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Developmental dyscalculia and brain laterality

R S Shalev1, O Manor, N Amir

  • 1Neuropediatric Unit, Shaare Zedek Medical Center, Jerusalem, Israel.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|June 1, 1995
PubMed
Summary
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Children with developmental dyscalculia (DD) show arithmetic deficits linked to brain laterality. Left hemisphere dysfunction in DD leads to more profound arithmetic impairment compared to right hemisphere dysfunction.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Educational Psychology

Background:

  • Developmental dyscalculia (DD) is a learning disorder affecting arithmetic skills.
  • Brain laterality, or hemisphere specialization, plays a role in cognitive functions, including mathematics.

Purpose of the Study:

  • To investigate the correlation between arithmetic dysfunction and brain laterality in children with DD.
  • To compare the severity of arithmetic impairment based on the affected brain hemisphere.

Main Methods:

  • Studied 25 children diagnosed with developmental dyscalculia (DD).
  • Administered a standardized arithmetic battery and conducted neurological and neuro-psychological evaluations.
  • Classified participants into left (n=13) or right (n=12) hemisphere dysfunction groups based on specific neurological and cognitive criteria.

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Main Results:

  • Both left and right hemisphere dysfunction groups exhibited significant arithmetic deficits.
  • Children with left hemisphere dysfunction showed significantly worse performance in addition/subtraction, complex multiplication/division, and visuo-spatial errors.
  • Arithmetic impairment was more profound in the group with left hemisphere dysfunction.

Conclusions:

  • Dysfunction in either brain hemisphere negatively impacts arithmetic acquisition in children with DD.
  • Left hemisphere dysfunction is associated with more severe arithmetic impairment than right hemisphere dysfunction.