Archives for posts with tag: boobies!

northern italy in the 1200s and “germany” in the 1500-1700s are just insane!:


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h/t 23andMe!

(edit: about the jello wrestling thing. (~_^) )

(note: comments do not require an email. boobies!)

in a previous post — the transition from shame to guilt in anglo-saxon england (and “core” europe) — i responded to a post by peter frost in which he argued that sentiments of guilt vs. shame in nw european populations, in particular anglo-saxon (i.e. english) society, go back to at least pre-christian anglo-saxon days. my response was that i think that’s unlikely — there’s no good evidence that feelings of guilt motivated the pre-christian anglo-saxons — and rather that innate feelings of guilt were selected for after the anglo-saxons (and other nw europeans) converted to christianity, and primarily because they quit marrying close relatives which triggered a whole chain of selection processes (if that’s the right way to put it).

peter wrote a part ii to his guilt vs. shame post — Origins of Northwest European guilt culture. Part II (go read it if you haven’t already!) — and this post is a response to that.
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in part ii, peter makes the argument that guilt in nw european populations goes way back to before the arrival of neolithic peoples in the region, and that the fact that there were large-sized, rather complex, semi-sedentary hunter-gatherer (fisher) populations in scandinavia and the baltic area meant that lots of non-kin individuals would’ve interacted with each other and, therefore, feelings of guilt could’ve arisen (read his post if you didn’t follow that — read it in any case, ’cause it is an interesting post!).

unfortunately, he doesn’t offer any evidence for a guilt culture existing in these societies. as far as i can tell, he just sorta assumes it:

“When did this guilt culture emerge? Historians usually link it to the rise of Protestantism, the expansion of the market economy, and the emancipation of the individual from the kin group, all of which happened — or are said to have happened — over the last thousand years. Yet there is compelling evidence for an earlier time frame. At the dawn of history, the peoples along the North Sea and the Baltic already had relatively loose kinship ties, a tendency toward prolonged celibacy, and a high level of circulation of non-kin individuals between households.

where is the evidence for these loose kinship ties, tendency toward prolonged celibacy, and high level of circulation of non-kin individuals between households? he does offer evidence for increased complexity in northern european mesolithic societies, but nothing about the kinship ties/celibacy/circulation of non-kin (unless i missed something -?-).

peter also presents the argument that, since the advance of the neolithic farmers stopped at the edges of where these mesolithic hunter-gatherers in scandinavia/the baltic region lived, that somehow the mesolithic hunter-gatherers were able to stop that advance by some collective action. possibly — but that doesn’t mean they had a guilt-based culture. and, anyway, the advance of neolithic peoples northwards and eastwards in europe seems to have stalled on more than one occasion, like in southeastern europe [pg. 34]:

“As had happened earlier in Greece, the expansion of farming communities into southeastern Europe went only so far and then stopped. The initial phase of rapid, long-distance colonizing movements was followed by consolidation. A frontier was established in Hungary south of Lake Balaton that persisted for at least five hundred years, about 6100-5600 BC…. When another wave of colonizing migrations began about 5600-5500 BC, carrying the farming and stockbreeding way of life over the Carpathians and into Poland, Germany, and France, the villages of southeastern Europe were already old and well established, and had a history of interconnection.”
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the reality of it is, late iron age/late antiquity/pre-christian northwestern european societies were not guilt-based. of the regions peter mentioned, the scandinavians were busy feuding between clans (their ætts) just like all the other germanic (and celtic) clans and tribes of pre-christian europe (stay tuned in the coming weeks for more on the scandis!). and the baltic populations — well, h*ll, they’re STILL barely guilt-based today (they’ve got the highest homicide rates in europe, some of the highest corruption levels, etc., etc.) — probably because the avoidance of close cousin marriage came really late to the baltic region. if mesolithic northern european societies had been guilt-based (and there’s not much evidence that they were), that guilt was long gone by the iron age.

again, peter said:

