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Transcranial direct current stimulation (tDCS) modulates motor execution in a limb reaching task.

Thomas Zandonai1,2, Matteo Bertucco3, Nadia Graziani3

  • 1Department of Pharmacology, Paediatrics and Organic Chemistry, Miguel Hernández University of Elche Alicante, Spain.

The European Journal of Neuroscience
|July 5, 2022
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Summary

Transcranial direct current stimulation (tDCS) impacts movement speed and accuracy. Anodal tDCS enhanced quick pointing actions, while cathodal tDCS impaired them, affecting the speed-accuracy trade-off.

Keywords:
brain stimulationlower limbmotor controlsupplementary motor area

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Analysis

Background:

  • Human motor control often involves a trade-off between movement speed and accuracy.
  • Understanding the neural mechanisms, particularly feedforward control, is crucial for optimizing movement.
  • Transcranial direct current stimulation (tDCS) offers a non-invasive method to modulate cortical excitability and investigate motor control.

Purpose of the Study:

  • To investigate the effects of anodal and cathodal transcranial direct current stimulation (tDCS) on the speed-accuracy trade-off in a quick pointing task.
  • To examine the role of the supplementary motor area (SMA) in the feedforward control of action.
  • To assess how different tDCS polarities influence movement kinematics.

Main Methods:

  • A single-blind crossover study involving 16 participants performing a quick pointing task with the big toe.
  • 20-minute application of 2mA tDCS to the supplementary motor area (SMA) in anodal, cathodal, and sham (control) conditions.
  • Movement kinematics (speed, accuracy, time) were recorded using an optoelectronic motion capture system before and after stimulation.

Main Results:

  • Anodal tDCS significantly decreased movement time and increased movement speed.
  • Cathodal tDCS resulted in increased movement time and decreased movement speed.
  • These findings suggest a direct modulation of the speed-accuracy trade-off by SMA stimulation.

Conclusions:

  • tDCS applied to the SMA can differentially modulate the speed-accuracy trade-off in voluntary movements.
  • Anodal stimulation appears to facilitate faster and more accurate movements, while cathodal stimulation has the opposite effect.
  • Further research is warranted to explore these effects, particularly in clinical populations exhibiting motor control deficits.