Improving audibility with nonlinear amplification for listeners with high-frequency loss

Area of Science:

• Audiology
• Speech-Language Pathology
• Hearing Science

Background:

• Linear amplification fitting is well-researched for various hearing losses.
• Limited understanding exists regarding nonlinear amplification effects across different audiometric configurations.

Purpose of the Study:

• To compare speech recognition improvements from nonlinear amplification between listeners with sloping and flat sensorineural hearing loss.
• To assess if increased audibility with nonlinear amplification benefits both groups comparably.

Main Methods:

• Examined consonant recognition as a function of audibility.
• Utilized wide dynamic range compression (nonlinear) and linear amplification.
• Compared performance between listeners with flat and sloping sensorineural hearing loss.

Main Results:

• Linear amplification yielded similar recognition improvements for both flat and sloping loss groups with increased audibility.
• Nonlinear amplification showed a greater rate of improvement with audibility for the flat loss group compared to the sloping loss group.
• Sloping loss listeners performed better at low audibility levels with nonlinear amplification than expected based on overall group performance.

Conclusions:

• Nonlinear amplification's benefit in speech recognition varies with audiometric configuration.
• Listeners with flat hearing loss experience greater gains in speech recognition with increasing audibility under nonlinear amplification.
• The performance of sloping loss listeners with nonlinear amplification is influenced by their performance in low-audibility conditions.