Cross-modality matching: a tool for measuring loudness in sensorineural impairment

Area of Science:

• Auditory perception research
• Clinical audiology
• Psychoacoustics

Background:

• Sensorineural hearing impairment significantly alters loudness perception.
• Accurate measurement of individual loudness functions is crucial for hearing aid fitting.
• Existing methods for assessing loudness growth may have limitations in clinical settings.

Purpose of the Study:

• To establish the viability of cross-modality matching (CMM) for measuring individual loudness functions in sensorineural hearing impairment.
• To rigorously assess CMM's internal consistency, relative variance, test-retest reliability, and data validity.

Main Methods:

• Magnitude scaling tasks involving perceived length and loudness were performed by 211 listeners (83 normal hearing, 128 cochlear impaired).
• Sensation-magnitude functions were generated using absolute magnitude estimation (AME), cross-modality matching (CMM), and absolute magnitude production (AMP).
• Data were analyzed to compare loudness growth rates and variability between normal and impaired hearing groups.

Main Results:

• CMM produced internally consistent loudness data in cochlear-impaired listeners.
• Loudness slopes were steeper in impaired hearing, and CMM results showed less variability than AME and AMP.
• Slope variability correlated with hearing loss severity; CMM demonstrated high test-retest reliability over time.
• Direct and indirect loudness matches showed close agreement, confirming CMM's validity.

Conclusions:

• Cross-modality matching (CMM) provides stable, accurate, and robust loudness growth measures in individuals with cochlear impairment.
• CMM's reliability, validity, and ease of use suggest its potential as a clinical tool for assessing loudness perception.
• Loudness-level functions from CMM can inform hearing aid frequency-gain response adjustments for optimal compensation.