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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Altered functional connectivity strength between structurally and functionally affected brain regions in visual snow

Myrte Strik1,2,3, Meaghan J Clough4, Emma J Solly4

  • 1Spinoza Centre for Neuroimaging, Netherlands Institute for Neuroscience, Royal Netherlands Academy for Arts and Sciences (KNAW), 1105 BA Amsterdam, the Netherlands.

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|May 14, 2025
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Summary

Visual snow syndrome (VSS) involves altered brain connectivity, with VSS patients showing stronger connections between cortical areas and weaker connections with deep grey matter. These changes correlate with the perceived disruptiveness of VSS symptoms.

Keywords:
7TfMRIfunctional connectivityresting-state MRIvisual snow syndrome

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Area of Science:

  • Neurology
  • Neuroimaging
  • Neuroscience

Background:

  • Visual snow syndrome (VSS) is a neurological disorder characterized by persistent visual disturbances.
  • Previous research indicates structural and functional brain alterations in VSS patients.
  • Understanding functional connectivity is crucial for VSS pathophysiology.

Purpose of the Study:

  • To investigate resting-state functional connectivity between specific brain regions in VSS patients.
  • To explore the relationship between functional connectivity, VSS symptoms, and oculomotor measures.
  • To compare connectivity patterns in VSS patients with and without migraine.

Main Methods:

  • Utilized 7 Tesla MRI to acquire high-resolution resting-state functional and anatomical images.
  • Analyzed functional connectivity between predefined regions of interest in 40 VSS patients and 60 healthy controls.
  • Correlated connectivity metrics with VSS symptom severity, intensity, disruptiveness, and oculomotor performance.

Main Results:

  • VSS patients exhibited significantly higher connectivity between the supramarginal gyrus and lateral occipital cortex/fusiform gyrus.
  • Lower connectivity was observed between the supramarginal gyrus and pallidum, and parahippocampal gyrus and lateral occipital cortex.
  • Altered connectivity, particularly with the supramarginal gyrus, correlated with higher perceived disruptiveness of VSS.

Conclusions:

  • Individuals with VSS display altered functional brain connectivity, characterized by increased cortical connectivity and decreased connectivity with deep grey matter and temporal cortices.
  • These connectivity changes are associated with the subjective experience and disruptiveness of VSS.
  • No significant differences in connectivity were found between VSS patients with and without migraine.