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Hemispheric asymmetries in processing numerical meaning in arithmetic.

Selim Jang1, Daniel C Hyde1

  • 1Department of Psychology, University of Illinois at Urbana-Champaign, USA.

Neuropsychologia
|June 15, 2020
PubMed
Summary
This summary is machine-generated.

This study reveals distinct brain lateralization for numerical meaning and decision-making in arithmetic. Left hemisphere processing is key for numerical meaning, while the right hemisphere aids in decision-making accuracy.

Keywords:
ArithmeticCerebral hemispheresDistance effectLate positivityNumerical cognition

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience of Mathematics

Background:

  • Hemispheric asymmetries in arithmetic processing are debated.
  • Distinguishing arithmetic-specific asymmetries from general cognitive or linguistic factors is challenging.

Purpose of the Study:

  • To experimentally isolate numerical meaning processing in arithmetic from language and memory retrieval.
  • To investigate hemispheric differences in processing non-symbolic numerical information.

Main Methods:

  • Used non-symbolic addition problems with dot arrays.
  • Employed a visual half-field paradigm to present stimuli to specific hemispheres.
  • Recorded event-related potentials (ERP) to measure neural activity.

Main Results:

  • Neural sensitivity to numerical meaning occurred in the left visual field (left hemisphere) during early/middle late positive complex (LPC).
  • Decision-making accuracy was better with right visual field (right hemisphere) presentation.
  • Operational momentum signatures appeared later in the LPC, independent of visual field.

Conclusions:

  • Provides evidence for distinct timing and hemispheric lateralization in arithmetic processing.
  • Suggests a left hemisphere advantage for numerical meaning and a right hemisphere role in decision integration.
  • Highlights temporal and functional dissociation between magnitude and ordinal processing.