Loudness functions for patients with functional hearing loss.

Area of Science:

• Audiology
• Neuroscience
• Psychophysics

Background:

• Functional hearing loss (FHL) is a complex condition.
• Understanding the perception of loudness in FHL is crucial for diagnosis and management.
• Loudness perception differs between sensorineural hearing loss (SNHL) and FHL.

Purpose of the Study:

• To compare loudness functions in patients with FHL, SNHL, and healthy controls.
• To investigate the relationship between sound level and perceived loudness in different hearing loss types.

Main Methods:

• Assessed loudness functions using categorical loudness scaling for a 1000 Hz tone.
• Included patients with FHL and SNHL, compared with healthy volunteers.
• Analyzed loudness ratings as a function of sound intensity.

Main Results:

• Healthy controls and SNHL patients showed progressive loudness increase with sound level.
• Approximately 70% of FHL patients exhibited atypical loudness functions.
• FHL patients often had lower loudness judgment thresholds or elevated loudness at the audiometric threshold.

Conclusions:

• Results support the hypothesis that FHL judgments are often based on a specific perceived loudness.
• This finding may aid in differentiating FHL from SNHL.
• Further research into FHL loudness perception is warranted.