A Conversation with Joseph Henrich
An interesting article on Human evolution in “Edge.”
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.
I’ve also been trying to think broadly, and some of the big questions are, exactly when did this body of cumulative cultural evolution get started? Lately I’ve been pursuing the idea that it may have started early: at the origins of the genus, 1.8 million years ago when Homo habilis or Homo erectus first begins to emerge in Africa. Typically, people thinking about human evolution have approached this as a two-part puzzle, as if there was a long period of genetic evolution until either 10,000 years ago or 40,000 years ago, depending on who you’re reading, and then only after that did culture matter, and often little or no consideration given to a long period of interaction between genes and culture.
Of course, the evidence available in the Paleolithic record is pretty sparse, so another possibility is that it emerged about 800,000 years ago. One theoretical reason to think that that might be an important time to emerge is that there’s theoretical models that show that culture, our ability to learn from others, is an adaptation to fluctuating environments. If you look at the paleo-climatic record, you can see that the environment starts to fluctuate a lot starting about 900,000 years ago and going to about six or five hundred thousand years ago.
To read the complete article click on the link below:
http://edge.org/conversation/how-culture-drove-human-evolution