Related Experiment Video
Updated: Oct 31, 2025
04:29
Vagus Nerve Stimulation As an Adjunctive Neurostimulation Tool in Treatment-resistant Depression
Published on: January 7, 2019
29.0K
Acute effect of vagus nerve stimulation (VNS) on brain function
Erhan Kavakbasi1, Joachim Gross2, Andreas Wollbrink2
1Department of Psychiatry, University Hospital Münster, University of Münster, Münster, Germany.
Journal of Psychiatric Research
|July 1, 2021
Summary
Vagus nerve stimulation (VNS) may treat depression by activating the cortex. This study observed a reduction in alpha brain waves after VNS treatment, suggesting a potential mechanism for VNS in managing depression.
Area of Science:
- Neuroscience
- Neuromodulation
- Psychiatry
Background:
- Vagus nerve stimulation (VNS) is a non-pharmacological neuromodulatory treatment for treatment-resistant depression.
- VNS involves a pulse generator connected to an electrode on the vagal nerve, presumed to modulate monoaminergic structures.
- Alpha oscillations are linked to depressive states and altered cortical activity.
Purpose of the Study:
- To investigate the effects of VNS on cortical activity using magnetoencephalography (MEG).
- To explore the potential mechanism of action for VNS in treating depression.
Main Methods:
- Magnetoencephalography (MEG) recordings were performed during active VNS in a patient with unipolar major depression.
- Analysis focused on changes in alpha oscillation amplitudes during and after VNS.
Main Results:
- MEG recordings were successful despite stimulation artifacts.
- A reproducible reduction in 10-Hz-alpha amplitude was observed in widespread cortical areas after VNS cessation.
- Alpha oscillations remained unaffected during VNS stimulation.
Conclusions:
- VNS may exert its antidepressant effects through cortical activation.
- The observed reduction in alpha amplitude post-stimulation suggests a potential mechanism for VNS in depression treatment.