When did this guilt culture emerge? Historians usually link it to the rise of Protestantism, the expansion of the market economy, and the emancipation of the individual from the kin group, all of which happened — or are said to have happened — over the last thousand years.

the historians are right — or they are sorta right. northwestern (my “core”) european guilt culture emerged not because of the rise of protestantism — that was just the flowering of it — but, rather, had its roots several centuries before that in the early medieval period (see previous post).

the center of the guilt culture in northwestern europe — the core region which (historically anyway) has been characterized by the least corruption, the highest levels of trust, liberal democracy, free societies, low levels of internal violence, high levels of human accomplishment, the invention of capitalism, the advancement of science, the development of the ideas and ideals of the enlightenment, and pretty much everything else we call western civilization today — is the core where The Outbreeding Project began the earliest in europe. here is that core encircled (roughly) in green right here on this map for you (quite possibly denmark and parts of northern italy should be included, too — i’ll keep you posted on that) — the hajnal line represents the outer limits of The Outbreeding Project and the rise of western europe’s guilt culture:

hajnal line - core europe

see these previous posts — mating patterns of the medieval franks and going dutch — for more about the history of mating patterns/The Outbreeding Project in this core region.

we are in The 10,000 Year Explosion territory here. in fact, we are more in the neighborhood of “Natural History of Ashkenazi Intelligence.” human evolution did not slow down or stop since the rise of culture and civilization — our natures of today were not wholly shaped in the paleolithic — human evolution has, in fact, sped up since the agricultural revolution. and, with strong enough selective pressures, human evolution can happen in ca. 40-50 generations. this is what we’ve got in core europe since the early medieval: ca. 48-52 generations, counting generations at a conservative 25 years in length.

no, i haven’t proven either that the medieval Outbreeding Project in europe led to the guilt culture of northwest europeans (it’s just a theory!), but the circumstantial evidence for the presence of a guilt culture (lack of corruption, low internal violence, etc.) does seem to match the boundaries of The Outbreeding Project awfully well. (^_^)
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p.s. – here’s something that i wrote to someone in an email recently that sums the situation up:

“The connection here, I believe, is in length of time spent outbreeding — and there is also a connection between length of time outbreeding and the Hajnal line. Michael Mitterauer examined and explained this latter connection in chapters two and three of his Why Europe? (I HIGHLY recommend reading the book): during the medieval period, the economy of most of the region that falls within the Hajnal Line was based upon manorialism, and this manor system ‘pushed’ for both outbreeding and late marriage (the late marriage part was Hajnal’s discovery). It also ‘pushed’ for nuclear families.

“The idea of avoiding cousin marriage in Europe was, indeed, one first proposed by the Roman Catholic church, but it really became important — and was implemented to its fullest extent — under the manor system. This is why the range of outbreeding coincides almost perfectly with the Hajnal line: with the expansion of the manor system eastwards across the continent during the medieval period, ideas about cousin marriage — and, indeed, all sorts of Roman Catholic practices — went with it. That expansion stopped in the east when it ran up against the wall of Slavs and vast forests. (This is all covered by Mitterauer.)

“Manorialism also failed to reach all sorts of other areas in Europe where the heavy plow and large agricultural fieds were not practical: the mountainous regions of Italy and Greece, for instance….

“[O]n the whole, yes, Eastern Europeans converted to Christianity quite a bit later than many of the groups in Western Europe. The Russians converted in the late-900s, which is just so very different from the Franks who converted around 500 a.d. That’s a four hundred year delay in any possible implementation of any cousin marriage bans amongst the Kievan Rus vs. the Franks! Complete conversion of the entire populations and the implementation of cousin marriage bans would also have taken time, of course — for instance, I showed in a recent post that, although the Catholic Church banned cousin marriage in the early 500s, the practice of avoiding cousin marriage probably didn’t fully take hold amongst the Franks until the 700-800s. I would imagine that there were similar delays, too, in Eastern Europe — and, in fact, in one post I quoted some evidence that there may have been quite a bit of ‘flip-flopping’ in Russia when it came to enforcing the cousin marriage bans during the medieval period. Again, this is likely due to the fact that the manor system was not in place in Eastern Europe and, so, it just wasn’t considered as necessary to enforce the cousin marriage bans and/or the infrastructure just wasn’t there to properly implement enforcement.

