The brain uses three distinct circuits to process and manipulate numbers
In short: Researchers investigating how the brain handles math found that numerical processing is not confined to a single area. By analyzing fMRI activations during various numerical tasks and reviewing neuropsychological evidence, they identified a tripartite organization within the parietal lobe where different regions specialize in handling quantity, verbal symbols, and spatial attention.
The study suggests that while one core region handles pure quantity—similar to an internal number line—it is supported by two other systems: one managing numbers expressed as words and another helping orient attention toward numerical values. The researchers reached these conclusions by examining the three-dimensional intersection of fMRI activations across different tasks.
Why it matters: Numerical processing relies on a specialized core quantity system supplemented by verbal and spatial circuits.
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Sources
- Summary by Intellect · source: Research: Dehaene et al. (2003). THREE PARIETAL CIRCUITS FOR NUMBER PROCESSING. Cognitive Neuropsychology.
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