Trapped Priors As A Basic Problem Of Rationality - a podcast by Jeremiah

https://astralcodexten.substack.com/p/trapped-priors-as-a-basic-problem

Introduction and review

Last month I talked about van der Bergh et al’s work on the precision of sensory evidence, which introduced the idea of a trapped prior. I think this concept has far-reaching implications for the rationalist project as a whole. I want to re-derive it, explain it more intuitively, then talk about why it might be relevant for things like intellectual, political and religious biases.

To review: the brain combines raw experience (eg sensations, memories) with context (eg priors, expectations, other related sensations and memories) to produce perceptions. You don’t notice this process; you are only able to consciously register the final perception, which feels exactly like raw experience.

Or: maybe you feel like you are using a particular context independent channel (eg hearing). Unbeknownst to you, the information in that channel is being context-modulated by the inputs of a different channel (eg vision). You don’t feel like “this is what I’m hearing, but my vision tells me differently, so I’ll compromise”. You feel like “this is exactly what I heard, with my ears, in a way vision didn’t affect at all”.

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