Using Auditory Characteristics to Select Hearing Aid Compression Speeds for Presbycusic Patients

Area of Science:

• Audiology
• Hearing Science
• Biomedical Engineering

Background:

• Presbycusis, or age-related hearing loss, affects temporal processing and speech-in-noise perception.
• Hearing aid compression speeds, fast-acting compression (FAC) and slow-acting compression (SAC), influence auditory signal processing.
• Optimal selection of compression speeds is crucial for improving hearing aid efficacy in presbycusic individuals.

Purpose of the Study:

• To determine the optimal hearing aid compression speeds (fast-acting and slow-acting) for presbycusic patients.
• To evaluate the impact of compression speeds on temporal modulation perception and speech-in-noise performance.
• To identify auditory characteristics that predict the best compression speed for individual patients.

Main Methods:

• 24 patients with moderate sensorineural hearing loss participated.
• Electrocochleogram (ECochG) including action potentials (AP) and summating potentials (SP) were recorded.
• Temporal modulation thresholds and speech recognition in noise were measured under unaided, FAC, and SAC conditions.

Main Results:

• Slow-acting compression (SAC) better preserved modulation thresholds compared to fast-acting compression (FAC).
• Speech recognition thresholds (SRT75%) did not significantly differ between FAC and SAC conditions (p=0.12).
• A decision tree model using AP, unaided modulation thresholds, and unaided SRT75% predicted optimal compression speed with 90% accuracy.

Conclusions:

• Both FAC and SAC improved speech recognition in noise for presbycusic patients.
• SAC may be superior in preserving modulation thresholds compared to FAC.
• AP, unaided modulation thresholds, and unaided SRT75% can guide personalized hearing aid compression speed selection.