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Impact Factor:0.906
Source:2014 Journal Citation Reports® (Thomson Reuters, 2015)

Savant-like Numerosity Skills Revealed in Normal People by Magnetic Pulses

  1. Allan Snyder,§
  2. Homayoun Bahramali§
  3. Tobias Hawker§
  4. D John Mitchell
  1. Centre for the Mind, Australian National University, Canberra, ACT 0200, Australia
  2. § University of Sydney, NSW 2006, Australia
  1. e-mail: allan{at}centreforthemind.com


Oliver Sacks observed autistic twins who instantly guessed the exact number of match-sticks that had just fallen on the floor, saying in unison “111”. To test the suggestion that normal individuals have the capacity for savant numerosity, we temporarily simulated the savant condition in normal people by inhibiting the left anterior temporal lobe of twelve participants with repetitive transcranial magnetic stimulation (rTMS). This site has been implicated in the savant condition. Ten participants improved their ability to accurately guess the number of discrete items immediately following rTMS and, of these, eight became worse at guessing as the effects of the pulses receded. The probability of as many as eight out of twelve people doing best just after rTMS and not after sham stimulation by chance alone is less than one in one thousand.

  • Received August 3, 2005.
  • Revision received October 19, 2005.
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