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Cortical dynamics during simple calculation processes: A magnetoencephalography study.

Mutsumi Iijima1,2, Nobuyuki Nishitani1,3

  • 1Department of Sensory & Communicative Disorders, Research Institute, National Rehabilitation Center for the Disabled, Tokorozawa, Japan.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • Understanding the neural basis of mathematical cognition is crucial.
  • Simple calculation involves complex cognitive processes.
  • Previous studies have used various neuroimaging techniques with limitations in temporal or spatial resolution.

Purpose of the Study:

  • To elucidate the active cortical areas and their temporal dynamics during simple calculation.
  • To investigate the hemispheric lateralization of brain activity during calculation.
  • To utilize whole-scalp magnetoencephalography (MEG) for high temporal and spatial resolution.

Main Methods:

  • Twelve healthy volunteers performed figure viewing, digit viewing, and single-digit addition tasks.
  • Whole-scalp magnetoencephalography (MEG) using a 122-channel neuromagnetometer was employed.
  • Analysis focused on identifying activated brain regions and their activation timings.

Main Results:

  • Occipital, temporal, and left superior temporal areas (STA) showed activation during all tasks around 250 ms.
  • Calculation-specific activity was localized to the inferior parietal area (IPA) and STA.
  • The left IPA and STA exhibited significantly earlier and stronger activation compared to the right hemisphere counterparts.

Conclusions:

  • Simple digit addition is primarily processed in the left IPA and STA.
  • Subsequent recognition of calculation results involves the right IPA and STA.
  • The study highlights the dominant role of the left hemisphere in early calculation stages and the right in later recognition processes.