“A curious area of Europe — which I plan on looking into next on the blog — is Scandinavia. They converted to Christianity comparatively late (ca. 1000 a.d.), however, at least in Sweden, they enforced the cousin marriage bans for longer than other Protestant nations. Most of the Protestant nations dropped the cousin marriage bans around the time of the Reformation, but the Lutheran church in Sweden kept prohibiting cousin marriage until the mid-1800s! Oddly, too, cousin marriage doesn’t really seem to have increased much in the Protestant nations after the Reformation — I suppose social norms meant that people just continued to mostly avoid marrying their close cousins. Old habits die hard. (~_^)”

previously: the transition from shame to guilt in anglo-saxon england (and “core” europe)

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men have been trying to figure out what to do about (us) women for…well, for millennia, apparently!

here is the poet semonides of amorgos writing about the fair sex in the seventh century b.c. (he must’ve had a HORRIBLE wife, if he was married at all). see if you can recognize any of these types (~_^) …

From the start, the gods made women different.
One type is from a pig–a hairy sow
whose house is like a rolling heap of filth;
and she herself, unbathed, in unwashed clothes,
reposes on the shit-pile, growing fat. (5)
Another type the gods made from a fox:
pure evil, and aware of everything.
This woman misses nothing: good or bad,
she notices, considers, and declares
that good is bad and bad is good. Her mood (10)
changes from one moment to the next.
One type is from a dog–a no-good bitch,
a mother through and through; she wants to hear
everything, know everything, go everywhere,
and stick her nose in everything, and bark (15)
whether she sees anyone or not.
A man can’t stop her barking; not with threats,
not (when he’s had enough) by knocking out
her teeth with a stone, and not with sweet talk either;
even among guests, she’ll sit and yap; (20)
the onslaught of her voice cannot be stopped….

Another type a horse with flowing mane
gave birth to. She avoids all kinds of work
and hardship; she would never touch a mill
or lift a sieve, or throw the shit outside,
or sit beside the oven (all that soot!). (60)
She’ll touch her husband only when she has to.
She washes off her body every day
twice, sometimes three times! then rubs herself
with perfumed oil. She always wears her hair
combed-out, and dressed with overhanging flowers. (65)
Such a wife is beautiful to look at
for others; for her keeper, she’s a pain
–unless he is a king, or head of state
who can afford extravagant delights….

Another type is from a bee. Good luck
in finding such a woman! Only she (85)
deserves to be exempt from stinging blame.
The household that she manages will thrive;
a loving wife beside her loving man,
she’ll grow old, having borne illustrious
and handsome children; she herself shines bright (90)
among all women. Grace envelops her.
She doesn’t like to sit with other women
discussing sex. Zeus gratifies mankind
with these most excellent and thoughtful wives.

But by the grim contrivances of Zeus (95)
all these other types are here to stay
side by side with man forever. Yes,
Zeus made this the greatest pain of all:
Woman.

If she seems to want to help
that’s when she does her keeper the most harm. (100)
A man who’s with a woman can’t get through
a single day without a troubled mind.
He’ll never banish Hunger from his house:
unwelcome, hateful lodger, hostile god.
Just when a man seems most content at home (105)
and ready for enjoyment, by the grace
of god or man, that’s when she’ll pick a fight,
her battle-helmet flashing, full of blame.
A household with a woman is at a loss
to give a decent welcome to a guest. (110)
The wife who seems the most restrained and good,
she’s the most disastrous of them all;
for while her slack-jawed husband gapes at her
the neighbors laugh at how he’s been deceived.
Each man will diligently praise his own (115)
and blame the next man’s wife; we just don’t see
that we all share alike in this hard luck.
For Zeus made this the greatest pain of all
and locked us in a shackle hard as iron
and never to be broken, ever since (120)
the day that Hades opened up his gates
for all the men who fought that woman’s war.

