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Related Experiment Video

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Transcranial Direct Current Stimulation of the Dorsolateral Prefrontal Cortex Modulates Cognitive Function Related to

Satoshi Yamamoto1, Daisuke Ishii2,3, Kiyoshige Ishibashi4

  • 1Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, Ami, Japan.

Frontiers in Human Neuroscience
|July 1, 2022
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Summary

Transcranial direct current electrical stimulation (tDCS) of the left dorsolateral prefrontal cortex (DLPFC) improved cognitive decision-making in a sequential motor task. This finding suggests potential for tDCS in rehabilitation for motor execution deficits.

Keywords:
Stroop taskdorsolateral prefrontal cortexsequential tasksupervisory attention systemtranscranial direct current stimulation

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Cognitive Science

Background:

  • Sequential tasks and cognitive decisions are crucial for daily goal achievement.
  • Transcranial direct current electrical stimulation (tDCS) shows potential for modulating cognitive functions.
  • Investigating tDCS effects on motor execution and cognitive decision-making is relevant for rehabilitation.

Purpose of the Study:

  • To explore if tDCS of the left dorsolateral prefrontal cortex (DLPFC) enhances performance in a task combining motor actions and cognitive decisions.
  • To determine the specificity of tDCS effects on cognitive tasks versus pure dexterity tasks.

Main Methods:

  • Forty healthy participants were divided into real or sham tDCS groups.
  • Anodal tDCS was applied to the left DLPFC (F3) for 20 minutes at 1.5 mA.
  • Participants performed a sequential motor task with and without a decision-making component (S1 and S2) before and after stimulation.

Main Results:

  • Real tDCS significantly reduced S2 trajectory length compared to sham tDCS, indicating improved performance in the task requiring cognitive decisions.
  • No significant difference in S1 trajectory length was observed between real and sham tDCS groups, suggesting no improvement in pure dexterity.
  • A single tDCS session modulated cognitive aspects of motor execution.

Conclusions:

  • tDCS applied to the left DLPFC can enhance performance in tasks requiring cognitive decisions integrated with motor execution.
  • tDCS did not improve performance on tasks solely involving manual dexterity.
  • These findings support the potential application of tDCS as a novel rehabilitation strategy for patients with motor execution impairments.