This might be of some interest: Savant-like numerosity skills revealed in normal people by magnetic pulses http://www.centreforthemind.com/publications/Savant

This might be of some interest: Savant-like numerosity skills revealed in normal people by magnetic pulses http://www.centreforthemind.com/publications/SavantNumerosity.pdf http://www.centreforthemind.com/publications/SavantNumerosit...