 (3) Finally, although the mapping conception gives us an abstract, formal conception of narrow content, it does not give us an algorithm for finding the narrow content of a particular state. Although apparently any function from contexts to contents would count as a “narrow content” in Fodor’s sense, some of these functions could not really be the content of a mental state. To use a computational analogy, we are really interested only in “computable” functions from context to content, functions that can be implemented somehow in a human mind, and this suggests that it is not the function itself that is of interest but rather the algorithm by means of which it is computed.