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In 1974, San Francisco newspaper heiress Patty Hearst was kidnapped by a radical group called the Symbionese Liberation Army, whose goals included “death to the fascist insect that preys upon the life of the people.” After being kept in a closet for a while, she came to identify with her new peer group. Before long, she was enthusiastically helping them generate income, at one point brandishing a machine gun during a bank robbery. When left alone, with an opportunity to escape, she didn’t take it.
She later described the experience: “I had virtually no free will until I was separated from them for about two weeks. And then it suddenly, you know, slowly began to dawn that they just weren’t there anymore. I could actually think my own thoughts.” Hearst didn’t just accept her captors’ “subjective” beliefs, such as ideology; she bought into their views about how the physical world works. One of her captors “didn’t want me thinking about rescue because he thought that brain waves could be read or that, you know, they’d get a psychic in to find me. And I was even afraid of that.”
Hearst’s condition of coerced credulity is called the Stockholm syndrome, after a kidnapping in Sweden. But the term “syndrome” may be misleading in its suggestion of abnormality. Hearst’s response to her circumstances was probably an example of human nature functioning properly; we seem to be “designed” by natural selection to be brainwashed.
Some people find this prospect a shocking affront to human autonomy, but they tend not to be evolutionary psychologists. In Darwinian terms, it makes sense that our species could contain genes encouraging blind credulity in at least some situations. If you are surrounded by a small group of people on whom your survival depends, rejecting the beliefs that are most important to them will not help you live long enough to get your genes into the next generation.
Confinement with a small group of people may sound so rare that natural selection would have little chance to take account of it, but it is in a sense the natural human condition. Humans evolved in small groups—twenty, forty, sixty people—from which emigration was often not a viable option. Survival depended on social support: sharing food, sticking together during fights, and so on. To alienate your peers by stubbornly contesting their heartfelt beliefs would have lowered your chances of genetic proliferation.
Maybe that explains why you don’t have to lock somebody in a closet to get a bit of the Stockholm syndrome. Religious cults just offer aimless teenagers a free bus ride to a free meal, and after the recruits have been surrounded by believers for a few days, they tend to warm up to the beliefs. And there doesn’t have to be some powerful authority figure pushing the beliefs. In one famous social psychology experiment, subjects opined that two lines of manifestly different lengths were the same length, once a few of their “peers” (who were in fact confederates) voiced that opinion.
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