“that woman” was helen, of course.

i didn’t quote the whole poem. you can read it in its entirety here.

(i have been spending waaaay too much time @chateau heartiste. (~_^) )

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i took this table from the recent pew survey of muslims

honor killings permissible - pew 2013

…and made a couple of maps (adapted from this map).

the first one is a map of the differences between what percentage of muslims in each country responded that honor killing is never justifiable when a man commits an offense versus a woman committing an offense. a plus number (+) means more enthusiasm for honor killing women — a negative (-), men. here it is (click on image for LARGER view):

map of expansion of caliphate - pew honor killings diffs

what i think we can see is that, the closer you get to the arab expansion epicenter (the arab peninsula), the greater the enthusiasm for honor killing women. so in jordan it’s +47, lebanon and egypt +10, iraq +11. but when you get out to the edges of the caliphate, the differences are not so great, or they are in fact reversed: morocco -1, turkey and afghanistan and tajikistan 0. even pakistan is only +3. when you get way out to uzbekistan and kyrgyzstan, then the numbers are reversed: -14 and -3.

(it should be noted that for some reason the question was worded differently in uzbekistan, afghanistan, and iraq. everyone else was asked specifically about premarital sex/adultery and family honor, while the uzbekis, afghanis, and iraqis were only asked about family honor. see questions 53 and 54 here [pdf].)

i think that perhaps this is a reflection of what korotayev noticed, i.e. that father’s brother’s daughter (fbd) marriage is found in those places of the world that were a part of the eighth century muslim caliphate, because those populations wanted to emulate the arabs, and the arabs practiced fbd marriage. the reason that the populations on the edges of the caliphate are less enthusiastic about honor killing women is that they were arabized less and/or later than (dare i say it) the “core arabs” and so probably have been practicing fbd marriage for a shorter amount of time. (in fact, korotayev and other russian anthropologists suggest that fbd marriage started in the levant and moved southwards into the arab peninsula, so some of the jordanians and lebanese may have started practicing fbd marriage before the arabs down in the peninsula.)

i think, too, that there is a connection between fbd marriage and honor killings, because fbd marriage leads to greater inbreeding, and greater amounts of inbreeding may very probably lead to greater frequencies of “genes for altruism” — and honor killings can be viewed as a sort-of upside-down-and-backwards form of altruism (at least they seem that way to us).

and/or the arabs simply introduced some crazy “genes for upside-down-and-backwards altruism” to these various populations, and less so on the fringes presumably because not so many arabs actually made it that far. edit: also interesting to note is that in fbd societies, all of the men in extended families/clans share the same y-chromosome. if there is a connection between violence and some gene(s) on the y-chromosome (i thought greg cochran said something about this, but i can’t find it now), maybe this is exacerbated by fbd marriage.

here is the other map — the percentage of muslims in each country responding that it is rarely, sometimes, or often justified to honor kill women:

map of expansion of caliphate - pew honor killings women

again, the numbers taper off on the edges of the extent of the caliphate.

previously: father’s brother’s daughter’s marriage and inclusive inclusive fitness and who wants sharia?

(note: comments do not require an email. many, many boobies!)

pew has just released the results of their latest survey of muslims around the world (in 39 different countries).

here’s a map showing the percentage of muslims in each country that would like sharia to be the law of their land (click on map for LARGER image – should take you to the pew site):

who wants sharia - pew 2013

the iraqs, afghanis, and pakistanis all seem pretty eager for sharia — they’re all in the 75-100% range. the moroccans, too. and the palestinian territories.

this is a large report from pew, so have a look at the whole thing yourself.

