Exploring P300 Responses in Tinnitus: Linking Cognitive and Audiological Assessments

Area of Science:

• Audiology
• Neuroscience
• Cognitive Psychology

Background:

• Chronic tinnitus affects millions, often leading to significant distress and cognitive impairment.
• Tinnitus Retraining Therapy (TRT) is a treatment aimed at habituating patients to their tinnitus perception.
• Cognitive functioning, particularly attention and processing speed, can be negatively impacted by tinnitus.

Purpose of the Study:

• To evaluate the impact of tinnitus masking on cognitive functions.
• To assess the efficacy of Tinnitus Retraining Therapy (TRT) in reducing tinnitus handicap.
• To investigate changes in auditory cognitive processing using P300 event-related potentials.

Main Methods:

• A cohort of 15 subjects with unilateral chronic tinnitus and mild-to-moderate hearing loss participated.
• The study involved two phases: initial assessments (audiometry, P300, THI-Bangla) and a 60-session TRT intervention.
• Outcomes were measured by changes in P300 latency and amplitude, and Tinnitus Handicap Inventory (THI-Bangla) scores.

Main Results:

• Significant reductions in P300 latency and increases in P300 amplitude were observed post-TRT for both ears (p < 0.001).
• Tinnitus Handicap Inventory (THI-Bangla) scores decreased substantially (p < 0.001), indicating reduced tinnitus handicap.
• Post-therapy mean THI scores differed significantly between males and females (p = 0.033).

Conclusions:

• Tinnitus retraining therapy demonstrates significant efficacy in alleviating tinnitus-related distress.
• TRT enhances cognitive processing, as evidenced by objective improvements in P300 measures.
• The findings support TRT as a valuable therapeutic approach for individuals suffering from chronic tinnitus.