Sound therapy can modulate the functional connectivity of the auditory network

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Medical Imaging

Background:

• Tinnitus is often linked to altered functional connectivity within the auditory network.
• Sound therapy is a common and effective treatment for tinnitus, but its precise mechanisms require further elucidation.

Purpose of the Study:

• To investigate the impact of sound therapy on the functional connectivity of the auditory network in tinnitus patients.
• To explore the relationship between changes in auditory network connectivity and tinnitus symptom improvement.

Main Methods:

• Prospective observational study involving 27 tinnitus patients and 27 healthy controls.
• Resting-state functional magnetic resonance imaging (fMRI) acquired at baseline and after 12 weeks of sound therapy.
• Analysis using independent component analysis and seed-based functional connectivity to assess auditory network changes.

Main Results:

• Tinnitus patients exhibited increased functional connectivity in the left primary auditory cortex (PAC) and decreased connectivity in the secondary auditory cortex (SAC) after sound therapy.
• Sound therapy led to increased connectivity between the auditory network and the limbic network, and decreased connectivity with the bilateral thalami.
• Improvements in Tinnitus Handicap Inventory (THI) scores positively correlated with changes in functional connectivity between the SAC and bilateral thalami.

Conclusions:

• Sound therapy modulates functional connectivity within the auditory network in tinnitus patients.
• Observed changes suggest a potential gain adaptation mechanism and recovery of thalamic gating function in tinnitus patients treated with sound therapy.