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Dissociating prefrontal and parietal cortex activation during arithmetic processing.

V Menon1, S M Rivera, C D White

  • 1Department of Psychiatry & Behavioral Sciences, Stanford University School of Medicine, Stanford, California 94305, USA.

Neuroimage
|September 16, 2000
PubMed
Summary
This summary is machine-generated.

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This study reveals the brain

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Cognitive Psychology

Background:

  • Previous studies implicated prefrontal and parietal cortices in arithmetic.
  • The precise role of these regions in calculation versus other cognitive operations remained unclear.

Purpose of the Study:

  • To identify brain areas uniquely contributing to numerical computation using functional magnetic resonance imaging (fMRI).
  • To dissociate brain activity related to arithmetic complexity from general task difficulty.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Task difficulty was manipulated by varying the number of operands and stimulus presentation rate.
  • A factorial design was used to isolate the effects of arithmetic complexity and presentation rate.

Related Experiment Videos

Main Results:

  • Increased task difficulty led to quantitative changes in prefrontal and parietal cortex activation, recruiting caudate and midcerebellar regions.
  • The left and right angular gyrus showed a main effect of arithmetic complexity.
  • The left insular/orbitofrontal cortex showed a main effect of stimulus presentation rate.

Conclusions:

  • Findings demonstrate a functional dissociation within prefrontal and parietal cortices during arithmetic processing.
  • Evidence suggests a specific role for the angular gyrus in arithmetic computation, independent of other cognitive demands.