here’s something else that i found particularly interesting:

honor killings permissible - pew 2013

of the countries that think that honor killing is more justified when women commit an offense than when men do — russia, albania, azerbaijan, bangladesh, pakistan, jordan, iraq, egypt, lebanon, tunisia, and the palestinian territories — a majority of them (7 out of 11) have a preference for father’s brother’s daughter’s (fbd) marriage — pakistan, jordan, iraq, egypt, lebanon, tunisia, and the palestinian territories.

i don’t know what, if any, form of cousin marriage is preferred in azerbaijan or bangladesh. paternal cousin marriage, which would include fbd marriage, is avoided in places like chechnya and (at least among some peoples in) dagestan (russia in this survey?) and albania. the difference in the responses in albania was not very great (+1 point), but the difference in russia(?) was statistically significant at +7 points. it’s difficult to know who these “russian” muslims are (maybe the info is in an appendix somewhere — i’ll have to look), so i don’t know if they’re the chechens and/or some dagestanis and/or some other group(s) — and, so, i don’t know what their mating patterns are.

i’m surprised that afghanistan breaks even. i would’ve predicted that they would be like the other fbd marriage groups.

it’s interesting that some of the central asian “stans” — kyrgyzstan and uzbekistan — swing in the opposite direction. a greater number of people feel that honor killings are more justified against men who break the rules than women. i don’t know much of anything about these populations, but i did read a bit just the other day, and it seems that they have a preference for maternal cousin marriage. (note that i don’t have a good idea what the rates might be.)

previously: inclusive inclusive fitness

(note: comments do not require an email. many boobies!)

Born to run: genetic test can reveal those best able to run marathons“[T]o run a marathon in a good time requires the right combination of genes and that nearly a fifth of the population lack this special mix. For runners with the right genes, it means their bodies can quickly adapt to carry large amounts of oxygen to their muscles, allowing them to run faster and for longer. Those who lack these genes, however, will never improve, no matter how much they train, and their performance may even get worse the harder they push themselves.”

Scientists Breed Exercise-Crazy Rats“While a wide biological gap exists between humans and rats, the researchers do propose that some people could be genetically predisposed against exercising.”

Genetic discovery found to influence obesity in people of African ancestry

New Studies Shake Up Human Family Tree“[I]n a spate of new studies, paleoanthropologist Lee Berger, of the University of the Witwatersrand, and a team of collaborators have put forward a controversial claim that another hominin — *Australopithecus sediba* — might be even closer to the origin of our lineage [than *australopithecus afarensis,* the most famous example being "lucy"]….” — see also: Special Collection – Australopithecus sediba @science.

Fish Fossil Shows Why Humans Have Two Arms, Legs

Castaways“We may have yet another story of long-distance prehistoric contact. A new paper in PLOS genetics suggests that people from the Jomon culture in Japan may have reached northwestern South America.” – from greg cochran. also from south america: Southern Native American Y-DNA: no correlation with language – @for what they were…we are.

Fluctuation of Fertility with Number in a Real Insect Population and a Virtual Population“Real fruit fly fertility increases with average consanguinity thus decreasing with population size in a pattern that is modelled successfully with a virtual population. This invites the deliberate manipulation of wild insect populations for the control of vectors of human disease.” – from our very own linton herbert! yay! (^_^)

Do drugs for bipolar disorder ‘normalize’ brain gene function? U-M study suggests so“Brain tissue study shows gene expression in patients treated with antipsychotics is similar to expression in non-bipolar brains.”

Serenity“If the realities of human nature render your hope on how to make a better world impossible, merely wishing it were not so is not going to help your cause. But instead, better results can be attained to by working *with* what we learn about human nature.” – from jayman. hear, hear!

HVGIQ: Dominican Republic – from jason malloy.

Napoleon Chagnon’s “Noble Savages” – The Life of an Anthropological Heretic“Napoleon Chagnon’s ‘Noble Savages’ is a must read.” – from helian unbound.

Frequent texters more shallow, racist, study finds – w.e.i.r.d. students. (psychology students, no less! (~_^) ) also: Texting, social networking and other media use linked to poor academic performance.

