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Neural Circuits01:25

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Three parietal circuits for number processing.

Stanislas Dehaene1, Manuela Piazza, Philippe Pinel

  • 1INSERM-CEA, Service Hospitalier Frederic Joliot, Orsay, France.

Cognitive Neuropsychology
|October 20, 2010
PubMed
Summary
This summary is machine-generated.

Evolution may have predisposed the human brain for numbers. The horizontal segment of the intraparietal sulcus (HIPS) shows domain-specific quantity processing, supported by verbal and attentional circuits.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • The human brain's capacity for numerical representation is debated.
  • The parietal lobe is implicated in quantity processing but also other functions.
  • Understanding number representation in the parietal lobe is crucial.

Purpose of the Study:

  • To clarify the organization of number-related processes in the parietal lobe.
  • To investigate the potential domain specificity of numerical representations.
  • To propose a model for how different brain regions contribute to numerical cognition.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) to examine brain activity during numerical tasks.
  • Analysis of the three-dimensional intersection of fMRI activations.
  • Review of relevant neuropsychological evidence.

Main Results:

  • The horizontal segment of the intraparietal sulcus (HIPS) shows systematic activation during number manipulation, independent of notation.
  • Activation in HIPS increases with greater emphasis on quantity processing, suggesting domain specificity.
  • A tripartite organization is proposed: HIPS for quantity, left angular gyrus for verbal processing, and posterior superior parietal areas for attentional orientation.

Conclusions:

  • The HIPS is a strong candidate for a domain-specific quantity processing system.
  • This core system is supplemented by verbal and attentional circuits depending on task demands.
  • The brain utilizes distinct but interconnected regions for different aspects of numerical cognition.