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Electroencephalographic Patterns in taVNS: A Systematic Review.

Anna Carolyna L Gianlorenco1,2, Paulo S de Melo2,3, Anna Marduy2,4

  • 1Department of Physical Therapy, Federal University of Sao Carlos, Sao Carlos 13565-090, Brazil.

Biomedicines
|September 23, 2022
PubMed
Summary
This summary is machine-generated.

Transcutaneous auricular vagus nerve stimulation (taVNS) shows potential for therapeutic benefits. This review found taVNS may increase lower frequency EEG activity and alter early event-related potentials, suggesting EEG can monitor brain effects.

Keywords:
EEGbrain signalstaVNStranscutaneous vagus nerve stimulation

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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Biomedical Engineering

Background:

  • Transcutaneous auricular vagus nerve stimulation (taVNS) is an emerging non-invasive neuromodulation technique.
  • While clinical benefits are explored, the precise neurophysiological effects of taVNS on brain activity remain unclear.
  • Understanding these effects is crucial for developing taVNS into a reliable therapeutic tool.

Purpose of the Study:

  • To systematically review the effects of taVNS on electroencephalography (EEG) measures.
  • To identify taVNS parameters that may yield consistent EEG-mediated biomarkers.
  • To synthesize current evidence on taVNS-induced neurophysiological changes.

Main Methods:

  • Systematic literature review adhering to PRISMA and Cochrane guidelines.
  • Inclusion of clinical trials measuring EEG parameters like power spectrum, coherence, and event-related potentials (ERPs).
  • Analysis of 18 studies selected from 122 initial articles based on predefined criteria.

Main Results:

  • A general trend of increased EEG power spectrum activity in lower frequencies was observed.
  • Changes in early ERP components associated with inhibitory tasks were noted.
  • Quantitative EEG shows promise in assessing taVNS effects on brain activity.

Conclusions:

  • Quantitative EEG can be utilized to evaluate the neurophysiological impact of taVNS.
  • Further research is necessary to systematically define specific EEG metrics for taVNS.
  • Establishing reliable EEG biomarkers is key for optimizing taVNS therapy.