Bornstein S P, Musiek F E
Department of Communication Disorders, School of Health and Human Services, University of New Hampshire, Durham.
Scand Audiol. 1993;22(2):125-31. doi: 10.3109/01050399309046028.
Loudness discomfort levels (LDLs) for a 12-speaker babble were measured in 20 subjects with normal hearing sensitivity for two instructional sets, listening in the sound field. One instructional set asked the listener to indicate when they would choose 'not to listen for any period of time'. The second instructional set asked the listeners to indicate when they 'would choose not to listen for 15 minutes or longer'. A simple up-down adaptive procedure was used to measure LDLs. Data were gathered on both instructional sets for all listeners. LDLs for each instructional set were repeated on four separate occasions within a range of 1-3 weeks. The average LDLs for the instructions utilizing the criterion of choosing not to listen for any period of time were 9 dB higher than the criterion of choosing not to listen for 15 minutes or longer. The reliability of LDLs for both instructional sets was high, ranging from correlations of 0.90-0.97 for the criterion of choosing not to listen for any period of time, and ranging from correlations of 0.62-0.89 for the criterion of listening for 15 minutes or longer. The criterion of choosing not to listen for any period of time resulted in slightly more reliable measures. These results support the importance of considering the instructions given to a person to measure LDLs, and hence for where to set the saturation sound pressure level of a hearing aid. Also, with appropriate methods, LDLs can be reliably measured in the sound field.
在声场中，对20名听力敏感度正常的受试者，针对两种指导语设置，测量了12个扬声器发出的嘈杂声的响度不适阈（LDLs）。一种指导语设置要求听众指出他们何时会选择“在任何时间段都不听”。第二种指导语设置要求听众指出他们何时“会选择不听15分钟或更长时间”。采用简单的上下自适应程序来测量LDLs。收集了所有听众两种指导语设置下的数据。在1至3周的范围内，每个指导语设置的LDLs在四个不同场合重复测量。对于选择在任何时间段都不听的标准，其平均LDLs比选择不听15分钟或更长时间的标准高9分贝。两种指导语设置下LDLs的可靠性都很高，对于选择在任何时间段都不听的标准，相关性在0.90至0.97之间；对于选择听15分钟或更长时间的标准，相关性在0.62至0.89之间。选择在任何时间段都不听的标准产生的测量结果略更可靠。这些结果支持了在测量LDLs时考虑给予受试者的指导语的重要性，进而支持了确定助听器饱和声压级的重要性。此外，采用适当的方法，可以在声场中可靠地测量LDLs。
