SOURCE: EDGE
HOW CULTURE DROVE HUMAN EVOLUTION
[JOSEPH HENRICH:] The main questions I've been asking myself over the last couple years are broadly about how culture drove human evolution. Think back to when humans first got the capacity for cumulative cultural evolution—and by this I mean the ability for ideas to accumulate over generations, to get an increasingly complex tool starting from something simple. One generation adds a few things to it, the next generation adds a few more things, and the next generation, until it's so complex that no one in the first generation could have invented it. This was a really important line in human evolution, and we've begun to pursue this idea called the cultural brain hypothesis—this is the idea that the real driver in the expansion of human brains was this growing cumulative body of cultural information, so that what our brains increasingly got good at was the ability to acquire information, store, process and retransmit this non genetic body of information.
We've begun to pursue this idea called the cultural brain hypothesis—the idea that the real driver in the expansion of human brains was this growing cumulative body of cultural information.
Culture is part of our biology.
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We now have the neuroscience to say that culture's in our brain, so if you compare people from different societies, they have different brains. Culture is deep in our biology. We have people with different cultural backgrounds that have different hormonal reactions as well as having different brains on the MRI scan. So culture is just part of our biology, and we shouldn't take this dualistic view that there's this realm of ideas that somehow are separate from this realm of biology, and you're either talking about the realm of ideas or the realm of biology. Cognition and our ability to think are all interwoven, and we're a cultural species, which means one of our genetic programs is to be able to acquire ideas, beliefs and values and weave them into our brain such that they then affect our biology. A good example of this is the placebos. Placebos are something that depend on your cultural beliefs. If you believe that something will work, then when you take it, like you take an aspirin or you take a placebo for an aspirin, it initiates the same pathways as the chemically active substance. Placebos are chemically inert but biologically active, and it's completely dependent on your cultural beliefs. If you don't believe that cures come in pills, then taking a placebo aspirin does not have any effect on you. That's a case where it shows the ability of a cultural belief to activate biological processes, and then it's something we know a little bit about.
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