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According to standard teleosemantics, intentional states are selectional states. This claim is put forward not as a conceptual analysis, but as a ‘theoretical reduction’—an a posteriori hypothesis analogous to ‘water = H2O’. Critics have tried to show that this meta-theoretical conception of teleosemantics leads to unacceptable consequences. In this paper, I argue that there is indeed a fundamental problem with the water/H2O analogy, as it is usually construed, and that teleosemanticists should therefore reject it. Fortunately, there exists a viable alternative to the water/H2O model which avoids the fundamental problem, while explaining the a posteriori character of teleosemantics equally well.

Fred Dretske’s account of mental causation, developed in Explaining Behavior and defended in numerous articles, is generally regarded as one of the most interesting and most ambitious approaches in the field. According to Dretske, meaning facts, construed historically as facts about the indicator functions of internal states, are the structuring causes of behavior. In this article, we argue that Dretske’s view is untenable: On closer examination, the real structuring causes of behavior turn out to be markedly different from Dretske’s meaning facts. Our argument proceeds in three steps. First, we set forth the problem of meaning individuation: We argue that the proposal that meaning facts are structuring causes of behavior commits Dretske to a very fine-grained individuation of meanings that is deeply counterintuitive. In a second step, we show that even these finely individuated meaning facts cannot do the job that they are supposed to do, since information facts—which are constitutive of, but distinct from Dretske’s meaning facts—are better candidates for the role of structuring causes. Finally, we argue that it is not even information facts, but facts of co-instantiation which are the real structuring causes of behavior. In concluding, we briefly consider the options that are left for Dretske if our arguments succeed.