Study: we assume people stare at us“People often think that other people are staring at them even when they aren’t, vision scientists have found. In a new article in Current Biology, researchers at The Vision Centre reveal that, when in doubt, the human brain is more likely to tell its owner that they’re under the gaze of another person.”

Political organization in a hunter-gatherer tribe – @mangan’s.

First Encounters of the Close Kind: John Derbyshire’s Address To The 2013 American Renaissance Conference – from john derbyshire.

Jared Taylor Remembers Philippe Rushton and Arthur Jensen

Our Inconsistent Ethical Instincts – read also: The Pro-Death Movement from jim goad – “[T]here’s an almost universal human definition of good and evil: If it enhances my survival, it’s good. If it harms it, it’s evil.” – yup.

Individual Donation Amounts Drop When Givers Are in Groups, Says MU Researcher“Numerous studies have provided evidence that people are less likely to help when in groups, a phenomenon known as the ‘bystander effect.’” – see also this old post from steve sailer: Chinese kindness.

The Fraud Of America’s “Rape Culture” – from anatoly. see also his earlier post Much Ado About Rape: Quantifying A Big Taboo“[I]t is ironic that the public panic over rape and sexual assault has risen to fever pitch at precisely the moment in history when the real lifetime risk of becoming a victim of rape has never been lower.”

Monkey chatter smacks of human speech, researcher says

How Parents Around the World Describe Their Children, in Charts“A fascinating new study reveals that Americans are more likely to call their children ‘intelligent,’ while European parents focus on happiness and balance.”

DNA Shows It: Birds Are Promiscuous“Here’s the warm and fuzzy part of this column: most birds really do mate for life. But here’s the cold side: They mess around. And here’s the switch: Blame the ladies.”

How to blackmail your parents for food“Fledglings extort food by putting themselves in danger.”

When Animals Mourn: Seeing That Grief Is Not Uniquely Human – cr*p. i hate sad animal stories. *sniff*

Hawking: Humans Will Not Survive Another 1,000 Years ‘Without Escaping’ Earthmanifest destiny!

In Defence of Pseudonyms in Science: Defending the Right to Write

bonus: read this!>> Sam Parnia – the man who could bring you back from the dead“This British doctor specialises in resurrection and insists outdated resuscitation techniques are squandering lives that could be saved.”

bonus bonus: James Lovelock: A man for all seasons – lovelock thinks there are too many people on the planet.

bonus bonus bonus: and this week’s “bras in the news” stories >> Bras Make Breasts “Saggier”, 15-year French [of course! - h.chick] Study Reveals and How your under-wired bra could kill you… if you’re a keen walker“Metal in under-wired bras can cause compasses to be reversed because of the magnetic effect”. (sorry, no naked boobies at either of those pages.)

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for those of us who prefer to think about things in pictures/drawings/pie charts/hieroglypics rather than numbers (*hbd chick frantically raises her hand in the back of the classroom*), anonymous commenter pointed out this wikipedia page on structural endogamy to me (thanks, anonymous commenter! (^_^) ).

here, at long last, are a bunch of people diagramming mating patterns. ACTUAL mating patterns from real world examples. in detail.

below, for instance, are what the mating patterns — and the resultant connections between the members of the group — in a turkish nomadic clan look like (i haven’t read about this specific example yet, but i’m going to assume that this diagram represents a case of regular preferred father’s brother’s daughter’s [fbd] marriage since that’s pretty common amongst turkish nomadic clans):

structural endogamy - turkish nomad clan

the nodes that you see there, i.e. the colored dots, are married couples, not individuals. as you can see, this is a very tightly related clan with nearly everyone being connected somehow to the two founding couples. there’s a tight “core” to this clan, but it does expand in later generations simply due to the increase in the number of its members.

here’s a more detailed diagram of what i think must be the same turkish clan:

structural endogamy - turkish nomad clan 02

yeah. complicated!

and here’s a different mating pattern altogether mapped out. this is from a mexican village in which anything closer than, and including, marriage to a second cousin was not allowed (sounds like the influence of christianity to me, but i could be wrong about that), however marriage within the village was preferred (the village was studied in the late 1970s and the authors describe it as having been in a transitional phase in between a traditional nahuatl way of life and a more modern mestizo stage):

structural endogamy - belen mexico

as you can see, everyone’s still connected since most people married within the village, but the relationships are not as close as in the more closely inbreeding turkish clan. neat!

i’m sure i’ll be looking further into this structural endogamy or (marital) relinking as it’s also sometimes called. there’s even a whole book on the subject!

