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Reassessing lateralization in calculation.

Carlo Semenza1,2, Silvia Benavides-Varela2

  • 1Department of Neuroscience, University of Padova, via Giustiniani 5, 35128 Padova, Italy carlo.semenza@unipd.it.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|January 3, 2018
PubMed
Summary
This summary is machine-generated.

The right hemisphere plays a crucial, specific role in calculation, challenging previous views. Precise calculation requires coordinated function between both brain hemispheres.

Keywords:
acalculiacalculationdirect cortical electrostimulationneuropsychological investigationsright hemispheretranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Mathematics

Background:

  • The left hemisphere's role in calculation is well-established.
  • The right hemisphere's contribution to calculation has been historically underestimated and poorly defined.
  • Recent research suggests a more significant and specific role for the right hemisphere in numerical processing.

Purpose of the Study:

  • To investigate the specific contribution of the right hemisphere to calculation.
  • To re-evaluate the traditional understanding of right hemisphere functions in numerical tasks.
  • To explore the nature of interhemispheric communication in calculation.

Main Methods:

  • Review of recent clinical studies on acalculia.
  • Analysis of neuroimaging data.
  • Consideration of transcranial magnetic stimulation and direct cortical electro-stimulation findings.

Main Results:

  • Right hemisphere acalculia presents diverse symptoms not solely attributable to spatial deficits or general processing difficulties.
  • The right hemisphere possesses distinct functions essential for accurate calculation.
  • Bilateral hemispheric orchestration is vital for precise calculation.

Conclusions:

  • The traditional view of the right hemisphere's role in calculation, confined to spatial aspects, requires significant revision.
  • Future research should focus on defining the right hemisphere's specific calculational contributions and interhemispheric crosstalk.
  • Accurate calculation relies on the integrated function of both cerebral hemispheres.