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STIMULUS AND TRANSDUCER EFFECTS ON THRESHOLD
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2 2015
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Source: Int J Audiol. 54(0 1):S19-S29
[PDF-1.09 MB]
Details:
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Alternative Title:Int J Audiol
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Personal Author:
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Description: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.
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Pubmed ID:25549164
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Pubmed Central ID:PMC4559258
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Volume:54
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