Stimulus and transducer effects on threshold.
Flamme GA; Geda K; McGregor KD; Wyllys K; Deiters KK; Murphy WJ; Stephenson MR
Int J Audiol 2015 Feb; 54(S1):S19-S29
Objective: This study examined differences in thresholds obtained under Sennheiser HDA200 circumaural earphones using pure tone, equivalent rectangular noise bands, and 1/3 octave noise bands relative to thresholds obtained using Telephonics TDH-39P supra-aural earphones. Design: Thresholds were obtained via each transducer and stimulus condition six times within a 10-day period. Study sample: Forty-nine adults were selected from a prior study to represent low, moderate, and high threshold reliability. Results: The results suggested that (1) only small adjustments were needed to reach equivalent TDH-39P thresholds, (2) pure-tone thresholds obtained with HDA200 circumaural earphones had reliability equal to or better than those obtained using TDH-39P earphones, (3) the reliability of noise-band thresholds improved with broader stimulus bandwidth and was either equal to or better than pure-tone thresholds, and (4) frequency-specificity declined with stimulus bandwidths greater than one equivalent rectangular band, which could complicate early detection of hearing changes that occur within a narrow frequency range. Conclusions: These data suggest that circumaural earphones such as the HDA200 headphones provide better reliability for audiometric testing as compared to the TDH-39P earphones. These data support the use of noise bands, preferably ERB noises, as stimuli for audiometric monitoring.
Hearing-acuity; Hearing-impairment; Hearing-loss; Hearing-tests; Audiometers; Audiological-testing; Noise-induced-hearing-loss; Humans; Equipment-reliability;
Author Keywords: Audiometry; noise-induced hearing loss; reliability; occupational health
Gregory A. Flamme, Department of Speech Pathology and Audiology, Western Michigan University, 1903 W. Michigan Ave., Kalamazoo, MI 49008
International Journal of Audiology