“…So far studies on how finger counting habits interact with mathematics performance have mostly focused on children and adults without diagnosed disabilities. As we discussed earlier, children with mathematics learning difficulties have a harder time transitioning from finger counting to verbal counting and retrieval strategies (Bryant, 2005;Geary, 2004;Jordan & Hanich, 2000;Jordan et al, 2008) For example, patients diagnosed with autism (Gunter, Ghaziuddin, & Ellis, 2002), ADHD (Roessner, Banaschewski, Uebel, Becker, & Rothenberger, 2004), dyslexia (von Plessen et al, 2002), and developmental language disorder (Herbert et al, 2004) were found to have abnormalities in the size and function of their corpus callosum (the sets of nerve fibers connecting the left and right hemispheres; see van der Knaap & van der Ham, 2011 for a review) and lateralization patterns. It is possible that the abnormalities with corpus callosum, which affect interhemispheric communication, lead to differences in finger counting habits as well.…”