Preference and Outcomes for Fast Versus Slow Compression in Hearing Aids for Older Adults: A Randomized Control...

Area of Science:

• Audiology
• Gerontology
• Hearing Science

Background:

• Hearing aid technology utilizes compression to manage sound dynamics.
• Compression speed (slow vs. fast-acting) is a key adjustable parameter.
• Understanding user preference for compression speed in aging adults is crucial for optimizing hearing aid fitting.

Purpose of the Study:

• To investigate older adults' preference for slow or fast-acting hearing aid compression.
• To determine if cognitive ability, hearing loss severity, or prior hearing aid experience influence this preference.
• To assess if compression speed affects reported benefit or speech recognition.

Main Methods:

• A single-blinded, crossover randomized controlled trial involving 56 participants aged 56-85 with mild-to-moderate hearing loss.
• Participants trialed hearing aids with slow and fast-acting compression for 2 months each.
• Outcomes included speech recognition (aided/unaided), cognitive tests, and self-reported hearing aid outcomes and preference.

Main Results:

• 77% of participants expressed a preference for either slow or fast-acting compression.
• Hearing threshold was the sole predictor of preference; greater hearing loss correlated with a preference for slower compression.
• Neither cognitive scores nor hearing aid experience predicted preference; objective speech recognition benefit was unaffected by compression speed.

Conclusions:

• Individuals with more severe hearing loss tend to prefer slow-acting compression.
• A hearing threshold of 35 dB HL effectively differentiates preference for fast versus slow compression.
• Setting compression speed based on hearing threshold (fast <35 dB HL, slow >35 dB HL) matched user preference in ~80% of cases.