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Magnetic vestibular stimulation modulates default mode network fluctuations.

Rainer Boegle1, Thomas Stephan2, Matthias Ertl3

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Magnetic vestibular stimulation (MVS) in MRI scanners causes nystagmus, affecting brain networks. This study shows MVS modulates the default mode network, impacting vestibular and ocular motor areas, crucial for accurate fMRI research.

Keywords:
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Area of Science:

  • Neuroimaging
  • Vestibular Neuroscience
  • Biophysics

Background:

  • Strong magnetic fields in MRI scanners can induce dizziness and nystagmus.
  • Magnetic Vestibular Stimulation (MVS) may influence functional Magnetic Resonance Imaging (fMRI) results due to vestibular system imbalance.
  • Nystagmus indicates vestibular dysfunction, potentially affecting brain activity via multisensory interactions.

Purpose of the Study:

  • To investigate if MVS modulates Blood-Oxygen-Level-Dependent (BOLD) signal fluctuations during resting-state fMRI.
  • To determine if MVS affects the default mode network (DMN) consistent with the Lorentz-force model.
  • To differentiate MVS effects from field-strength-related imaging artifacts.

Main Methods:

  • Recorded eye movements and resting-state fMRI in 30 volunteers at 1.5 T and 3.0 T in darkness.
  • Analyzed BOLD signal changes in relation to MVS and magnetic field strength.
  • Applied the Lorentz-force model to interpret MVS effects.

Main Results:

  • MVS modulated the DMN, primarily in areas linked to vestibular and ocular motor functions.
  • Observed signal modulation was consistent with the Lorentz-force model, exceeding expected field-strength scaling.
  • Distinguished MVS-induced network modulation from general imaging effects.

Conclusions:

  • MVS significantly influences resting-state fMRI BOLD signals, particularly in vestibular and ocular motor networks.
  • MVS effects must be considered to prevent biased results in fMRI studies, especially in vestibular research.
  • MVS presents a potential tool for manipulating brain network dynamics to study the brain as a dynamical system.