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i’ve inserted phillpotts’ “end of the germanic kindreds” dates on top of ralph and coop’s “mean within-country ibd rates” map — just ’cause i could. here’s what it looks like:

coop et al - mean within-country ibd rates + phillpotts' kindreds 03

the idea is that greater inbreeding ought to lead to greater “clannishness” — i.e. a greater prevalence of kindreds in the case of the germanics, and kindreds for longer the longer the inbreeding happened — while outbreeding ought to lead to less “clannishness.”

this map maybe kinda/sorta shows that (i think).

if you look at, for instance, the region from france through belgium and up through the netherlands towards dithmarschen (the black square on the map and “ground zero” for clannishness amongst the medieval germanic populations), the pattern does seem to hold: where there are lower ibd rates (i.e. suggesting lower inbreeding), as in northern france, the kindreds disappeared earlier (1300s) than where there are higher ibd rates, namely friesland (1400s). and the ibd rates increase the closer you get towards dithmarschen.

germany, too, has low ibd rates (relatively small green circle centered on berlin there — smaller than friesland’s circle), and, according to phillpotts, kindreds were pretty much gone in central/southern germany by the 1200s.

and norway has lower ibd rates than sweden, and the kindreds disappeared there sooner (1200s) than in sweden (1300s).

i would’ve predicted lower ibd rates for england, especially now given what phillpotts said about the kindreds in anglo-saxon england being gone by the 600-700s — although perhaps that had to do with their migration over water like she suggested and wasn’t related to whether or not they were inbreeding or outbreeding at the time. on the other hand, lorraine lancaster argued that kindreds were actually still around in england into the 1000s, so perhaps that explains the ibd rates a bit better — or vice versa, rather (but see below).
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btw, i looked a little further into the sources of the genetic data that ralph and coop used for their ibd study [pdf]. the data came from popres (The Population Reference Sample), and afaict (correct me if i’m wrong) the european data in the popres collection came from two sources: the london-based Lolipop Study and the swiss-based CoLaus study.

the lolipop study surveyed both indian asian and white european individuals living in london [pdf] — i’m sure ralph and coop used only the white european individuals for their study of europe, of course. only europeans having four grandparents born in the u.k. were included, so i guess that must make them all british (english, welsh, scottish, northern irish) — but they could also be irish. the inclusion of welsh, scottish, and/or irish individuals could’ve skewed the ibd results. ralph and coop seem to have isolated some number of scottish and irish individuals (see their map above), but it’s not clear to me if those individuals were from the lolipop study or the colaus one.

the colaus study looked at caucasians living in lausanne, switzerland, who were either swiss or from another european(?) country. both the subjects’ parents and grandparents had to have been born in whatever country they were described as coming from. the researchers tried to further narrow down their ethnicity during a clinical visit. i presume it was from this study that ralph and coop drew the rest of their samples, including the data from: germany, france, belgium, the netherlands, norway, and sweden — possibly england, too. it’s difficult to know because they don’t spell it all out specifically. these data could be skewed, too, for my purposes — for example, hypothetically speaking, due to the presence of a lot of non-french, but still european, individuals in the set of samples of france. again, difficult to know.

finally, here are the numbers of individuals from each country sampled by ralph and coop. some of them are kinda low — like n=2 for norway:

coop et al - mean within-country ibd rates - popres data samples

previously: ibd and historic mating patterns in europe and medieval germanic kindreds … and the ditmarsians

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