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Naunton's Masking Dilemma Revisited
Sheran Seneviratne1, Celene McNeill2,3, Simon L Greenberg4
1Department of Ear, Nose and Throat Surgery, St George Hospital, Kogarah.
Summary
Naunton's masking dilemma, a challenge in audiometry, can now be predicted using new mathematical formulas for air and bone conduction testing. These equations help identify when masking noise may inaccurately affect hearing threshold results.
Area of Science:
- Audiology
- Hearing Science
- Medical Diagnostics
Background:
- Pure-tone audiometry is crucial for diagnosing hearing loss.
- Masking the nontest ear is essential for accurate hearing threshold determination, especially with asymmetrical hearing or conductive loss.
- Naunton's masking dilemma, described by Ralph F. Naunton, occurs when masking noise in the nontest ear exceeds interaural attenuation, affecting the test ear.
Purpose of the Study:
- To derive mathematical formulas for predicting Naunton's masking dilemma in audiometric testing.
- To simplify the identification of conditions leading to over-masking during pure-tone audiometry.
Main Methods:
- A mathematical formula was derived to predict the occurrence of Naunton's masking dilemma.
- Existing literature on Naunton's masking dilemma and related publications were reviewed.
Main Results:
- Formulas were developed to predict Naunton's masking dilemma during air and bone conduction testing.
- For air conduction, the dilemma occurs when the sum of air/bone gaps is ≥ 2x interaural attenuation - 15 dB.
- For bone conduction, the dilemma occurs when the nontest ear's air-bone gap is ≥ interaural attenuation - 15 dB.
Conclusions:
- Naunton's masking dilemma presents a significant limitation in conventional audiometric evaluations.
- This study provides the first simplified mathematical equations to represent and predict Naunton's masking dilemma.