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Single-digit arithmetic processing-anatomical evidence from statistical voxel-based lesion analysis.

Urszula Mihulowicz1, Klaus Willmes2, Hans-Otto Karnath3

  • 1Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen Tübingen, Germany ; Department of Diagnostics and Cognitive Neuropsychology, Institute of Psychology, University of Tübingen Tübingen, Germany.

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Summary

Basic arithmetic processing relies on specific brain regions, primarily in the left hemisphere. Different brain areas are involved in multiplication/addition versus subtraction, highlighting distinct neural pathways for numerical cognition.

Keywords:
arithmeticarithmetic factsfiber pathwayslesion analysisnumber processingstroke patients

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • The neural underpinnings of basic arithmetic operations (addition, subtraction, multiplication) remain incompletely understood.
  • Previous research has proposed various mechanisms for single-digit arithmetic, but consensus on neural correlates is lacking.

Purpose of the Study:

  • To investigate the neural correlates of basic single-digit arithmetic operations.
  • To examine the impact of circumscribed left- and right-hemispheric brain lesions on arithmetic performance.

Main Methods:

  • Systematic assessment of single-digit arithmetic in acute stroke patients (n=45) with localized brain lesions.
  • Analysis of lesion sites in relation to performance deficits in addition, subtraction, and multiplication.

Main Results:

  • Impaired arithmetic performance was significantly associated with lesions in the left hemisphere.
  • Deficits in multiplication and addition were linked to distinct subcortical/white matter regions compared to subtraction deficits.
  • Evidence suggests separate neural pathways for different arithmetic operations.

Conclusions:

  • The left hemisphere plays a crucial role in basic arithmetic processing.
  • Distinct neural substrates support different types of arithmetic operations, such as multiplication/addition versus subtraction.
  • Investigating white matter fiber pathways is essential for understanding numerical cognition.