Scientists find the spot in the brain that activates with numerals
Stanford University School of Medicine researchers figured out the exact spot in the brain (about 1/5″ across!) gets activated when we look at ordinary numerals (like 3 or 52). The activity declines when people are shown numbers that are spelled out (“two”) or homophones (“too” instead of “two”) or slightly altered numbers or letters (changed font).
http://www.medicalnewstoday.com/releases/259221.php