On the input problem for massive modularity

Jerry Fodor argues that the massive modularity thesis - the claim that (human) cognition is wholly served by domain specific, autonomous computational devices, i.e., modules - is a priori incoherent, self-defeating. The thesis suffers from what Fodor dubs the 'input problem': the function of a given module (proprietarily understood) in a wholly modular system presupposes non-modular processes. It will be argued that massive modularity suffers from no such a priori problem. Fodor, however, also offers what he describes as a 'really real' input problem (i.e., an empirical one). It will be suggested that this problem is real enough, but it does not selectively strike down massive modularity - it is a problem for everyone.