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peter_hurford comments on Magic Tricks Revealed: Test Your Rationality - Less Wrong Discussion

31 Post author: peter_hurford 13 August 2011 05:23AM

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Comment author: peter_hurford 15 August 2011 03:59:51AM 0 points [-]

Right, I agree with you. Sorry about the "Zepton IV" thing, then.

But still, we do consider low-probability possibilities. So I'm still not sure what you meant by:

"Not even considering it at all" is what "dismissing due to low posterior weighting due to low prior weighting" feels like from the inside.

Comment author: Pavitra 16 August 2011 12:48:53AM 0 points [-]

I mean that when a human thinks they feel like they're "not even considering it at all", they actually are very slightly considering it.

Comment author: peter_hurford 16 August 2011 02:50:13AM 1 point [-]

How do you know that? I don't mean that in a "I think you're wrong" way, but in a "I think you're right, but I'm interested in knowing why" kind of way.

Comment author: Pavitra 16 August 2011 08:52:14PM 3 points [-]

Sometimes a human feels like they're not considering a hypothesis at all, and later starts considering it. That's not what confidence zero looks like.

Actually, humans do sometimes behave as though their confidence in a proposition was as close to zero as we're able to measure. I can't think of any non-politically-charged examples at the moment, but consider for example the sort of confusion that leads someone to ask "So are you Blue or Green?" of someone who's just finished explaining that they're Red.

Comment author: peter_hurford 17 August 2011 07:12:45AM 1 point [-]

That's what I would describe as someone not considering a hypothesis, and then later starting considering it. That is not what I would describe as someone subconsciously considering a hypothesis the entire time, at least without further justification.

Remember that not considering a hypothesis is not the same as saying the hypothesis has a low probability. Saying the hypothesis has a low probability is considering it and then discarding it. I think we're talking about two different things.

I can't think of any non-politically-charged examples at the moment, but consider for example the sort of confusion that leads someone to ask "So are you Blue or Green?" of someone who's just finished explaining that they're Red.

That reminds me of what Scott Adam's called The Two-Bucket Mind.