There’s a cliche, which isn’t totally false, that more education tends to lead one toward heterodox viewpoints which challenge conventional norms. But one issue that has been coming to the fore over the last 10 years or so is that college educated Americans tend toward social liberalism, and yet often continue to live very bourgeois lives. In other words, the freedoms which they favor are those freedoms which are ever operative in their own lives. In contrast those Americans without college educations tend to have a less libertarian attitude toward personal mores, but have lives characterized by greater disturbance and disastrous choices.
And yet this does not hold in the case of what articles such as this report, How Divorce Lost Its Groove:
Though she wasn’t entirely surprised. Ever since her divorce three years ago, Ms. Thomas said, she has been antisocial, “nervous about what people would say.”
After all, she had gone from Park Slope matron, complete with involved husband (“We had cracked the code of Gen X peer parenthood”) and gut-renovated brownstone, to “a Red Hook divorcée,” she said, remarried with a new baby and two children-of-divorce barely out of preschool. “All of a sudden, this community I’d lived in for 13 years became this spare and mean savannah,” she said.
It was as if, she said, everyone she knew felt bad for her but no one wanted to be near her, either. Even though adultery was not part of the equation, Ms. Thomas said, “I feel like I have a giant letter A on my front and back.
The standard argument for why there is aversion to incest among humans as matter of innate disposition is the Westermarck effect, which is a model where aversion to mating emerges if you are raised with an individual of the opposite sex. Some basic illustrations are sketched out in The Blank Slate: The Modern Denial of Human Nature. But some comments below make me wonder if there is are alternative explanations. Robin Fox has made the claim, repeated in many places, that cousin marriage was ubiquitous in the human past:
I saw this link posted on twitter, IQ and Human Intelligence:
An interesting finding from genetic research, which Mackintosh mentions, only in passing, as posing a problem in the estimation of the heritability of g, is that there is greater assortative mating for g than for any other behavioral trait; that is, spouse correlations are only ∼.1 for personality and only ∼.2 for height or weight, but the correlation for assortative mating for g is ∼.4. In addition to indicating that people are able to make judgments about g in real life, this finding suggests that assortative mating may contribute to the substantial additive genetic variance for g, because positive assortative mating for a character can increase its additive genetic variance.
I’ve seen these sort of results before. The review is from 1999. In general I always wonder if quantitative values for personality are not to be trusted because of issues with the measurement of personality types. But this is clearly not an issue with height or weight. And in the case of height the overwhelming causal explanation for variation in the West is genetic variation. Overall I’m rather surprised by the rather low correlations for some of these traits, such as height and intelligence. I wonder if beauty, perhaps measured by an index of facial symmetry, might exhibit higher correlation values?
The map above shows the distribution of consanguineous marriages. As you can see there’s a fair amount of cross-cultural variation. In the United States there’s a stereotype of cousin marriage being the practice of backward hillbillies or royalty. For typical middle class folk it’s relatively taboo, with different legal regimes by state. The history of cousin marriage in the West has been one of ups & downs. Marriage between close relatives was not unknown in antiquity. The pagan emperor Claudius married his niece Agrippina the Younger, while the Christian emperor Heraclius married his niece Martina. Marriage between cousins were presumably more common. With the rise in the West of the Roman Catholic Church marriages between cousins were officially more constrained. Adam Bellow argues in In Praise of Nepotism: A Natural History that there’s a material explanation for this: the Roman church used its power over the sacrament of marriage to control the aristocracy. Though the church required dispensations for marriages between cousins of even distant degrees of separation, they were routinely given, as was obviously the case among Roman Catholic royal families like the Hapsburgs. But once given the dispensation could be revoked, rendering the marriage null and void. A highly convenient power politically.