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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Altered Processing of Complex Visual Stimuli in Patients with Postconcussive Visual Motion Sensitivity.

J W Allen1,2,3, A Trofimova4, V Ahluwalia5

  • 1From the Department of Radiology and Imaging Sciences (J.W.A., A.T., J.L.S.), Emory University, Atlanta, Georgia jwallen@emory.edu.

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|February 12, 2021
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Summary
This summary is machine-generated.

Altered brain activity in visual-vestibular areas is linked to post-concussion visual motion sensitivity. This functional brain change correlates with symptom severity identified by Vestibular Ocular Motor Screening.

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Area of Science:

  • Neuroscience
  • Vestibular System Research
  • Functional Neuroimaging

Background:

  • Vestibular symptoms are frequent following concussions.
  • Post-concussive visual motion sensitivity is a recognized impairment.
  • Underlying brain alterations driving this sensitivity remain undefined.

Purpose of the Study:

  • To investigate functional brain alterations in multisensory processing related to post-concussive visual motion sensitivity.
  • To determine if these alterations are detectable using functional magnetic resonance imaging (fMRI).
  • To correlate brain activity with symptom severity.

Main Methods:

  • fMRI scans were conducted on patients with post-concussive visual motion sensitivity and healthy controls during a visual-vestibular paradigm.
  • Participants viewed neutral and provocative videos, reporting symptom intensity.
  • Vestibular Ocular Motor Screening (VOMS) scores were correlated with fMRI data.

Main Results:

  • Patients exhibited more VOMS abnormalities and increased symptoms with provocative stimuli.
  • Selective increased activation in visual-vestibular processing regions (e.g., vestibular cortex, inferior frontal gyrus) was observed in patients.
  • fMRI activation correlated with VOMS symptom severity in specific brain areas.

Conclusions:

  • Increased fMRI activation in visual-vestibular multisensory regions is characteristic of post-concussive visual motion sensitivity.
  • This heightened brain activity correlates with symptom severity.
  • Altered visual input weighting in the vestibular network may explain post-concussive visual motion sensitivity.