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Functional Mapping with Simultaneous MEG and EEG
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Published on: June 14, 2010

[Activated brain areas during simple and complex mental calculation--a functional MRI study].

Zeng-Qiang Zhang1, Si-Yun Shu, Song-Hao Liu

  • 1Department of Neurology, Zhujiang Hospital Affiliated to Southern Medical University, Guangzhou 510280, China.

Sheng Li Xue Bao : [Acta Physiologica Sinica]
|August 12, 2008
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Functional magnetic resonance imaging (fMRI) reveals that both the brain cortex and subcortical structures are activated during mental calculation. Complex calculations specifically engage the right parietal lobe, suggesting its role in visuospatial processing.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Mental calculation involves complex cognitive processes.
  • Understanding the neural basis of mathematical cognition is crucial.
  • Previous studies have implicated various brain regions, but the roles of subcortical structures require further elucidation.

Purpose of the Study:

  • To investigate brain activation patterns during simple and complex mental calculations using fMRI.
  • To determine the involvement of both cortical and subcortical brain structures in numerical cognition.
  • To explore differences in brain activation between simple and complex arithmetic tasks.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed on 16 healthy volunteers.
  • A block-design paradigm included simple (single-digit) and complex (multi-digit) addition/subtraction tasks, alongside a baseline task.
  • Statistical parametric mapping (SPM99) was used for data processing and localization of activated brain areas.

Main Results:

  • Both cortical and subcortical structures, including the basal ganglia and thalamus, showed activation during mental calculation.
  • Common brain regions activated across tasks included the frontal lobe, parietal lobe, occipital lobe, cingulate gyrus, thalamus, and cerebellum.
  • The right parietal lobe was uniquely activated during complex calculations, suggesting a role in visuospatial processing.

Conclusions:

  • Mental calculation engages a distributed network of both cortical and subcortical brain regions.
  • Subcortical structures like the caudate nucleus, globus pallidus, and striatum are critical for numerical processing.
  • The right parietal lobe's activation in complex tasks highlights its involvement in visuospatial memory and processing during demanding calculations.