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Related Experiment Video

Updated: Jan 21, 2026

Cochlear Surface Preparation in the Adult Mouse

Cochlear Surface Preparation in the Adult Mouse

Published on: November 6, 2019

Age Effects on Cochlear Reflectance in Adults.

Sara E Fultz¹, Kenneth I Vaden², Daniel M Rasetshwane¹

¹Center for Hearing Research, Boys Town National Research Hospital, Omaha, Nebraska, USA.

Ear and Hearing

|August 2, 2019

Summary

Age does not significantly impact cochlear reflectance (CR) in adults. Hearing sensitivity, not age, is the primary factor influencing CR signal magnitude and signal-to-noise ratio in adults.

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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

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Area of Science:

Audiology
Otoacoustic Emissions
Auditory Physiology

Background:

Cochlear reflectance (CR) quantifies the cochlea's contribution to ear-canal reflectance.
CR is an otoacoustic emission derived from the forward and reflected pressure transfer function.
Understanding CR's relationship with age and hearing is crucial for auditory health assessment.

Purpose of the Study:

To investigate the effects of aging on cochlear reflectance (CR) in adults.
To examine the interplay between age, sex, and hearing loss on CR.
To determine the primary drivers of variations in CR measures.

Main Methods:

Sixty adults across various age groups (20-79 years) with normal middle ear function participated.
Wideband noise stimuli at 30, 40, and 50 dB SPL were used to elicit CR.
CR signal magnitude (CRM), CR noise, and CR signal-to-noise ratio (CR-SNR) were analyzed across half-octave bands.

Main Results:

Increased age showed a trend towards lower CRM and CR-SNR, but these effects diminished upon accounting for hearing thresholds.
Elevated pure-tone thresholds were consistently linked to reduced CRM and CR-SNR across most frequencies and levels.
Hearing sensitivity significantly impacted CR measures even after controlling for age and sex.

Conclusions:

Hearing sensitivity is a more significant determinant of cochlear reflectance than chronological age in adults.
Better hearing sensitivity correlates with enhanced CRM and CR-SNR, independent of age.
Age-related changes in CR are largely explained by concurrent changes in hearing sensitivity.