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Brendan de Kenessey's avatar

In a typical philosopher's fashion, I wonder whether there might be two different distinctions in this area. One is between arational and rational behavior, the other is between instrumental and non-instrumental behavior. As you acknowledge, arational behavior can be instrumental - I think the clearest example is acting on addictive cravings, which often shows very sophisticated means-end planning in order to get one's fix.

More interesting for your post is the non-instrumental rational category: behavior that's guided by rational processes but not in a means-end structure. The clearest example to me here is our use of language: when I'm in conversation (or typing this post), my word choice isn't guided by at least explicit means-end reasoning. But it's not arational either. It's instead guided rationally by the non-instrumental norms of conversation - norms of grammar, Grice-style norms of pragmatics, epistemic norms, etc. I think any activity guided by constitutive norms - games, dances, maybe stand-up comedy! - is going to show this structure.

I suspect these two distinctions are genuinely cross-cutting, in the sense that both our instrumentally and non-instrumentally structured behaviors are sometimes driven by automatic, arational processes and sometimes by controlled rational processes. One last interesting thing: often these two are not opposed but go hand in hand. Again language is my go-to example: when I'm lecturing, I'm often struck by how automatic and involuntary the process that constructs my sentences is. But - at least hopefully! - my lecture is a rational activity.

Thanks for a very thought-provoking post, as usual!

Noah Birnbaum's avatar

I enjoyed this a lot. Two points I would make.

1) Even the seemingly irrational reaction can be rational In some cases - either because it is the only thing you can do given your emotional state (which I think is rational if ought implies can) or if doing so would relieve you of the emotional distress (perhaps in a lot of cases, this isn’t properly accounting for the cost-benefit analysis, however).

2) From my understanding, philosophers don’t often claim that we are descriptively means-end machines (though let me know if you think I am wrong about that); they claim that we ought to be as that is what you would do under more ideal reflection. I think very few people would disagree that there are often motivational constraints blocking us from achieving what we want, for example.

If I’m misunderstanding or mischaracterizing your argument, let me know!

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