I can't speak to the accuracy of the studies he's quoting here, but Derek Sivers talks about this in a post on his blog (https://sivers.org/zipit https://sivers

I can't speak to the accuracy of the studies he's quoting here, but Derek Sivers talks about this in a post on his blog (https://sivers.org/zipit https://sivers.org/zipit). Central quotes: "Once you've told people of your intentions, it gives you a “premature sense of completeness.”" "You have “identity symbols” in your brain that make your self-image. Since both actions and talk create symbols in your brain, talking satisfies the brain enough that it “neglects the pursuit of further symbols.”" But, as others have pointed out, what Alex is talking about is (I believe) more of a list for your own benefit, rather than a publicly-shared list.