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Cerebral activations during number multiplication and comparison: a PET study

S Dehaene1, N Tzourio, V Frak

  • 1Laboratoire de Sciences Cognitives et Psycholinguistique, EHESS, CNRS, Paris, France. stan@lscp.msh-paris.fr

Neuropsychologia
|November 1, 1996
PubMed
Summary

This study used positron emission tomography (PET) to map brain activity during number tasks. Both multiplication and comparison engaged similar brain regions, but distinct networks were observed for each cognitive process.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Understanding the neural basis of mathematical cognition is crucial.
  • Previous research suggests distinct brain networks for different numerical operations.

Purpose of the Study:

  • To investigate the cerebral networks involved in number comparison and mental multiplication.
  • To identify overlapping and distinct brain activations for these two numerical tasks.

Main Methods:

  • Positron emission tomography (PET) was employed to measure cerebral blood flow.
  • Eight healthy volunteers underwent scanning during rest, mental multiplication, and number comparison tasks.
  • Anatomical regions of interest were defined using magnetic resonance imaging (MRI).

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Main Results:

  • Both multiplication and comparison activated bilateral lateral occipital cortices, left precentral gyrus, and supplementary motor area.
  • Multiplication uniquely engaged bilateral inferior parietal gyri, left fusiform/lingual gyri, and right cuneus.
  • Comparison showed greater activation in the right superior temporal gyrus and bilateral middle temporal gyri compared to multiplication.

Conclusions:

  • Bilateral inferior parietal regions play a significant role in number processing.
  • Mental multiplication and number comparison rely on partially distinct neural networks.