Electrophysiologic and Behavioral Masking Level Differences in Young and Older Listeners
1Graduate Institute of Audiology and Speech Therapy, Department of Special Education, National Kaohsiung Normal University, Taiwan.
Journal of Speech, Language, and Hearing Research : JSLHR
|December 4, 2025
Summary
Older adults show reduced auditory temporal processing, impacting speech understanding. The electrophysiologic masking level difference (eMLD) is more sensitive than behavioral tests for detecting age-related declines in auditory function.
Area of Science:
- Auditory Neuroscience
- Gerontology
- Speech and Hearing Sciences
Background:
- Age-related hearing loss (ARHL) affects many older adults, often leading to poor speech understanding.
- Deficits in auditory nerve synchrony may contribute to these difficulties.
- Traditional behavioral masking level difference (vMLD) tests have limitations in assessing neural function.
Purpose of the Study:
- To investigate age-related hearing loss (ARHL) by evaluating peripheral and central auditory processing.
- To compare the efficacy of behavioral masking level difference (vMLD) and electrophysiologic masking level difference (eMLD) in assessing temporal processing deficits.
- To determine the effects of age and hearing ability on auditory processing using both vMLD and eMLD.
Main Methods:
- Recruited four groups: young normal hearing, young simulated ARHL, older near-normal hearing, and older natural ARHL adults.
- Administered behavioral masking level difference (vMLD) tests using tone-in-noise paradigms.
- Measured electrophysiologic masking level difference (eMLD) using the auditory late latency response potential P2.
- Analyzed MLDs based on age, hearing status, and test methodology.
Main Results:
- All participants exhibited measurable MLDs across conditions.
- Younger groups demonstrated significantly larger MLDs than older groups.
- Older adults showed smaller eMLDs, indicating age-related decline in temporal processing.
- Age had a more pronounced effect on eMLD than ARHL, which showed minor contributions (~2 dB).
Conclusions:
- Auditory temporal processing, particularly the ability to process out-of-phase signals, declines with age.
- The electrophysiologic masking level difference (eMLD) is a more sensitive measure of temporal processing deficits in older adults compared to the behavioral masking level difference (vMLD).
- eMLD offers a valuable tool for understanding central auditory changes associated with aging and hearing loss.
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