Kallai AY, Schunn CD, Fiez JA. Mental arithmetic activates analogic representations of internally generated sums. Neuropsychologia. 2012 Aug;50(10):2397-407. Epub 2012 Jun 23. PMID: 22732492 Date Published Saturday, December 31, 2011 Author(s) Christian Schunn, Ph.D. Julie Fiez, Ph.D.