Velorien comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapters 105-107 - Less Wrong

6 Post author: b_sen 17 February 2015 01:17AM

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Comment author: Velorien 18 February 2015 03:29:48PM 1 point [-]

But Quirrell's justification RE Parseltongue was "snakes can't lie". So if we believe his explanation to begin with, we must assume that normal snake-talk is equally trustworthy.

Comment author: jkaufman 18 February 2015 08:08:26PM *  2 points [-]

Another possibility is that snakes can't lie (lying depends on some brain feature they lack) and Parselmouthing people can't lie (part of how it works) but a snake animagus is neither and so can lie.

Comment author: TobyBartels 19 February 2015 08:07:54AM 0 points [-]

FWIW, I'm pretty sure that EY would endorse the claim that lying depends on a brain feature that snakes lack. Lying in the sense of deliberate deception requires a theory of mind of the one being deceived, and snakes aren't that intelligent, or so I believe that EY believes (and for that matter believe myself).

OTOH, snakes aren't intelligent enough to talk either; in HPMOR, they only do so by borrowing the mind of the Parseltonguer. And Parseltonguers can conceive of other minds, both for the benefit of snakes and for their own speech. So this doesn't prove anything.

Comment author: jkaufman 20 February 2015 02:36:50PM 1 point [-]

Lying in the sense of deliberate deception requires a theory of mind of the one being deceived, and snakes aren't that intelligent ...

Yes, I'm pretty sure that's EY's model.

But a snake animagus doesn't have a snake brain; you keep your normal mind while you're an animagus.

Comment author: TobyBartels 20 February 2015 06:02:24PM *  2 points [-]

Yes, I agree. So if Quirrel were deliberately trying to mislead, ‘Snakes can't lie.’ would be a great statement to use.

Comment author: jkaufman 18 February 2015 03:59:14PM 0 points [-]

Or it's almost all truth with one crucial lie.