Stimulus and transducer effects on threshold.
Stimulus and transducer effects on threshold.
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DOI：
10.3109/14992027.2014.979300
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发表时间：
2015-02
影响因子：
2.7
通讯作者：
Stephenson MR
中科院分区：
文献类型：
--
作者：
Flamme GA;Geda K;McGregor KD;Wyllys K;Deiters KK;Murphy WJ;Stephenson MR
这项研究测试了Sennheiser HDA200外耳机使用纯音、等效矩形噪声频段和1/3倍频程噪声频段获得的阈值与使用Telephonics TDH-39P上耳机获得的阈值的差异。在10天的时间内，通过每个传感器和刺激条件获得6次阈值。从先前的研究中选择了49名成年人，分别代表低、中、高阈值可靠性。结果表明：(1)只需很小的调整就能达到等效的TDH-39P听阈，(2)HDA200外耳机获得的纯音听阈的可靠性等于或好于使用TDH-39P耳机获得的听阈，(3)噪声频段听阈的可靠性随着刺激带宽的扩大而提高，等于或好于纯音听阈，以及(4)当刺激带宽大于一个等效矩形频段时，频率特异性下降，这将使在较窄频率范围内发生的听力变化的早期检测变得复杂。这些数据表明，与TDH-39P耳机相比，HDA200耳机等外耳式耳机在听力测试中提供了更好的可靠性。这些数据支持使用噪声频带，最好是ERB噪声，作为听力监测的刺激。
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. Thresholds were obtained via each transducer and stimulus condition six times within a 10-day period. Forty-nine adults were selected from a prior study to represent low, moderate, and high threshold reliability. 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. 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.