CCC comments on How minimal is our intelligence? - Less Wrong
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Given that the neolithic revolution happened in more than one place, I don't see how it could be a very significant filter. Or are you referring to "civilization" in a sense not achieved by the Incans or the Aztecs? It's interesting to wonder how far the Aztecs & subsequent civilizations could've gone if they hadn't been interrupted by the Europeans.
That just means that the right conditions were a worldwide (or close to worldwide) phenomenon on Earth. This does not imply that the right conditions for the development of civilisation are necessarily common given the right conditions for the formation of intelligent life.
Unfortunately, we only have one example of a planet having the right conditions for the formation of intelligent life. Drawing statistical inferences from a single example is not a good idea.