Objective: Evaluate the conceptual framework that age effects on the electrophysiological binaural masking level difference (MLD) are partially mediated by age-related hearing loss and/or global cognitive function via mediation analysis.
Design: Participants underwent a series of audiometric tests. The MLD was measured via cortical auditory evoked potentials using a speech stimulus (/ɑ/) in speech-weighted background noise. We used mediation analyses to determine the total effect, natural direct effects, and natural indirect effects, which are displayed as regression coefficients ([95% CI]; value).
Study Sample: Twenty-eight individuals aged 19-87 years (mean [SD]: 53.3 [25.2]), recruited from the community.
Results: Older age had a significant total effect on the MLD (-0.69 [95% CI: -0.96, -0.45]; < 0.01). Neither pure tone average (-0.11 [95% CI: -0.43, 0.24; = 0.54] nor global cognitive function (-0.02 [95% CI: -0.13, 0.02]; = 0.55) mediated the relationship of age and the MLD and effect sizes were small. Results were insensitive to use of alternative hearing measures or inclusion of interaction terms.
Conclusions: The electrophysiological MLD may be an age-sensitive measure of binaural temporal processing that is minimally affected by age-related hearing loss and global cognitive function.
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