Scientific American:

In what may come as a surprise to freethinkers and nonconformists happily defying social conventions these days in New York City, Paris, Sydney and other centers of Western culture, a new study traces the origins of contemporary individualism to the powerful influence of the Catholic Church in Europe more than 1,000 years ago, during the Middle Ages.

According to the researchers, strict church policies on marriage and family structure completely upended existing social norms and led to what they call “global psychological variation,” major changes in behavior and thinking that transformed the very nature of the European populations.

The study, published this week in Science, combines anthropology, psychology and history to track the evolution of the West, as we know it, from its roots in “kin-based” societies. The antecedents consisted of clans, derived from networks of tightly interconnected ties, that cultivated conformity, obedience and in-group loyalty—while displaying less trust and fairness with strangers and discouraging independence and analytic thinking.

The engine of that evolution, the authors propose, was the church’s obsession with incest and its determination to wipe out the marriages between cousins that those societies were built on. The result, the paper says, was the rise of “small, nuclear households, weak family ties, and residential mobility,” along with less conformity, more individuality, and, ultimately, a set of values and a psychological outlook that characterize the Western world. The impact of this change was clear: the longer a society’s exposure to the church, the greater the effect.

Around A.D. 500, explains Joseph Henrich, chair of Harvard University’s department of human evolutionary biology and senior author of the study, “the Western church, unlike other brands of Christianity and other religions, begins to implement this marriage and family program, which systematically breaks down these clans and kindreds of Europe into monogamous nuclear families. And we make the case that this then results in these psychological differences.”

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