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Monopolar tDCS might affect brainstem reflexes: A computational and neurophysiological study.

Matteo Guidetti1, Anna Maria Bianchi2, Marta Parazzini3

  • 1"Aldo Ravelli" Center for Neurotechnology and Experimental Brain Therapeutics, Department of Health Sciences, University of Milan, Via Antonio di Rudinì 8, 20142 Milan, Italy; Department of Electronics, Information and Bioengineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milan, Italy.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|September 10, 2023
PubMed
Summary

Multi-electrode transcranial direct current stimulation (tDCS) can selectively modulate brainstem circuits. This non-invasive technique shows promise for deep brain stimulation by targeting specific neural pathways.

Keywords:
Blink ReflexComputational ModelMasseter Inhibitory ReflexNeuromodulationtDCS

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Neurophysiology

Background:

  • Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique.
  • Understanding the precise targeting capabilities of different tDCS montages is crucial for therapeutic applications.

Purpose of the Study:

  • To investigate if monopolar multi-electrode tDCS montages can selectively impact deep brain structures.
  • To combine computational modeling with neurophysiological assessments to evaluate tDCS effects.

Main Methods:

  • Computational models simulated electric field distribution for various tDCS montages, focusing on deep brain structures like the thalamus and midbrain.
  • Monopolar multi-electrode tDCS was applied to healthy participants.
  • Effects on brainstem circuits were assessed by measuring changes in blink reflex (BR) and masseter inhibitory reflex (MIR).

Main Results:

  • Computational models predicted that multi-electrode tDCS montages could generate electric field intensities in deep brain structures comparable to grey matter.
  • Neurophysiological data indicated that BR and MIR were selectively modulated by tDCS only when the cathode was positioned over the right deltoid.
  • This suggests a specific pathway for neuromodulation.

Conclusions:

  • Multi-electrode tDCS, with anodes on motor cortices and cathode on the right deltoid, can induce significant electric fields in the thalamus and midbrain.
  • This montage configuration allows for selective modulation of brainstem neural circuits.
  • Further research into multi-electrode tDCS for non-invasive deep brain stimulation is warranted.