Reversing pathologically increased EEG power by acoustic coordinated reset neuromodulation.

Area of Science:

• Neuroscience
• Neuromodulation
• Audiology

Background:

• Tinnitus involves pathological neuronal synchronization, often reflected in abnormal brainwave activity.
• Acoustic Coordinated Reset (CR) therapy aims to desynchronize this activity using patterned auditory stimulation.
• Previous studies showed CR therapy improves tinnitus symptoms and alters brainwave power.

Purpose of the Study:

• To determine if CR therapy normalizes electroencephalographic (EEG) patterns in tinnitus patients towards physiological levels.
• To compare EEG data of tinnitus patients before and after CR therapy with healthy controls.
• To investigate the relationship between EEG power changes and tinnitus severity reduction.

Main Methods:

• Compared spontaneous EEG data from tinnitus patients (baseline and post-12 weeks CR therapy) with healthy controls.
• Utilized Brain Electrical Source Analysis (BESA) and standardized low-resolution brain electromagnetic tomography (sLORETA).
• Employed partial least squares analysis to correlate EEG power changes with clinical tinnitus scores.

Main Results:

• Acoustic CR neuromodulation normalized oscillatory power in tinnitus-related brain networks, particularly in temporal regions.
• Significant association found between reduced tinnitus severity and normalization of delta (δ) and gamma (γ) power.
• Normalization of EEG power was observed across widespread brain areas.

Conclusions:

• Acoustic CR neuromodulation normalizes brain EEG power, shifting it towards physiological patterns.
• The observed EEG normalization is significantly linked to a reduction in tinnitus severity.
• CR therapy offers a potential therapeutic strategy by restoring normal brain activity in tinnitus patients.