pragmatist comments on The Useful Idea of Truth - Less Wrong

77 Post author: Eliezer_Yudkowsky 02 October 2012 06:16PM

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Comment author: Eliezer_Yudkowsky 02 October 2012 05:28:00AM 23 points [-]

(The 'Mainstream Status' comment is intended to provide a quick overview of what the status of the post's ideas are within contemporary academia, at least so far as the poster knows. Anyone claiming a particular paper precedents the post should try to describe the exact relevant idea as presented in the paper, ideally with a quote or excerpt, especially if the paper is locked behind a paywall. Do not represent large complicated ideas as standard if only a part is accepted; do not represent a complicated idea as precedented if only a part is described. With those caveats, all relevant papers and citations are much solicited! Hopefully comment-collections like these can serve as a standard link between LW presentations and academic ones.)

The correspondence theory of truth is the first position listed in the Stanford Encyclopedia of Philosophy, which is my usual criterion for saying that something is a solved problem in philosophy. Clear-cut simple visual illustration inspired by the Sally-Anne experimental paradigm is not something I have previously seen associated with it, so the explanation in this post is - I hope - an improvement over what's standard.

Alfred Tarski is a famous mathematician whose theory of truth is widely known.

The notion of possible worlds is very standard and popular in philosophy; some of them even ascribe much more realism to them than I would (since I regard them as imaginary constructs, not thingies that can potentially explain real events as opposed to epistemic puzzles).

I haven't particularly run across any philosophy explicitly making the connection from the correspondence theory of truth to "There are causal processes producing map-territory correspondences" to "You have to look at things in order to draw accurate maps of them, and this is a general rule with no exception for special interest groups who want more forgiving treatment for their assertions". I would not be surprised to find out it existed, especially on the second clause.

Added: The term "post-utopian" was intended to be a made-up word that had no existing standardized meaning in literature, though it's simple enough that somebody has probably used it somewhere. It operates as a stand-in for more complicated postmodern literary terms that sound significant but mean nothing. If you think there are none of those, Alan Sokal would like to have a word with you. (Beating up on postmodernism is also pretty mainstream among Traditional Rationalists.)

You might also be interested in checking out what Mohandas Gandhi had to say about "the meaning of truth", just in case you were wondering what things are like in the rest of the world outside the halls of philosophy departments.

Comment author: pragmatist 02 October 2012 10:53:43PM *  12 points [-]

I haven't particularly run across any philosophy explicitly making the connection from the correspondence theory of truth to "There are causal processes producing map-territory correspondences" to "You have to look at things in order to draw accurate maps of them, and this is a general rule with no exception for special interest groups who want more forgiving treatment for their assertions". I would not be surprised to find out it existed, especially on the second clause.

Depends on what you mean by "explicitly". Many correspondence theorists believe that an adequate understanding of "correspondence" requires an understanding of reference -- how parts of our language are associated with parts of the world. I think this sort of idea stems from trying to fill out Tarski's (actual) definition of truth, which I discussed in another comment. The hope is that a good theory of reference will fill out Tarski's obscure notion of satisfaction, and thereby give some substance to his definition of truth in terms of satisfaction.

Anyway, there was a period when a lot of philosophers believed, following Saul Kripke and Hilary Putnam, that we can understand reference in terms of causal relations between objects in the world and our brains (it appears to me that this view is falling out of vogue now, though). What makes it the case that our use of the term "electron" refers to electrons? That there are the appropriate sorts of causal relations, both social -- the causal chain from physicists who originated the use of the word to contemporary uses of it -- and evidential -- the causal connections with the world that govern the ways in which contemporary physicists come to assert new claims involving the word "electron". The causal theory of reference is used as the basis for a (purportedly) non-mysterious account of satisfaction, which in turn is used as the basis for a theory of truth.

So the idea is that the meanings of the elements in our map are determined by causal processes, and these meanings link the satisfaction conditions of sentential functions to states of affairs in the world. I'm not sure this is exactly the sort of thing you're saying, but it seems close. For an explicit statement of this kind of view, see Hartry Field's Tarski's Theory of Truth. Most of the paper is a (fairly devastating, in my opinion) critique of Tarski's account of truth, but towards the end of section IV he brings up the causal theory.

ETA: More broadly, reliabilism in epistemology has a lot in common with your view. Reliabilism is a refinement of early causal theories of knowledge. The idea is that our beliefs are warranted in so far as they are produced by reliable mechanisms. Most reliabilists I'm aware of are naturalists, and read "reliable mechanism" as "mechanism which establishes appropriate causal connections between belief states and world states". Our senses are presumed to be reliable (and therefore sources of warrant) just because the sorts of causal chains you describe in your post are regularly instantiated. Reliabilism is, however, compatible with anti-naturalism. Alvin Plantinga, for instance, believes that the sensus divinitatis should be regarded as a reliable cognitive faculty, one that atheists lack (or ignore).

One example of a naturalist reliabilism (paired with a naturalist theory of mental representation) is Fred Dretske's Knowledge and the Flow of Information. A summary of the book's arguments is available here (DOC file). Dretske tries to understand perception, knowledge, the truth and falsity of belief, mental content, etc. using the framework of Shannon's communication theory. The basis of his analysis is that information transfer from a sender system to a receiver system must be understood in terms of relations of law-like dependence of the receiver system's state on the sender system's state. He then analyzes various epistemological problems in terms of information transfer from systems in the external world to our perceptual faculties, and information transfer from our perceptual faculties to our cognitive centers. He's written a whole book about this, so there's a lot of detail, and some of the specific details are suspect. In broad strokes, though, Dretske's book expresses pretty much the same point of view you describe in this post.