The effect of masker type on the sensitivity of the digits in noise test for detecting hearing loss

Abstract

The Digits-in-Noise (DIN) test, a quick hearing-loss screening tool with high test-retest reliability and good sensitivity and specificity, can substitute for an audiogram when calibrated audiometry is unavailable. Traditionally, listeners hear three digits in speech-shaped noise, but other masker types might more effectively distinguish normal hearing thresholds (NHTs) from elevated hearing thresholds (EHTs). This study compared the ability of different energetic and informational maskers to detect low-frequency pure-tone averages >20 dB HL. First, DIN perception was adaptively measured (N = 1149 subjects) to determine the 80% correct speech-reception threshold (SRT80) for each of six masker types: female, male, and multi-gender multitalker babble; positive and negative Schroeder-phase complex tones; and speech-shaped noise. Then, for each masker type, a different group of subjects was tested at the corresponding SRT80. As expected, preliminary results suggest that a positive Schroeder-phase masker produces the greatest differences in DIN scores between NHTs and EHTs. Sensitivity and specificity rates for EHT detection for each masker, along with intersubject variability and order effects, will be explored. [The views expressed in this abstract are those of the authors and do not reflect the official policy of the Department of Army/Navy/Air Force, Department of Defense, or U.S. Government.]