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Changes in late-latency auditory evoked potentials after tinnitus suppression using auditory stimulation
Nastaran Ranjbar1, Ali Shahbazi2, Hossein Namvar Arefi3
1Department of Neuroscience, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran.
Brazilian Journal of Otorhinolaryngology
|November 5, 2022
Summary
Auditory stimulation, including Residual Inhibition (RI) and Tinnitus Masker (TM), effectively suppresses tinnitus by altering neural activity. This study observed significant changes in Late-Latency Auditory Evoked Potentials (LLAEPs) and behavioral assessments, confirming tinnitus relief.
Area of Science:
- Neuroscience
- Audiology
- Oto-neurology
Background:
- Tinnitus is often linked to auditory system reorganization and neural activity dysfunction.
- Auditory stimulation techniques like Residual Inhibition (RI) and Tinnitus Masker (TM) show potential for tinnitus alleviation.
- Investigating the neurophysiological underpinnings of tinnitus suppression is crucial for understanding treatment mechanisms.
Purpose of the Study:
- To investigate neurophysiological changes in Late-Latency Auditory Evoked Potentials (LLAEPs) following short-term (RI) and long-term (TM) auditory stimulation for tinnitus suppression.
- To assess the impact of these auditory interventions on tinnitus neural generators and their correlation with behavioral outcomes.
Main Methods:
- A comparative study involving 40 participants (20 tinnitus, 20 controls) with normal hearing.
- Late-Latency Auditory Evoked Potentials (LLAEPs) and Dichotic Digit Test (DDT) were recorded pre- and post-intervention.
- Tinnitus subjects underwent a 3-month Tinnitus Masker (TM) course, with Tinnitus Handicap Inventory (THI) assessed before and after.
Main Results:
- Tinnitus subjects exhibited prolonged N1, P3a, and P3b latencies and reduced P3a, P3b amplitudes at baseline compared to controls.
- Post-intervention LLAEPs showed significant increases in P3a amplitude and decreases in P3a latency in the tinnitus group.
- Significant improvements in DDT and THI scores were observed in the tinnitus group after TM therapy, alongside electrophysiological changes.
Conclusions:
- Short-term (RI) and long-term (TM) auditory stimulation induce neurophysiological changes in tinnitus patients, suggesting common suppression mechanisms.
- LLAEP alterations and behavioral improvements confirm the efficacy of auditory stimulation in tinnitus management.
- These findings highlight the role of neural plasticity in tinnitus suppression through auditory interventions.
