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Related Experiment Video

Updated: May 10, 2026

Transcranial Direct Current Stimulation (tDCS) for Memory Enhancement
10:37

Transcranial Direct Current Stimulation (tDCS) for Memory Enhancement

Published on: September 18, 2021

Enhancing performance in numerical magnitude processing and mental arithmetic using transcranial Direct Current

Tobias U Hauser1, Stephanie Rotzer, Roland H Grabner

  • 1Division Neuropsychology, Institute of Psychology, University of Zurich Zurich, Switzerland ; University Clinics for Child and Adolescent Psychiatry, University of Zurich Zurich, Switzerland ; Neuroscience Center Zurich, University of Zurich and ETH Zurich Zurich, Switzerland.

Frontiers in Human Neuroscience
|June 14, 2013
PubMed
Summary

Left anodal transcranial Direct Current Stimulation (tDCS) improved numerical processing and mental arithmetic. This non-invasive brain stimulation technique shows promise for enhancing mathematical abilities in both healthy and impaired individuals.

Keywords:
mathematicsmental arithmeticnumber comparisonnumerical magnitude processingsubtractiontranscranial Direct Current Stimulation (tDCS)

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuromodulation

Background:

  • Accurate numerical processing and mental arithmetic are crucial for academic and professional success.
  • Impairments in these cognitive functions, such as in developmental dyscalculia, have limited remediation options.
  • Transcranial Direct Current Stimulation (tDCS) is an emerging non-invasive brain stimulation technique with potential therapeutic applications.

Purpose of the Study:

  • To investigate the efficacy of tDCS in enhancing numerical magnitude processing and mental arithmetic.
  • To determine the role of the posterior parietal cortex (PPC) in these cognitive functions.
  • To explore the effects of stimulating different hemispheres (left, right, bilateral) of the PPC.

Main Methods:

  • Two experiments were conducted using tDCS to stimulate the left, right, or both hemispheres of the PPC.
  • Participants performed number comparison and subtraction tasks to assess numerical magnitude processing and mental arithmetic.
  • Sham stimulation was used as a control condition.

Main Results:

  • Left anodal tDCS significantly improved performance on number comparison and subtraction tasks.
  • Bilateral and right anodal tDCS did not yield significant improvements compared to sham stimulation.
  • These findings suggest a causal role for the left PPC in numerical cognition.

Conclusions:

  • Left anodal tDCS can causally enhance numerical magnitude processing and mental arithmetic.
  • Non-invasive brain stimulation, specifically targeting the left PPC, offers a potential avenue for improving mathematical abilities.
  • Further research is warranted to explore tDCS applications in healthy and impaired populations for mathematical enhancement.