Andrew U. Frank. Distinctions Produce a Taxonomic Lattice: Are These the Units of Mentalese?. In Brandon Bennett, Christiane Fellbaum, editors, Formal Ontology in Information Systems, Proceedings of the Fourth International Conference, FOIS 2006, Baltimore, Maryland, USA, November 9-11, 2006. Volume 150 of Frontiers in Artificial Intelligence and Applications, pages 27-38, IOS Press, 2006.