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dthunt comments on Rationality Quotes June 2014 - Less Wrong
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It's reasonable to update as a result of the analysis of fiction (including fanfiction) for two reasons, neither of which are directly related to the events of the story in the same way that events in real life are related to updating. The first is: does this prompt me to think in a way I did not before? If so, it is not evidence, but it allows you to better way the evidence by providing you with more possibilities. The second is: why was this written? Even a truthless piece of propaganda can be interesting evidence in that it is entangled with human actions and motivations.
If considering a new hypothesis fundamentally changes the way you think about priors, and the arguments you used to justify ratios between hypotheses no longer hold, then, yes, you will have to look at the evidence again.
I feel a little odd about calling that process 'updating', since I think it's a little more involved than taking into account a single new piece of evidence.