Suppose that the organism is given the problem of determining the analysis of a stimulus at a certain level of representation- e. g., the problem of determining which sequence of words a given utterance encodes. Since, in the general case, transducer outputs underdetermine perceptual analyses, we can think of the solution of such problems as involving processes of nondemonstrative inference. In particular, we can think of each input system as a computational mechanism which projects and confirms a certain class of hyputheses on the basis of a certain body of data.

p. 126, partly cited in: Meredith Williams (2002) Wittgenstein, Mind, and Meaning: Toward a Social Conception of Mind. p. 104. Quote about the direction of information flow in perceptual and observer analysis. - Modularity of Mind (1983)