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Single-subject oscillatory γ responses in tinnitus.

William Sedley1, Sundeep Teki, Sukhbinder Kumar

  • 1Auditory Group, Institute of Neuroscience, Newcastle University Medical School, Framlington Place, Newcastle Upon Tyne NE2 4HH, UK. willsedley@gmail.com

Brain : a Journal of Neurology
|September 15, 2012
PubMed
Summary

This study investigated brain oscillations in chronic tinnitus patients. Gamma-band oscillations in the auditory cortex may help suppress tinnitus perception.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience

Background:

  • Chronic tinnitus is a prevalent auditory disorder.
  • The neural mechanisms underlying tinnitus perception remain incompletely understood.
  • Oscillatory activity in the brain is increasingly recognized as a potential biomarker for tinnitus.

Purpose of the Study:

  • To investigate the dynamic neural correlates of tinnitus intensity using magnetoencephalography (MEG).
  • To explore the role of auditory cortex oscillations in modulating tinnitus perception.
  • To propose a model for how cortical activity may attenuate phantom auditory perception.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity in 17 chronic tinnitus patients.
  • Residual inhibition and residual excitation techniques were employed to transiently alter tinnitus intensity.

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  • Correlations between tinnitus intensity and oscillatory power in various frequency bands (delta/theta, gamma) were analyzed.

    • Main Results:

    • Positive correlations between tinnitus intensity and delta/theta/gamma oscillations in the auditory cortex were observed during residual inhibition.
    • An inverse correlation between tinnitus intensity and auditory cortex gamma oscillations was found during residual excitation in all patients.
    • Significant oscillatory power changes were identified in the default mode network, cerebellum, insula, and anterior temporal lobe, showing patient-specific variability.

    Conclusions:

    • Auditory cortex gamma-band oscillations play a crucial role in modulating tinnitus perception.
    • A model is proposed where local circuit gamma-band oscillations function via mutual inhibition to suppress abnormal cortical activity.
    • Gamma-band oscillations in the auditory cortex are implicated as an intrinsic mechanism for attenuating phantom auditory perception in tinnitus.