 The functional role of mental kinds is explained by some functionalists in terms of the modularity of the mind (Fodor 1983). This is the claim that the mind has different innate modules which play a certain functional role. These modules are domain-specific, operating only on certain kinds of inputs. So, for example, there will be distinct modules for mental tasks like mind-reading, speaker recognition and facial recognition. The functional role associated with mental kinds might for example be given an evolutionary account in terms of adapted modules (Cosmides and Tooby 1992). On this view, mental kinds in folk psychology are successful for the purposes of the explanation of human behaviour because they refer to the functional modules of the mind. Such views may motivate emergentism. One interpretation of the emergentist account of mind is that there are emergent mental kinds that have no straightforward correlation with the kinds identified by neuroscience. Nor are mental kinds and neurophysiological kinds either identical to or subkinds of one another; consequently emergentism is in conflict with the (contested) taxonomic hierarchy criterion (Criterion 5). (See the entry on  emergent properties.)