By carefully analyzing brain activity, scientists can tell what number a person has just seen, research now reveals. They can similarly tell how many dots a person was presented with. Past investigations had uncovered brain cells in monkeys that were linked with numbers. Although scientists had found brain regions linked with numerical tasks in humans - the frontal and parietal lobes, to be exact - until now patterns of brain activity linked with specific numbers had proven elusive....
http://www.livescience.com/health/090925-brain-numbers.html
http://www.livescience.com/health/090925-brain-numbers.html