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Auditory resting-state network connectivity in tinnitus: a functional MRI study.

Audrey Maudoux1, Philippe Lefebvre, Jean-Evrard Cabay

  • 1Coma Science Group, Cyclotron Research Centre, University of Liège, Liège, Belgium. amaudoux@doct.ulg.ac.be

Plos One
|May 11, 2012
PubMed
Summary

This study reveals altered brain connectivity in tinnitus patients, showing increased connections in non-auditory areas and decreased connections in auditory regions. These findings highlight widespread brain network changes in chronic tinnitus.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Auditory Neuroscience

Background:

  • The functional neuroanatomy of tinnitus is not well understood.
  • Limited research exists on functional brain connectivity changes in tinnitus patients.

Purpose of the Study:

  • To investigate differences in resting-state functional MRI connectivity within the auditory network between tinnitus patients and healthy controls.
  • To explore alterations in both auditory and extra-auditory brain regions associated with chronic tinnitus.

Main Methods:

  • Utilized resting-state functional MRI (fMRI) on 13 chronic tinnitus subjects and 15 age-matched healthy controls.
  • Employed independent component analysis (ICA) with automated component selection for connectivity analysis.
  • Analyzed connectivity patterns in cortical and subcortical brain regions.

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Main Results:

  • Tinnitus subjects exhibited increased functional connectivity in extra-auditory regions including the brainstem, basal ganglia, cerebellum, parahippocampal, prefrontal, parietal, and sensorimotor areas.
  • Decreased functional connectivity was observed in the right primary auditory cortex, left prefrontal cortex, left fusiform gyrus, and bilateral occipital regions in tinnitus patients.
  • Functional connectivity alterations spanned attentional, mnemonic, and emotional networks.

Conclusions:

  • Chronic tinnitus is associated with significant modifications in cortical and subcortical functional connectivity.
  • Non-auditory brain regions play a crucial role in tinnitus pathophysiology and the associated distress.
  • These widespread brain network changes contribute to the persistent awareness and disabling nature of chronic tinnitus.