Single pulse TMS induced disruption to right and left parietal cortex on addition and multiplication

Elena Salillas, Carlo Semenza, Demis Basso, Tomaso Vecchi, Michael Siegal

Research output: Contribution to journalArticle


Whether or not mathematical operations are dependent on verbal codes in left hemisphere areas - particularly the left intraparietal sulcus - remains an issue of intense debate. Using single pulse transcranial magnetic stimulation directed at horizontal and ventral regions of the left and right intraparietal sulcus, we examined disruption to reaction times in simple addition and multiplication. Results indicate that these two operations differ in the pattern of lateralization across time for the two areas studied. These show that computational efficiency is not specifically dependent on left hemisphere regions and, in particular, that efficiency in multiplication is dependent on the ventral region of the intraparietal sulcus in the right hemisphere considered to be critical for motion representation and automatization.

Original languageEnglish
Pages (from-to)3159-3165
Number of pages7
Issue number4
Publication statusPublished - Feb 15 2012



  • Intraparietal sulcus
  • Mathematics
  • Verbal codes

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

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