 The mental representation view of concepts is the default position in cognitive science (Carey 2009, Pinker 2007) and enjoys widespread support in the philosophy of mind, particularly among philosophers who view their work as being aligned with research in cognitive science (e.g., Carruthers 2006, Millikan 2000, Fodor 2003, Margolis &amp; Laurence  2007).[1]  Supporters of this view argue for it on explanatory grounds. They maintain that concepts and structured mental representations play a crucial role in accounting for the productivity of thought (i.e., the fact that human beings can entertain an unbounded number of thoughts), in explaining how mental processes can be both rational and implemented in the brain, and in accommodating the need for structure-sensitive mental processes (Fodor 1987; see also the entry  language of thought hypothesis).