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The distressed brain: a group blind source separation analysis on tinnitus.

Dirk De Ridder1, Sven Vanneste, Marco Congedo

  • 1Brai2n, TRI & Department of Neurosurgery, Antwerp University Hospital, Antwerp, Belgium. dirk.de.ridder@uza.be

Plos One
|October 15, 2011
PubMed
Summary

Tinnitus distress is linked to specific brain activity patterns, particularly in the anterior cingulate cortex. These electroencephalography (EEG) findings reveal a distinct neural network associated with tinnitus-related suffering.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Tinnitus, the perception of sound without an external source, often causes significant distress.
  • The neural underpinnings of tinnitus-related distress are not fully understood.

Purpose of the Study:

  • To investigate the electroencephalography (EEG) correlates of tinnitus-related distress.
  • To identify specific brain activity patterns and networks associated with varying levels of tinnitus distress.

Main Methods:

  • Electroencephalography (EEG) was used to record resting-state brain activity in tinnitus patients with low and high distress, compared to controls.
  • Blind Source Separation (BSS) analysis was applied to a normative sample and the tinnitus group to identify brain components.
  • Functional connectivity analysis using lagged phase synchronization was performed on identified brain networks.

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Main Results:

  • Tinnitus can be characterized by at least four Blind Source Separation (BSS) components, including posterior cingulate, subgenual anterior cingulate, and parahippocampus.
  • Only the subgenual anterior cingulate component correlated with tinnitus-related distress.
  • Distress in tinnitus is associated with alpha and beta spectral changes in a network involving the anterior cingulate cortex, insula, and parahippocampus.

Conclusions:

  • Tinnitus distress is characterized by specific alterations in brain activity within a distinct neural network.
  • This network, involving the anterior cingulate cortex and related areas, may represent a general distress network implicated in other conditions.
  • EEG and BSS analysis offer valuable insights into the neurobiological basis of tinnitus-related distress.