]:

“There is particular concern and precision in the laws associated with Wulfstan: ‘if anyone commits incest, he is to pay compensation according to the degree of relationship, whether by wergeld or by fine or by all his possessions. It is not equal whether a man has intercourse with his sister, or with a more distant relation.’ Laws composed by Wulfstan prohibited marriage ‘within the sixth degree of relationship, that is within the fourth knee [*cneowe*]’, thus prohibiting marriage to fourth cousins, or marriage ‘with the widow of a man as nearly related to him as this’.”

huh.

(note: comments do not require an email. wulfstan.)