The British Psychological Society reports that 15 minutes of low frequency transcranial magnetic stimulation, or TMS, can cause enhanced counting abilities similar to Dustin Hoffman counting the toothpicks in Rainman.
Original publication: Snyder, A., Bahramali, H., Hawker, T. & Mitchell, D.J. (2006). Savant-like numerosity skills revealed in normal people by magnetic pulses. Perception, 35, 837-845.
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