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Sideways comments on Five-minute rationality techniques - Less Wrong
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'Instinct,' 'intuition,' 'gut feeling,' etc. are all close synonyms for 'best guess.' That's why they tend to be the weakest links in an argument-- they're just guesses, and guesses are often wrong. Guessing is useful for brainstorming, but if you really believe something, you should have more concrete evidence than a guess. And the more you base a belief on guesses, the more likely that belief is to be wrong.
Substantiate your guesses with empirical evidence. Start with a guess, but end with a test.
I disagree with this one. If it's really your best guess, it should be the result of all of the information you have to muster. And so either each of "instinct", "intuition", "gut feeling", etc. are your best chance of being right, or they're not close synonyms for "best guess".
I agree (see, e.g., The Second Law of Thermodynamics, and Engines of Cognition for why this is the case). Unfortunately, I see this as a key inferential gap between people who are and aren't trained in rationality.
The problem is that many people-- dare I say most-- feel no obligation to gather evidence for their intuitive feelings, or to let empirical evidence inform their feelings. They don't think of intuitive feelings as predictions to be updated by Bayesian evidence; they treat their intuitive feelings as evidence.
It's a common affair (at least in the United States) to see debaters use unsubstantiated intuitive feelings as linchpins of their arguments. It's even common on internet debates to see whole chains of reasoning in which every link is supported by gut feeling alone. This style of argument is not only unpersuasive to anyone who doesn't share those intuitions already-- it prevents the debater from updating, as long as his intuitions don't change.
Intuitive feelings are evidence AND predictions. Sadly, most people simply think of them as facts.